Question 1

What is ICD-10 code M67.311?

Accepted Answer

M67.311 is the ICD-10-CM diagnosis code for transient synovitis, right shoulder. Temporary inflammation of the synovial membrane in the right shoulder that typically resolves without long-term complications. M67.311 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).

M67.311 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 right shoulder is the affected site and document any associated symptoms like pain or swelling.

Question 2

Is M67.311 an HCC code?

Accepted Answer

No. M67.311 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 M67.311 billable?

Accepted Answer

Yes. M67.311 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. M67.311 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 M67.311?

Accepted Answer

M67.311 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 M67.311 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 M67.311?

Accepted Answer

Confirm right shoulder is the affected site and document any associated symptoms like pain or swelling Note the duration of symptoms to support the transient nature of the condition

M67.311

Is M67.311 an HCC code?

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Code Hierarchy

Open M67.311 in the Interactive Encoder