Question 1

What is ICD-10 code M89.029?

Accepted Answer

M89.029 is the ICD-10-CM diagnosis code for algoneurodystrophy, unspecified upper arm. Complex regional pain syndrome affecting the upper arm when the specific side (left or right) is not documented or is bilateral. M89.029 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other osteopathies (m86-m90).

M89.029 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28, V24, ESRD, or RxHCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.

This is a default code when laterality is not specified; attempt to clarify with provider documentation.

Question 2

Is M89.029 an HCC code?

Accepted Answer

No. M89.029 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 M89.029 billable?

Accepted Answer

Yes. M89.029 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. M89.029 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

Which HCC does M89.029 map to under V28?

Accepted Answer

M89.029 does not map to a CMS-HCC V28 payment category. Check the current CMS-HCC V28 model file for payment year 2026 rather than an older V24 tip sheet.

Question 5

What RAF reference is published for M89.029?

Accepted Answer

M89.029 has no separately stated V28 community reference coefficient. Check the current CMS mapping and factor files before using it in any member-score workflow.

Question 6

What is the V28 vs V24 difference for M89.029?

Accepted Answer

M89.029 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 community model rewards M89.029 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's V28/V24 community RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a community payment HCC.

Question 7

What documentation supports M89.029?

Accepted Answer

This is a default code when laterality is not specified; attempt to clarify with provider documentation If bilateral upper arm involvement is confirmed, code both M89.021 and M89.022 M89.029 is not a CMS-HCC payment code, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

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M89.029

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M89.029 ICD-10-CM Code: Algoneurodystrophy, unspecified upper arm

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M89.029

Is M89.029 an HCC code?

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What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Work M89.029 in HCC Buddy