M79.A3 ICD-10-CM Code: Nontraumatic compartment syndrome of abdomen
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Other soft tissue disorders (M70-M79)
M79.A3
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceNontraumatic compartment syndrome of abdomen
A serious condition where pressure builds up in the abdominal muscles and tissues, potentially cutting off blood flow and damaging tissue, without being caused by an injury.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for M79.A3 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for M79.A3 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for M79.A3 in this effective period.
Excludes 1
Official- compartment syndrome NOS (T79.A-)
- fibromyalgia (M79.7)
- nontraumatic ischemic infarction of muscle (M62.2-)
- traumatic compartment syndrome (T79.A-)
Code First
Official- , if applicable, associated postprocedural complication
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for M79.A3 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for M79.A3 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is M79.A3 an HCC code?
No. M79.A3 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- M79.A3
- Description
- Nontraumatic compartment syndrome of abdomen
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
M79.A3 is the ICD-10-CM diagnosis code for nontraumatic compartment syndrome of abdomen. A serious condition where pressure builds up in the abdominal muscles and tissues, potentially cutting off blood flow and damaging tissue, without being caused by an injury. M79.A3 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other soft tissue disorders (m70-m79).
M79.A3 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Document which abdominal compartment is affected if specified (anterior, posterior, or peritoneal).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M79.A3 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document which abdominal compartment is affected if specified (anterior, posterior, or peritoneal)
- •This requires urgent surgical evaluation; coordinate with documentation of any associated conditions