S12.8XXA ICD-10-CM Code: Fracture of other parts of neck, initial encounter

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for S12.8XXA in the official ICD-10-CM tabular list, quoted as published.

Notes without a marker are published on S12.8XXA itself; “inherited from” names the category or block whose note applies here.

7th Character Guide

"The appropriate 7th character is to be added to code S12.8"

• 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

S12.8XXA, S12.8XXD, S12.8XXS

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.

Official Coding Guidelines

Verbatim excerpts from the ICD-10-CM Official Guidelines for Coding and Reporting (CMS/NCHS) that govern this code.

Do Not Confuse With

Codes named in S12.8XXA's own official notes, or sharing its encounter family, with what separates them. Each links to the full comparison.

• S12.8XXD— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

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

  Full comparison: S12.8XXA vs S12.8XXD →

• S12.8XXS— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

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

  Full comparison: S12.8XXA vs S12.8XXS →

• T20— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

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

  Full comparison: S12.8XXA vs T20 →

• T32— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

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

  Full comparison: S12.8XXA vs T32 →

• T18.1— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

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

  Full comparison: S12.8XXA vs T18.1 →

• T17.3— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

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

  Full comparison: S12.8XXA vs T17.3 →

Relationships are read from this code's own official notes and its encounter family; the wording of each distinction is MedCoder editorial. 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: 1 Code First instruction — the underlying condition is sequenced before this code when present. See the Code First notes
3. 7 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

• MCC 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

Other codes that name S12.8XXA 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 4 Excludes1 notes: M48.4 — Fatigue fracture of vertebra (via S12.-), M48.5 — Collapsed vertebra, not elsewhere classified (via S12.-), M84.3 — Stress fracture (via S12.-), M84.4 — Pathological fracture, not elsewhere classified (via S12.-).

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

Referenced by 3 Excludes2 notes: S11 — Open wound of neck (via S12.-), S13.1 — Subluxation and dislocation of cervical vertebrae (via S12.-), S27 — Injury of other and unspecified intrathoracic organs (via S12.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 1 Use Additional Code instruction: T71.16 — Asphyxiation due to hanging (via S12.-).

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

MS-DRG Grouper Relationships (FY2026)

MCC — Major 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 25 clinically related codes on its CMS exclusion list. Does not count toward severity when the stay groups to DRGs 957-959 (Other O.R. Procedures for Multiple Significant Trauma); DRGs 963-965 (Other Multiple Significant Trauma).

Potential MS-DRG participation — not a DRG assignment.

Named in the grouper logic of 9 MS-DRGs: DRG 011 (MDC PRE), DRG 012 (MDC PRE), DRG 013 (MDC PRE), DRG 154 (MDC 03), DRG 155 (MDC 03), DRG 156 (MDC 03), 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):INJ002 — Fracture of the spine and back, 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 clinical process (MS-DRG)

Acts as MCC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

S03.8XXA — Sprain of joints and ligaments of other parts of head, initial encounter, S03.9XXA — Sprain of joints and ligaments of unspecified parts of head, initial encounter, S29.011A — Strain of muscle and tendon of front wall of thorax, initial encounter, S29.012A — Strain of muscle and tendon of back wall of thorax, initial encounter, S29.019A — Strain of muscle and tendon of unspecified wall of thorax, initial encounter, S38.3XXA — Transection (partial) of abdomen, initial encounter, S39.011A — Strain of muscle, fascia and tendon of abdomen, initial encounter, S39.012A — Strain of muscle, fascia and tendon of lower back, initial encounter, S39.013A — Strain of muscle, fascia and tendon of pelvis, initial encounter, T07.XXXA — Unspecified multiple injuries, initial encounter, T14.8XXA — Other injury of unspecified body region, initial encounter, T14.90XA — Injury, unspecified, initial encounter, T14.91XA — Suicide attempt, initial encounter, T79.8XXA — Other early complications of trauma, initial encounter, T79.9XXA — Unspecified early complication of trauma, initial encounter, T79.A0XA — Compartment syndrome, unspecified, initial encounter, T79.A11A — Traumatic compartment syndrome of right upper extremity, initial encounter, T79.A12A — Traumatic compartment syndrome of left upper extremity, initial encounter, T79.A19A — Traumatic compartment syndrome of unspecified upper extremity, initial encounter, T79.A21A — Traumatic compartment syndrome of right lower extremity, initial encounter, +4 more

Same injury, other encounter phase

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

S12.8XXD — Fracture of other parts of neck, subsequent encounterCompare S12.8XXA vs S12.8XXD →, S12.8XXS — Fracture of other parts of neck, sequelaCompare S12.8XXA vs S12.8XXS →

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Vertebral Fractures without Spinal Cord Injury) for risk-adjusted payment.

