M85.521: Aneurysmal bone cyst, right upper arm
M85.521 is the billable ICD-10-CM diagnosis code for Aneurysmal bone cyst, right upper arm. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code M85.521?
M85.521 is the ICD-10-CM diagnosis code for Aneurysmal bone cyst, right upper arm. It belongs to category M85 (Other disorders of bone density and structure).
Is M85.521 a billable code?
Yes. M85.521 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does M85.521 belong to?
M85.521 is part of ICD-10-CM category M85 — Other disorders of bone density and structure, which has 338 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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