S06.A1 ICD-10-CM Code: Traumatic brain compression with herniation

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for S06.A1 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.A1 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
• 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.A1XA, S06.A1XD, S06.A1XS

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.A1

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

Before you code S06.A1

1. S06.A1 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

   ReviewS06.A1XA, S06.A1XD

   See the relationships section · Guide: How to choose an ICD-10-CM code →

2. A 7th character is required in this family. Confirm the documented encounter: initial (active treatment), subsequent (healing or recovery phase), or sequela. S06.A1 is not valid without one. “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.A1’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.A1. 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 documentation support one of the more specific codes beneath S06.A1?
   Yes → Select that code and continue the checks below on its own page.
   No → S06.A1 cannot be reported as written; query for the specificity its subcategory needs.

   ReviewS06.A1XA, S06.A1XD

2. Does the documentation support a condition named in S06.A1’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.

   ReviewS09.90

3. Is the underlying (etiologic) condition the Code First note names documented?
   Yes → Sequence the underlying condition first, then S06.A1.
   No → Continue; do not add an underlying condition the record does not document.

   ReviewS06.2, S06.3, S06.5, S06.6

4. 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.A1. 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 underlying (etiologic) condition

Named in the Code First note; sequenced before this code when documented (Guidelines I.A.13).

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).

Official instructions as workflow

• Excludes1 — check before selecting S06.A1(1 note)

  Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with S06.A1: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

  CompareS09.90

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

• Excludes2 — not part of S06.A1(9 notes)

  Coding workflow: The conditions named in this note are not included in S06.A1. 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

• Code First — sequencing check(5 notes)

  Coding workflow: Check whether the underlying or etiologic condition the note names is documented. When it is, sequence it before S06.A1. Do not add an underlying condition the record does not document.

  ReviewS06.2, S06.3, S06.5, S06.6

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

• Use Additional Code — after identifying S06.A1(1 note)

  Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with S06.A1 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

  ReviewF06.7

  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.

Indexed Clinical Terms (11)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

• Compression, brain (stem), due to, contusion (diffuse), focal, with herniation
• Compression, brain (stem), due to, contusion (diffuse), with herniation
• Compression, brain (stem), traumatic, with herniation
• Herniation, brain (stem), traumatic
• Herniation, brain (stem), traumatic, cerebellar
• Herniation, brain (stem), traumatic, subfalcine (cingulate)
• Herniation, brain (stem), traumatic, tonsillar
• Herniation, brain (stem), traumatic, transtentorial (central) (upward cerebellar)
• Herniation, brain (stem), traumatic, uncal
• Herniation, cerebral, traumatic
• Shift, midline, brain, traumatic, with herniation

Don’t confuse S06.A1 with…

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

The codes most likely to be picked instead of S06.A1 — 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.

• 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.A1 vs S09.90 →

• S06.A1XA— 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 initial encounter moves the case to S06.A1XA.

  Full comparison: S06.A1 vs S06.A1XA →

• S06.A1XD— 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.A1XD.

  Full comparison: S06.A1 vs S06.A1XD →

• 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.A1 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.A1 vs T32 →

• T16— 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 effects of foreign body in ear adds T16; it is not part of this code and both may be reported when both are documented.

  Full comparison: S06.A1 vs T16 →

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. Sequencing: 5 Code First instructions — the underlying condition is sequenced before this code when present. See the Code First notes
3. 1 Use Additional Code instruction — report the named additional code(s) when the documentation supports them. See the Use Additional Code notes
4. 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
5. 1 Excludes1 entry — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes
6. 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

• Not billable as written — a more specific code is required: S06.A1XA, S06.A1XD, S06.A1XS.
• Requires a 7th character. "The appropriate 7th character is to be added to each code from category S06, except as noted below" Options: S06.A1XA, S06.A1XD, S06.A1XS

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.A1 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.-), G93.5 — Compression of brain (via S06.A.-), 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.-), 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 5 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.-).

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 5 Use Additional Code instructions: S06.2 — Diffuse traumatic brain injury (via S06.A.-), S06.3 — Focal traumatic brain injury (via S06.A.-), S06.5 — Traumatic subdural hemorrhage (via S06.A.-), S06.6 — Traumatic subarachnoid hemorrhage (via S06.A.-), 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.

Related Codes

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Compression”, “Shift”, “Herniation”; these codes share that main term but sit in a different category of the Tabular List.