S12.64XA — Type III traumatic spondylolisthesis of seventh cervical vertebra, initial encounter for closed fracture, S12.64XB — Type III traumatic spondylolisthesis of seventh cervical vertebra, initial encounter for open fracture, S12.650A — Other traumatic displaced spondylolisthesis of seventh cervical vertebra, initial encounter for closed fracture, S12.650B — Other traumatic displaced spondylolisthesis of seventh cervical vertebra, initial encounter for open fracture, S12.651A — Other traumatic nondisplaced spondylolisthesis of seventh cervical vertebra, initial encounter for closed fracture, S12.651B — Other traumatic nondisplaced spondylolisthesis of seventh cervical vertebra, initial encounter for open fracture, S12.690A — Other displaced fracture of seventh cervical vertebra, initial encounter for closed fracture, S12.690B — Other displaced fracture of seventh cervical vertebra, initial encounter for open fracture, S12.691A — Other nondisplaced fracture of seventh cervical vertebra, initial encounter for closed fracture, S12.691B — Other nondisplaced fracture of seventh cervical vertebra, initial encounter for open fracture, S12.9XXA — Fracture of neck, unspecified, initial encounter, S22.000A — Wedge compression fracture of unspecified thoracic vertebra, initial encounter for closed fracture, S22.000B — Wedge compression fracture of unspecified thoracic vertebra, initial encounter for open fracture, S22.001A — Stable burst fracture of unspecified thoracic vertebra, initial encounter for closed fracture, S22.001B — Stable burst fracture of unspecified thoracic vertebra, initial encounter for open fracture, S22.002A — Unstable burst fracture of unspecified thoracic vertebra, initial encounter for closed fracture, S22.002B — Unstable burst fracture of unspecified thoracic vertebra, initial encounter for open fracture, S22.008A — Other fracture of unspecified thoracic vertebra, initial encounter for closed fracture, S22.008B — Other fracture of unspecified thoracic vertebra, initial encounter for open fracture, S22.009A — Unspecified fracture of unspecified thoracic vertebra, initial encounter for closed fracture, +318 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Fracture of the spine and back, initial encounter).

+329 more

Contextual Map

Every relationship of S12.8XXA 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 S12.8XXA with these 8 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
• S10-S19 — Injuries to the neck[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Excludes1 notes

• M48.4 — Fatigue fracture of vertebra[Excludes1](via S12.-): “traumatic fracture of vertebrae (S12.0-S12.3-, S22.0-, S32.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• M48.5 — Collapsed vertebra, not elsewhere classified[Excludes1](via S12.-): “traumatic fracture of vertebra (S12.-, S22.-, S32.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• M84.3 — Stress fracture[Excludes1](via S12.-): “traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• M84.4 — Pathological fracture, not elsewhere classified[Excludes1](via S12.-): “traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes2 notes

• S11 — Open wound of neck[Excludes2](via S12.-): “open fracture of vertebra (S12.- with 7th character B)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S13.1 — Subluxation and dislocation of cervical vertebrae[Excludes2](via S12.-): “fracture of cervical vertebrae (S12.0-S12.3-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S27 — Injury of other and unspecified intrathoracic organs[Excludes2](via S12.-): “injury of cervical esophagus (S10-S19)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Use Additional Code instructions

• T71.16 — Asphyxiation due to hanging[Use Additional Code](via S12.-): “fracture of cervical vertebrae (S12.0-S12.2-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

• INJ002 — Fracture of the spine and back, initial encounter[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

Risk adjustment (CMS-HCC)

• HCC 401 — Vertebral Fractures without Spinal Cord Injury [CMS-HCC]— CMS-HCC V28 · 2026

MS-DRG Grouper (9)

• MCC — Major Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (MCC). Not counted when the stay groups to 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 011 — TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITH MCC[MS-DRG]: “TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITH MCC (MDC PRE)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 012 — TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITH CC[MS-DRG]: “TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITH CC (MDC PRE)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 013 — TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITHOUT CC/MCC[MS-DRG]: “TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITHOUT CC/MCC (MDC PRE)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 154 — OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITH MCC[MS-DRG]: “OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITH MCC (MDC 03)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 155 — OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITH CC[MS-DRG]: “OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITH CC (MDC 03)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 156 — OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITHOUT CC/MCC[MS-DRG]: “OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITHOUT CC/MCC (MDC 03)”— 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
• and 2 more

MDC crossing

• Pre-MDC[MDC crossing]: “Pre-MDC — 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. 153 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026
• MDC 03 — Diseases and Disorders of the Ear, Nose, Mouth and Throat[MDC crossing]: “Diseases and Disorders of the Ear, Nose, Mouth and Throat — 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. 5,147 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Nearest codes (40)

• S12 — Fracture of cervical vertebra and other parts of neck[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S12.64XG — Type III traumatic spondylolisthesis of seventh cervical vertebra, subsequent encounter for fracture with delayed healing[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S12.64XK — Type III traumatic spondylolisthesis of seventh cervical vertebra, subsequent encounter for fracture with nonunion[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S12.64XS — Type III traumatic spondylolisthesis of seventh cervical vertebra, sequela[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S12.65 — Other traumatic spondylolisthesis of seventh cervical vertebra[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S12.650 — Other traumatic displaced spondylolisthesis of seventh cervical vertebra[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S12.650A — Other traumatic displaced spondylolisthesis of seventh cervical vertebra, initial encounter for closed fracture[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S12.650B — Other traumatic displaced spondylolisthesis of seventh cervical vertebra, initial encounter for open fracture[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

Coding guidelines Official source data

ICD-10-CM Official Guidelines for Coding and Reporting (FY2026), quoted by section 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 S12.8XXA in its code family, with their registry titles.

• S12.691D — Other nondisplaced fracture of seventh cervical vertebra, subsequent encounter for fracture with routine healing
• S12.691G — Other nondisplaced fracture of seventh cervical vertebra, subsequent encounter for fracture with delayed healing
• S12.691K — Other nondisplaced fracture of seventh cervical vertebra, subsequent encounter for fracture with nonunion
• S12.691S — Other nondisplaced fracture of seventh cervical vertebra, sequela
• S12.8 — Fracture of other parts of neck
• S12.8XXD — Fracture of other parts of neck, subsequent encounter
• S12.8XXS — Fracture of other parts of neck, sequela
• S12.9 — Fracture of neck, unspecified
• S12.9XXA — Fracture of neck, unspecified, initial encounter
• S12.9XXD — Fracture of neck, unspecified, subsequent encounter

View all codes in the S12 family