Question 1

What is ICD-10 code M84.834?

Accepted Answer

M84.834 is the ICD-10-CM diagnosis code for other disorders of continuity of bone, left radius. A disorder affecting the structural continuity of the left forearm bone (radius) that doesn't fit into other specific bone conditions. M84.834 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering disorders of bone density and structure (m80-m85).

M84.834 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 left side is documented; this code applies to the radius on the thumb side of the left forearm.

Question 2

Is M84.834 an HCC code?

Accepted Answer

No. M84.834 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 M84.834 billable?

Accepted Answer

Yes. M84.834 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. M84.834 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 M84.834?

Accepted Answer

M84.834 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 M84.834 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 M84.834?

Accepted Answer

Confirm left side is documented; this code applies to the radius on the thumb side of the left forearm Review clinical notes to distinguish from other radius pathologies

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M84.834

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M84.834 ICD-10-CM Code: Other disorders of continuity of bone, left radius

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M84.834

Is M84.834 an HCC code?

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Work M84.834 in HCC Buddy