S06.2X9A ICD-10-CM Code: Diffuse traumatic brain injury with loss of consciousness of unspecified duration, initial encounter

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for S06.2X9A in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on S06.2X9A itself; “inherited from” names the category or block whose note applies here.

7th Character Guide

"The appropriate 7th character is to be added to each code from category S06, except as noted below"

• A — initial encounter (this page’s code)
• D — subsequent encounter
• S — sequela

How the encounter character is assigned. “Initial encounter” means the patient is receiving active treatment for the condition — it is not limited to the first visit, and a different or new provider giving active treatment still assigns it. “Subsequent encounter” covers care during the healing or recovery phase after active treatment. “Sequela” is for complications or conditions that arise as a direct result of the original condition.

ICD-10-CM Official Guidelines for Coding and Reporting, Section I.C.19.a (paraphrased by MedCoder).

Variant codes in this family

S06.2X9A, S06.2X9D, S06.2X9S

Character meanings are CMS's official 7th-character extensions for this family, as carried in each variant code's official description; variant codes are registry rows. The explanation of how the encounter character is assigned is MedCoder editorial, distinct from the official content above it.

Coder workflow for S06.2X9A

MedCoder structured workflow — derived from this code’s own official record

Before you code S06.2X9A

1. Unspecified does not mean incorrect. When the record gives no greater specificity, S06.2X9A may be the appropriate code. Check the record for detail that supports a more specific sibling — in this subcategory the siblings differ by the presence or absence of the associated condition. An unspecified code is for records that do not provide the detail a more specific code needs; a query, not an assumption, is the route to specificity (Guidelines I.A.9.b, I.B.18).

   ReviewS06.2X3A, S06.2X4A, S06.2X5A, S06.2X6A, S06.2X7A, S06.2X8A, S06.2XAA

   See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

2. A 7th character is required in this family. Confirm the documented encounter: initial (active treatment), subsequent (healing or recovery phase), or sequela. This page’s code carries “A”. “Initial” means active treatment, not the first visit (Guidelines I.C.19.a).

   See the 7th Character Guide · Guide: 7th characters: initial, subsequent, sequela →

3. S06.2X9A’s title joins a condition with an associated condition or complication. Confirm each component is documented. Where the classification presumes the link through the “with” convention, only a provider statement that the conditions are unrelated defeats it. A combination code is assigned only when it fully identifies the documented conditions; a required second code for the stage, type or manifestation is still reported when the notes ask for it (Guidelines I.B.9, I.A.15).

   Guide: Combination codes →

4. Confirm the injury type, the anatomical site at the most specific level documented, laterality where the family codes it, and the encounter for the 7th character. Each injury is coded separately unless the classification provides a combination code, and a superficial injury is not coded when a more severe injury of the same site is documented. Injury chapter guidelines (Guidelines I.C.19.b, I.C.19.b.1).

   Guide: 7th characters: initial, subsequent, sequela →

5. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with S06.2X9A. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

   See the official tabular notes

Choose the right path

1. Does the record document the detail a more specific sibling code needs?
   Yes → Review the specific siblings in this subcategory.
   No → Continue — S06.2X9A is appropriate when the documentation goes no further.

   ReviewS06.2X3A, S06.2X4A, S06.2X5A, S06.2X6A, S06.2X7A, S06.2X8A, S06.2XAA

2. Does the documentation support a condition named in S06.2X9A’s Excludes1 note?
   Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
   No → Continue.

   ReviewS06.1X, S09.90

3. Is the encounter phase documented — active treatment, healing or recovery, or a sequela?
   Yes → Assign the matching 7th character; the variant codes are in the 7th Character Guide.
   No → The code is invalid without its 7th character — query for the missing element.

Consider S06.2X9A. Then work the Use Additional Code note and review the Code Also note, and confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement

Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

Anatomical site

At the most specific level the record states; a site the classification separates cannot be assumed from a procedure or a measurement.

Encounter type

Active treatment, healing or recovery phase, or sequela — the basis of the 7th character (Guidelines I.C.19.a).

The associated condition or complication

Whether the associated condition the title names is documented; the “with” convention presumes some links, and a provider statement that the conditions are unrelated defeats it (Guidelines I.A.15).

The conditions the Use Additional Code note names

Reported with this code when documented; a conditional instruction (“if applicable”, “if known”) applies only when the record supports it.

External cause, place and activity

For the external cause codes reported with the injury or poisoning, where documented (Guidelines I.C.20.a).

