Question 1

What is ICD-10 code M61.461?

Accepted Answer

M61.461 is the ICD-10-CM diagnosis code for other calcification of muscle, right lower leg. Calcium deposits have formed in the muscles of the right lower leg (between knee and ankle), causing potential stiffness or movement limitations. M61.461 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).

M61.461 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.

Ensure documentation specifies right lower leg rather than foot or ankle.

Question 2

Is M61.461 an HCC code?

Accepted Answer

No. M61.461 is a billable ICD-10-CM code but does not map to any payment HCC category under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can still be reported on Medicare Advantage encounter data submissions, but it does not contribute to the beneficiary's Risk Adjustment Factor (RAF) score and therefore does not affect the risk-adjusted capitation payment to the plan. V28 reached 100% phase-in for payment year 2026.

Question 3

Is M61.461 billable?

Accepted Answer

Yes. M61.461 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. M61.461 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Question 4

What is the V28 vs V24 difference for M61.461?

Accepted Answer

M61.461 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards M61.461 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

Question 5

What should coders know when reporting M61.461?

Accepted Answer

Ensure documentation specifies right lower leg rather than foot or ankle Lower leg includes the tibia and fibula regions; verify anatomical location in imaging reports

HCC Buddy Code Card

M61.461

Is M61.461 an HCC code?

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Work M61.461 in HCC Buddy

M61.461 ICD-10-CM Code: Other calcification of muscle, right lower leg

HCC Buddy Code Card

M61.461

Is M61.461 an HCC code?

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Work M61.461 in HCC Buddy