I77.4 — Celiac artery compression syndrome (celiac), I87.1 — Compression of vein (vein), I89.0 — Lymphedema, not elsewhere classified (lymphatic vessel), J38.00 — Paralysis of vocal cords and larynx, unspecified (laryngeal nerve, recurrent, with paralysis of vocal cords and larynx), J38.01 — Paralysis of vocal cords and larynx, unilateral (laryngeal nerve, recurrent, with paralysis of vocal cords and larynx, unilateral), J38.02 — Paralysis of vocal cords and larynx, bilateral (laryngeal nerve, recurrent, with paralysis of vocal cords and larynx, bilateral), J39.8 — Other specified diseases of upper respiratory tract (trachea), J98.09 — Other diseases of bronchus, not elsewhere classified (bronchus), J98.4 — Other disorders of lung (lung), J98.59 — Other diseases of mediastinum, not elsewhere classified (mediastinum), K22.2 — Esophageal obstruction (esophagus), N13.5 — Crossing vessel and stricture of ureter without hydronephrosis (ureter), O69.0 — Labor and delivery complicated by prolapse of cord (umbilical cord, complicating delivery, prolapse), O69.1 — Labor and delivery complicated by cord around neck, with compression (umbilical cord, complicating delivery, cord around neck), O69.2 — Labor and delivery complicated by other cord entanglement, with compression (umbilical cord, complicating delivery), P15.9 — Birth injury, unspecified (during birth), Q67.1 — Congenital compression facies (facies), R93.89 — Abnormal findings on diagnostic imaging of other specified body structures (mediastinal), T70.3 — Caisson disease [decompression sickness] (diver's squeeze), T79.5 — Traumatic anuria (syndrome), +21 more

Contextual Map

Every relationship of S06.A1 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.A1 with these 23 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
• G93.5 — Compression of brain[Excludes1](via S06.A.-): “traumatic compression of brain (S06.A-)”— 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
• 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

Referenced by Use Additional Code instructions

• S06.2 — Diffuse traumatic brain injury[Use Additional Code](via S06.A.-): “code, if applicable, for traumatic brain compression or herniation (S06.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S06.3 — Focal traumatic brain injury[Use Additional Code](via S06.A.-): “code, if applicable, for traumatic brain compression or herniation (S06.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S06.5 — Traumatic subdural hemorrhage[Use Additional Code](via S06.A.-): “code, if applicable, for traumatic brain compression or herniation (S06.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S06.6 — Traumatic subarachnoid hemorrhage[Use Additional Code](via S06.A.-): “code, if applicable, for traumatic brain compression or herniation (S06.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• 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

Index entries (11)

• Compression, brain (stem), due to, contusion (diffuse), focal, with herniation[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Compression, brain (stem), due to, contusion (diffuse), with herniation[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Compression, brain (stem), traumatic, with herniation[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Herniation, brain (stem), traumatic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Herniation, brain (stem), traumatic, cerebellar[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Herniation, brain (stem), traumatic, subfalcine (cingulate)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Herniation, brain (stem), traumatic, tonsillar[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Herniation, brain (stem), traumatic, transtentorial (central) (upward cerebellar)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• and 3 more

Nearest codes (40)

• S06 — Intracranial injury[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.9X2 — Unspecified intracranial injury with loss of consciousness of 31 minutes to 59 minutes[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.9X2A — Unspecified intracranial injury with loss of consciousness of 31 minutes to 59 minutes, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.9X2D — Unspecified intracranial injury with loss of consciousness of 31 minutes to 59 minutes, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.9X2S — Unspecified intracranial injury with loss of consciousness of 31 minutes to 59 minutes, sequela[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.9X3 — Unspecified intracranial injury with loss of consciousness of 1 hour to 5 hours 59 minutes[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.9X3A — Unspecified intracranial injury with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S06.9X3D — Unspecified intracranial injury with loss of consciousness of 1 hour to 5 hours 59 minutes, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 32 more

Change history

• FY2022 — Added to the code set[Change history]— CMS release files (code change ledger) · icd10cm-fy2022

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

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.A1 in its code family, with their registry titles.

• S06.9XAA — Unspecified intracranial injury with loss of consciousness status unknown, initial encounter
• S06.9XAD — Unspecified intracranial injury with loss of consciousness status unknown, subsequent encounter
• S06.9XAS — Unspecified intracranial injury with loss of consciousness status unknown, sequela
• S06.A — Traumatic brain compression and herniation
• S06.A0 — Traumatic brain compression without herniation
• S06.A0XA — Traumatic brain compression without herniation, initial encounter
• S06.A0XD — Traumatic brain compression without herniation, subsequent encounter
• S06.A0XS — Traumatic brain compression without herniation, sequela
• S06.A1XA — Traumatic brain compression with herniation, initial encounter
• S06.A1XD — Traumatic brain compression with herniation, subsequent encounter

View all codes in the S06 family