Any detail beyond this code’s title

What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

• Excludes1 — check before selecting S06.2X9A(2 notes)

  Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with S06.2X9A: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

  CompareS06.1X, S09.90

  See the official tabular notes · Guidelines I.A.12.a

• Excludes2 — not part of S06.2X9A(9 notes)

  Coding workflow: The conditions named in this note are not included in S06.2X9A. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareT16, T17.3, T18.0, T17.2, T15, T63.4

  See the official tabular notes · Guidelines I.A.12.b

• Use Additional Code — after identifying S06.2X9A(2 notes)

  Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with S06.2X9A when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

  ReviewS06.A, F06.7

  See the official tabular notes · Guidelines I.A.13

• Code Also — related condition(4 notes)

  Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

  ReviewS01, S02

  See the official tabular notes · Guidelines I.A.17

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse S06.2X9A with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of S06.2X9A — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

• S06.1X— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of traumatic diffuse cerebral edema moves the case to S06.1X; the two are not reported together unless documented as unrelated.

  Full comparison: S06.2X9A vs S06.1X →

• S09.90— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of head injury NOS moves the case to S09.90; the two are not reported together unless documented as unrelated.

  Full comparison: S06.2X9A vs S09.90 →

• S06.2X9D— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

  The same diagnosis at a different phase of care; one encounter takes one 7th character.

  What moves you there: Documentation of a subsequent encounter moves the case to S06.2X9D.

  Full comparison: S06.2X9A vs S06.2X9D →

• S06.2X9S— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

  The same diagnosis at a different phase of care; one encounter takes one 7th character.

  What moves you there: Documentation of a sequela moves the case to S06.2X9S.

  Full comparison: S06.2X9A vs S06.2X9S →

• T20— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of burns and corrosions adds T20; it is not part of this code and both may be reported when both are documented.

  Full comparison: S06.2X9A vs T20 →

• T32— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of burns and corrosions adds T32; it is not part of this code and both may be reported when both are documented.

  Full comparison: S06.2X9A vs T32 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

1. A 7th character applies in this family. Confirm the documented encounter matches the character assigned. See the official 7th-character definitions and this code’s variants
2. 2 Use Additional Code instructions — report the named additional code(s) when the documentation supports them. See the Use Additional Code notes
3. 4 Code Also notes — a second code may apply; the guidelines leave its sequencing to the circumstances of the encounter. See the Code Also notes
4. 2 Excludes1 entries — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes
5. 9 Excludes2 entries — those conditions are not part of this code and may be reported additionally when documented. See the Excludes2 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

• CC as a secondary diagnosis (FY2026). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name S06.2X9A or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 14 Excludes1 notes across 4 chapters: G31.84 — Mild cognitive impairment of uncertain or unknown etiology (via S06.-), I60 — Nontraumatic subarachnoid hemorrhage (via S06.-), I60-I69 — Cerebrovascular diseases (I60-I69) (via S06.-), I61 — Nontraumatic intracerebral hemorrhage (via S06.-), I62 — Other and unspecified nontraumatic intracranial hemorrhage (via S06.-), I63 — Cerebral infarction (via S06.-), I65 — Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction (via S06.-), I66 — Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction (via S06.-), I67 — Other cerebrovascular diseases (via S06.-), I68 — Cerebrovascular disorders in diseases classified elsewhere (via S06.-), I69 — Sequelae of cerebrovascular disease (via S06.-), P52 — Intracranial nontraumatic hemorrhage of newborn (via S06.-), S00 — Superficial injury of head (via S06.2.-), S09.0 — Injury of blood vessels of head, not elsewhere classified (via S06.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 6 Code First instructions across 3 chapters: F02 — Dementia in other diseases classified elsewhere (via S06.-), F06.7 — Mild neurocognitive disorder due to known physiological condition (via S06.-), F48.2 — Pseudobulbar affect (via S06.-), R40.2 — Coma (via S06.-), S04 — Injury of cranial nerve (via S06.-), S06.A — Traumatic brain compression and herniation (via S06.2.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Referenced by 1 Use Additional Code instruction: S07 — Crushing injury of head (via S06.-).

These codes instruct coders to additionally report this code when it applies.

Referenced by 5 Code Also instructions across 2 chapters: G96.00 — Cerebrospinal fluid leak, unspecified (via S06.-), G96.08 — Other cranial cerebrospinal fluid leak (via S06.-), G96.09 — Other spinal cerebrospinal fluid leak (via S06.-), S01 — Open wound of head (via S06.-), S02 — Fracture of skull and facial bones (via S06.-).

