Question 1

What is ICD-10 code M65.351?

Accepted Answer

M65.351 is the ICD-10-CM diagnosis code for trigger finger, right little finger. A condition where the tendon in the right little finger (pinky) gets stuck or catches, causing the finger to lock or snap when bending or straightening. M65.351 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering disorders of synovium and tendon (m65-m67).

M65.351 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.

Confirm the affected finger is the little finger and the side is right before assigning.

Question 2

Is M65.351 an HCC code?

Accepted Answer

No. M65.351 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 M65.351 billable?

Accepted Answer

Yes. M65.351 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. M65.351 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 M65.351?

Accepted Answer

M65.351 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 M65.351 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 M65.351?

Accepted Answer

Confirm the affected finger is the little finger and the side is right before assigning Use M65.352 if the condition affects the left little finger instead

M65.351

Is M65.351 an HCC code?

What This Code Means

Coding Tips

Code Hierarchy

Open M65.351 in the Interactive Encoder