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ICD-10-CM 2027 diagnosis code

T79.A29Traumatic compartment syndrome of unspecified lower extremity

Not billable — use a more specific codeRequires 7th character

T79.A29 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.Short description: Traumatic compartment syndrome of unsp lower extremity

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.A29

T79.A29 is the ICD-10-CM diagnosis code for traumatic compartment syndrome of unspecified lower extremity. 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.A2, choose T79.A29 (unspecified lower extremity) only when documentation doesn't support a more specific option: right lower extremity (T79.A21) and left lower extremity (T79.A22).

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

Notes that apply from higher levels

Instructions written at a parent level also apply to T79.A29.

› 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.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about T79.A29

Is T79.A29 billable?

No. T79.A29 is a header code. Report one of its more specific subcodes instead.