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 383 clinically related codes on its CMS exclusion list. Does not count toward severity when the stay groups to DRGs 082-084 (Traumatic Stupor and Coma >1 Hour); DRGs 957-959 (Other O.R. Procedures for Multiple Significant Trauma); DRGs 963-965 (Other Multiple Significant Trauma).

Named in the grouper logic of 6 MS-DRGs: DRG 082 (MDC 01), DRG 083 (MDC 01), DRG 084 (MDC 01), DRG 963 (MDC 24), DRG 964 (MDC 24), DRG 965 (MDC 24).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):INJ008 — Traumatic brain injury (TBI); concussion, initial encounter (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same injury, other encounter phase

Same injury, coded at a different phase of treatment via the 7th character.

S06.2X9D — Diffuse traumatic brain injury with loss of consciousness of unspecified duration, subsequent encounterCompare S06.2X9A vs S06.2X9D →, S06.2X9S — Diffuse traumatic brain injury with loss of consciousness of unspecified duration, sequelaCompare S06.2X9A vs S06.2X9S →

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Major Head Injury with Loss of Consciousness < 1 Hour or Unspecified) for risk-adjusted payment.

S06.1X1A — Traumatic cerebral edema with loss of consciousness of 30 minutes or less, initial encounter, S06.1X2A — Traumatic cerebral edema with loss of consciousness of 31 minutes to 59 minutes, initial encounter, S06.1X9A — Traumatic cerebral edema with loss of consciousness of unspecified duration, initial encounter, S06.2X1A — Diffuse traumatic brain injury with loss of consciousness of 30 minutes or less, initial encounter, S06.2X2A — Diffuse traumatic brain injury with loss of consciousness of 31 minutes to 59 minutes, initial encounter, S06.301A — Unspecified focal traumatic brain injury with loss of consciousness of 30 minutes or less, initial encounter, S06.302A — Unspecified focal traumatic brain injury with loss of consciousness of 31 minutes to 59 minutes, initial encounter, S06.309A — Unspecified focal traumatic brain injury with loss of consciousness of unspecified duration, initial encounter, S06.311A — Contusion and laceration of right cerebrum with loss of consciousness of 30 minutes or less, initial encounter, S06.312A — Contusion and laceration of right cerebrum with loss of consciousness of 31 minutes to 59 minutes, initial encounter, S06.319A — Contusion and laceration of right cerebrum with loss of consciousness of unspecified duration, initial encounter, S06.321A — Contusion and laceration of left cerebrum with loss of consciousness of 30 minutes or less, initial encounter, S06.322A — Contusion and laceration of left cerebrum with loss of consciousness of 31 minutes to 59 minutes, initial encounter, S06.329A — Contusion and laceration of left cerebrum with loss of consciousness of unspecified duration, initial encounter, S06.331A — Contusion and laceration of cerebrum, unspecified, with loss of consciousness of 30 minutes or less, initial encounter, S06.332A — Contusion and laceration of cerebrum, unspecified, with loss of consciousness of 31 minutes to 59 minutes, initial encounter, S06.339A — Contusion and laceration of cerebrum, unspecified, with loss of consciousness of unspecified duration, initial encounter, S06.341A — Traumatic hemorrhage of right cerebrum with loss of consciousness of 30 minutes or less, initial encounter, S06.342A — Traumatic hemorrhage of right cerebrum with loss of consciousness of 31 minutes to 59 minutes, initial encounter, S06.349A — Traumatic hemorrhage of right cerebrum with loss of consciousness of unspecified duration, initial encounter, +36 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Major Head Injury with Loss of Consciousness > 1 Hour, Coma, Brain Compression/Anoxic Damage, Major Head Injury without Loss of Consciousness

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Traumatic brain injury (TBI); concussion, initial encounter).

S06.1XAA — Traumatic cerebral edema with loss of consciousness status unknown, initial encounter, S06.2X0A — Diffuse traumatic brain injury without loss of consciousness, initial encounter, S06.2X1A — Diffuse traumatic brain injury with loss of consciousness of 30 minutes or less, initial encounter, S06.2X2A — Diffuse traumatic brain injury with loss of consciousness of 31 minutes to 59 minutes, initial encounter, S06.2X3A — Diffuse traumatic brain injury with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter, S06.2X4A — Diffuse traumatic brain injury with loss of consciousness of 6 hours to 24 hours, initial encounter, S06.2X5A — Diffuse traumatic brain injury with loss of consciousness greater than 24 hours with return to pre-existing conscious levels, initial encounter, S06.2X6A — Diffuse traumatic brain injury with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter, S06.2X7A — Diffuse traumatic brain injury with loss of consciousness of any duration with death due to brain injury prior to regaining consciousness, initial encounter, S06.2X8A — Diffuse traumatic brain injury with loss of consciousness of any duration with death due to other cause prior to regaining consciousness, initial encounter, S06.2XAA — Diffuse traumatic brain injury with loss of consciousness status unknown, initial encounter, S06.300A — Unspecified focal traumatic brain injury without loss of consciousness, initial encounter, S06.301A — Unspecified focal traumatic brain injury with loss of consciousness of 30 minutes or less, initial encounter, S06.302A — Unspecified focal traumatic brain injury with loss of consciousness of 31 minutes to 59 minutes, initial encounter, S06.303A — Unspecified focal traumatic brain injury with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter, S06.304A — Unspecified focal traumatic brain injury with loss of consciousness of 6 hours to 24 hours, initial encounter, S06.305A — Unspecified focal traumatic brain injury with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter, S06.306A — Unspecified focal traumatic brain injury with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter, S06.307A — Unspecified focal traumatic brain injury with loss of consciousness of any duration with death due to brain injury prior to regaining consciousness, initial encounter, S06.308A — Unspecified focal traumatic brain injury with loss of consciousness of any duration with death due to other cause prior to regaining consciousness, initial encounter, +194 more

Contextual Map

Every relationship of S06.2X9A in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run S06.2X9A with these 20 related codes in Claim Check

Hierarchy

• S00-T88 — Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) (S00-T88)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S00-S09 — Injuries to the head[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Excludes1 notes (14)

• G31.84 — Mild cognitive impairment of uncertain or unknown etiology[Excludes1](via S06.-): “cognitive impairment due to intracranial or head injury (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I60 — Nontraumatic subarachnoid hemorrhage[Excludes1](via S06.-): “traumatic intracranial hemorrhage (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I60-I69 — Cerebrovascular diseases (I60-I69)[Excludes1](via S06.-): “traumatic intracranial hemorrhage (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I61 — Nontraumatic intracerebral hemorrhage[Excludes1](via S06.-): “traumatic intracranial hemorrhage (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I62 — Other and unspecified nontraumatic intracranial hemorrhage[Excludes1](via S06.-): “traumatic intracranial hemorrhage (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I63 — Cerebral infarction[Excludes1](via S06.-): “traumatic intracranial hemorrhage (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I65 — Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction[Excludes1](via S06.-): “traumatic intracranial hemorrhage (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I66 — Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction[Excludes1](via S06.-): “traumatic intracranial hemorrhage (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• and 6 more

Referenced by Code First instructions

• F02 — Dementia in other diseases classified elsewhere[Code First](via S06.-): “traumatic brain injury (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• F06.7 — Mild neurocognitive disorder due to known physiological condition[Code First](via S06.-): “traumatic brain injury (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• F48.2 — Pseudobulbar affect[Code First](via S06.-): “sequelae of traumatic intracranial injury (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• R40.2 — Coma[Code First](via S06.-): “intracranial injury (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S04 — Injury of cranial nerve[Code First](via S06.-): “any associated intracranial injury (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S06.A — Traumatic brain compression and herniation[Code First](via S06.2.-): “diffuse traumatic brain injury (S06.2-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Use Additional Code instructions

• S07 — Crushing injury of head[Use Additional Code](via S06.-): “intracranial injuries (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code Also instructions

• G96.00 — Cerebrospinal fluid leak, unspecified[Code Also](via S06.-): “head injury (S00-S09)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• G96.08 — Other cranial cerebrospinal fluid leak[Code Also](via S06.-): “head injury (S00 - S09)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• G96.09 — Other spinal cerebrospinal fluid leak[Code Also](via S06.-): “head injury (S00 - S09)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S01 — Open wound of head[Code Also](via S06.-): “intracranial injury (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S02 — Fracture of skull and facial bones[Code Also](via S06.-): “any associated intracranial injury (S06.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

• INJ008 — Traumatic brain injury (TBI); concussion, initial encounter[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

Risk adjustment (CMS-HCC)

