M63.879 ICD-10-CM Code: Disorders of muscle in diseases classified elsewhere, unspecified ankle and foot
HCC Buddy Code Card
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FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Disorders of muscles (M60-M63)
M63.879
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceDisorders of muscle in diseases classified elsewhere, unspecified ankle and foot
Muscle problems in an unspecified ankle and foot caused by another disease that is classified elsewhere in the medical coding system.
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 M63.879 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for M63.879 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for M63.879 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for M63.879 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for M63.879 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for M63.879 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for M63.879 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is M63.879 an HCC code?
No. M63.879 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
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
M63.879 is the ICD-10-CM diagnosis code for disorders of muscle in diseases classified elsewhere, unspecified ankle and foot. Muscle problems in an unspecified ankle and foot caused by another disease that is classified elsewhere in the medical coding system. M63.879 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering disorders of muscles (m60-m63).
M63.879 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.
Use this code only when the specific side (right or left) of the ankle and foot is not documented.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M63.879 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the specific side (right or left) of the ankle and foot is not documented
- •This is a secondary code requiring the underlying disease to be coded first