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T79.6 vs T79.A0XD

T79.6 (Traumatic ischemia of muscle) compared with T79.A0XD (Compartment syndrome, unspecified, subsequent encounter), from the official CMS tabular data.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Summary

These codes can be reported together when both conditions are documented, because T79.6 lists T79.A0XD under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and billing status.T79.6 is “Traumatic ischemia of muscle”; T79.A0XD is “Compartment syndrome, unspecified, subsequent encounter”. T79.6 is a non-billable header; T79.A0XD is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.T79.6 lists T79.A0XD under Excludes2: “compartment syndrome (traumatic) (T79.A-)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. T79.A0XD carries 2 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.T79.6’s tabular entry: “compartment syndrome (traumatic) (T79.A-)”. The note covers T79.A0XD.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Yes.T79.6’s title names the condition; T79.A0XD’s title is the unspecified form (“Compartment syndrome, unspecified, subsequent encounter”).

MedCoder-derivedGuide: Other vs unspecified (NEC vs NOS)

Is one a parent or header code?

One is a header.T79.6 is a non-billable header, but T79.A0XD is not one of its subdivisions.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

T79.6
Traumatic ischemia of muscle
↔
T79.A0XD
Compartment syndrome, unspecified, subsequent encounter

What we found

Yes, when both are documented.T79.6 carries an Excludes2 note covering T79.A0XD: “compartment syndrome (traumatic) (T79.A-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2027

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

T79.6Traumatic ischemia of muscleT79.A0XDCompartment syndrome, unspecified, subsequent encounter
Billing statusNon-billable header

Report instead: T79.6XXA, T79.6XXD, T79.6XXS

Billable
ClassificationS00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionTraumatic ischemia of muscle is a non-billable ICD-10-CM category code (T79.6).Compartment syndrome, unspecified, subsequent encounter is a billable ICD-10-CM diagnosis code (T79.A0XD).
7th characterThe appropriate 7th character is to be added to each code from category T79The appropriate 7th character is to be added to each code from category T79
Includes
Traumatic rhabdomyolysis
Volkmann's ischemic contracture
Compartment syndrome NOS
Excludes1—
fibromyalgia (M79.7)
nontraumatic compartment syndrome (M79.A-)
Excludes2
anterior tibial syndrome (M76.8)
compartment syndrome (traumatic) (T79.A-)
nontraumatic ischemia of muscle (M62.2-)
acute respiratory distress syndrome (J80)
complications occurring during or following medical procedures (T80-T88)
complications of surgical and medical care NEC (T80-T88)
newborn respiratory distress syndrome (P22.0)
traumatic ischemic infarction of muscle (T79.6)
acute respiratory distress syndrome (J80)
complications occurring during or following medical procedures (T80-T88)
complications of surgical and medical care NEC (T80-T88)
newborn respiratory distress syndrome (P22.0)

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

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Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources