ICD-10-CM 2027 diagnosis code

T79.A0Compartment syndrome, unspecified

Not billable — use a more specific codeRequires 7th character

T79.A0 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.

Looking up by condition? See ICD-10 code for Compartment syndrome.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T79.A0

T79.A0 is the ICD-10-CM diagnosis code for compartment syndrome, unspecified. It belongs to category T79 (certain early complications of trauma, not elsewhere classified), block T79 (certain early complications of trauma) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within T79.A, choose T79.A0 (Compartment syndrome, unspecified) only when documentation doesn't support a more specific option: of upper extremity (T79.A1), of lower extremity (T79.A2), of abdomen (T79.A3) and of other sites (T79.A9).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

The appropriate 7th character is to be added to each code from category T79

Ainitial encounterT79.A0XA
Dsubsequent encounterT79.A0XD
SsequelaT79.A0XS

Coding notes

Applicable toConditions and synonyms classified to this code

Compartment syndrome NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to T79.A0.

› From T79.A Traumatic compartment syndrome

Excludes1

fibromyalgia (M79.7)
nontraumatic compartment syndrome (M79.A-)

Excludes2

traumatic ischemic infarction of muscle (T79.6)

› From T79 Certain early complications of trauma, not elsewhere classified

Excludes2

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)

Broader instructions also apply from Chapter 19: Injury, poisoning and certain other consequences of external causes.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to T79.A0.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about T79.A0

Is T79.A0 billable?: No. T79.A0 is a header code. Report one of its more specific subcodes instead.