2026 ICD-10-CM Diagnosis Code T79.A29STraumatic compartment syndrome of unspecified lower extremity, sequela

ICD-10-CM Codes›S00–T88›T79›T79

ICD-10-CM T79.A29S
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T79.A29S is a billable ICD-10-CM diagnosis code for traumatic compartment syndrome of unspecified lower extremity, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 913 through 914. The code is exempt from POA reporting. Coders also document this condition as anterior tibial compartment syndrome. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.

Code Identity

ICD-10-CM Code
T79.A29S
Billable Status
Yes — Valid for Submission
Code Describes
Traumatic compartment syndrome of unspecified lower extremity, sequela
Short Description
Traumatic compartment syndrome of unsp low extrm, sequela
Parent Code
T79.A29
Traumatic compartment syndrome of unspecified lower extremity

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT79Certain early complications of trauma
CategoryT79Certain early complications of trauma, not elsewhere classified
This CodeT79.A29STraumatic compartment syndrome of unspecified lower extremity, sequela

Present on Admission (POA)Billing

T79.A29S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anterior tibial compartment syndrome
  • Anterior tibial compartment syndrome due to traumatic injury
  • Compartment syndrome of buttock due to traumatic injury
  • Compartment syndrome of foot due to traumatic injury
  • Compartment syndrome of lower leg due to traumatic injury
  • Compartment syndrome of lower limb due to traumatic injury
  • Compartment syndrome of thigh due to traumatic injury
  • Lateral peroneal compartment syndrome due to traumatic injury
  • Posterior tibial compartment syndrome due to traumatic injury
  • Psoas compartment syndrome due to traumatic injury

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Certain early complications of trauma, not elsewhere classified (T79). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ073
Injury, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Muscle Disorders

Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert T79.A29S to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
908.6 Late eff complic trauma
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T79.A29SOverview

Is T79.A29S a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report traumatic compartment syndrome of unspecified lower extremity, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in T79.A29S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the traumatic compartment syndrome of unspecified lower extremity itself has resolved, not the original event.

What MS-DRG does T79.A29S group to?

When traumatic compartment syndrome of unspecified lower extremity, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 913, 914, with relative weights from 0.8855 to 1.6346 depending on complications. Higher weights mean higher Medicare reimbursement.

Is T79.A29S exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for traumatic compartment syndrome of unspecified lower extremity, sequela on inpatient claims.

What is the ICD-9 equivalent of T79.A29S?

Under the General Equivalence Mappings, traumatic compartment syndrome of unspecified lower extremity, sequela converts to ICD-9-CM 908.6 (late eff complic trauma). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.