T79.A2
Traumatic compartment syndrome of lower extremity
T79.A2 is a non-billable ICD-10-CM code header for traumatic compartment syndrome of lower extremity. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are T79.A21 Traumatic compartment syndrome of right lower extremity, T79.A22 Traumatic compartment syndrome of left lower extremity and T79.A29 Traumatic compartment syndrome of unspecified lower extremity. Its coding notes include a Use additional code instruction, 2 Excludes1 entries and 7 Excludes2 entries.
7th characters
Every code below needs one of these (defined at T79).
The appropriate 7th character is to be added to each code from category T79
- Ainitial encounter
- Dsubsequent encounter
- Ssequela
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)
Inclusion terms
Conditions classified to this code.
- Traumatic compartment syndrome of hip, buttock, thigh, leg, foot, and toes
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.
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 2 entries