2026 ICD-10-CM Diagnosis Code T79.6XXATraumatic ischemia of muscle, initial encounter
T79.6XXA is a billable ICD-10-CM diagnosis code for traumatic ischemia of muscle, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 564 through 566, 963 through 965. Coders also document this condition as anterior tibial stress syndrome. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified injury.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Anterior tibial stress syndrome
- Compartment syndrome of forearm
- Compartment syndrome of upper limb due to traumatic injury
- Deformity after injury
- Ischemia of muscle due to traumatic injury
- Tibial stress syndrome
- Traumatic rhabdomyolysis
- Volkmann contracture
- Volkmann ischemic contracture following traumatic compartment syndrome
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.
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 T79.6XXA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T79.6XXAOverview
Is T79.6XXA (Traumatic ischemia of muscle) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report traumatic ischemia of muscle, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T79.6XXA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for traumatic ischemia of muscle, such as an emergency visit or first evaluation.
What MS-DRG does T79.6XXA group to?
When traumatic ischemia of muscle, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 565, 566, 963, 964, 965, with relative weights from 0.7493 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of T79.6XXA?
Under the General Equivalence Mappings, traumatic ischemia of muscle, initial encounter converts to ICD-9-CM 958.6 (Volkmann's isch contract). 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.
