T79.A29S
Traumatic compartment syndrome of unspecified lower extremity, sequela
T79.A29S (also written T79A29S) is a billable ICD-10-CM diagnosis code for traumatic compartment syndrome of unspecified lower extremity, sequela. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 54 codes in category T79 (Certain early complications of trauma, not elsewhere classified). Its 7th character, S, means sequela. Its coding notes include a Use additional code instruction, 2 Excludes1 entries and 7 Excludes2 entries.
7th character
Category T79 requires a 7th character.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
The 7th character depends on whether the patient is in active treatment, not on who sees the patient. An aftercare Z code is not used for injury aftercare.
Use additional code
Add the listed code as a secondary code, if known.
Also from chapter/block level (1 note)
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (2 notes)
- birth trauma (P10-P15)
- obstetric trauma (O70-O71)
Notes
Also from chapter/block level (2 notes)
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.