• HCC 398 — Major Head Injury with Loss of Consciousness < 1 Hour or Unspecified [CMS-HCC]: “Major Head Injury with Loss of Consciousness < 1 Hour or Unspecified — supersedes HCC 202 (Coma, Brain Compression/Anoxic Damage), HCC 399 (Major Head Injury without Loss of Consciousness)”— CMS-HCC V28 · 2026

MS-DRG Grouper

• CC — Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (CC). Not counted when the stay groups to DRGs 082-084 (Traumatic Stupor and Coma >1 Hour); DRGs 957-959 (Other O.R. Procedures for Multiple Significant Trauma); DRGs 963-965 (Other Multiple Significant Trauma).”— CMS MS-DRG Definitions Manual (Appendix C) · FY2026
• DRG 082 — TRAUMATIC STUPOR AND COMA >1 HOUR WITH MCC[MS-DRG]: “TRAUMATIC STUPOR AND COMA >1 HOUR WITH MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 083 — TRAUMATIC STUPOR AND COMA >1 HOUR WITH CC[MS-DRG]: “TRAUMATIC STUPOR AND COMA >1 HOUR WITH CC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 084 — TRAUMATIC STUPOR AND COMA >1 HOUR WITHOUT CC/MCC[MS-DRG]: “TRAUMATIC STUPOR AND COMA >1 HOUR WITHOUT CC/MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 963 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITH MCC[MS-DRG]: “OTHER MULTIPLE SIGNIFICANT TRAUMA WITH MCC (MDC 24)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 964 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITH CC[MS-DRG]: “OTHER MULTIPLE SIGNIFICANT TRAUMA WITH CC (MDC 24)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 965 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITHOUT CC/MCC[MS-DRG]: “OTHER MULTIPLE SIGNIFICANT TRAUMA WITHOUT CC/MCC (MDC 24)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 01 — Diseases and Disorders of the Nervous System[MDC crossing]: “Diseases and Disorders of the Nervous System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 8,892 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026
• MDC 24 — Multiple Significant Trauma[MDC crossing]: “Multiple Significant Trauma — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 22,957 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Nearest codes (40)

• S06 — Intracranial injury[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.2X3A — Diffuse traumatic brain injury with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.2X3D — Diffuse traumatic brain injury with loss of consciousness of 1 hour to 5 hours 59 minutes, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.2X3S — Diffuse traumatic brain injury with loss of consciousness of 1 hour to 5 hours 59 minutes, sequela[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.2X4 — Diffuse traumatic brain injury with loss of consciousness of 6 hours to 24 hours[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.2X4A — Diffuse traumatic brain injury with loss of consciousness of 6 hours to 24 hours, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.2X4D — Diffuse traumatic brain injury with loss of consciousness of 6 hours to 24 hours, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.2X4S — Diffuse traumatic brain injury with loss of consciousness of 6 hours to 24 hours, sequela[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 32 more

Change history

• FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Common coding questions

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data

CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page

Inpatient payment groups Official source data

CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page

Risk adjustment Official source data

2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release Release, file and checksum · Publisher’s page

Change history and date-of-service validity Official source data

CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page

Comparisons, relationships and the contextual map MedCoder structured relationship

Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

Summary and FAQ answers MedCoder explanation

Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to S06.2X9A in its code family, with their registry titles.

• S06.2X7 — Diffuse traumatic brain injury with loss of consciousness of any duration with death due to brain injury prior to regaining consciousness
• S06.2X7A — Diffuse traumatic brain injury with loss of consciousness of any duration with death due to brain injury prior to regaining consciousness, initial encounter
• S06.2X8 — Diffuse traumatic brain injury with loss of consciousness of any duration with death due to other cause prior to regaining consciousness
• S06.2X8A — Diffuse traumatic brain injury with loss of consciousness of any duration with death due to other cause prior to regaining consciousness, initial encounter
• S06.2X9 — Diffuse traumatic brain injury with loss of consciousness of unspecified duration
• S06.2X9D — Diffuse traumatic brain injury with loss of consciousness of unspecified duration, subsequent encounter
• S06.2X9S — Diffuse traumatic brain injury with loss of consciousness of unspecified duration, sequela
• S06.2XA — Diffuse traumatic brain injury with loss of consciousness status unknown
• S06.2XAA — Diffuse traumatic brain injury with loss of consciousness status unknown, initial encounter
• S06.2XAD — Diffuse traumatic brain injury with loss of consciousness status unknown, subsequent encounter

View all codes in the S06 family