Billable / Specific Code
ICD-10-CM M85.521 is the diagnosis code for Aneurysmal bone cyst, right upper arm. This code falls under the section "Disorders of bone density and structure" within Chapter 13 — Diseases of the musculoskeletal system and connective tissue (M00-M99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where M85.521 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, M85.521 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
M85.521 is the ICD-10-CM diagnosis code for "Aneurysmal bone cyst, right upper arm". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of M85.521 is M85.52 ("Aneurysmal bone cyst, upper arm"). M85.521 provides a more specific classification within this category.
M85.521 is located in Section M80-M85 — "Disorders of bone density and structure" within Chapter 13 of the ICD-10-CM Tabular List.
Use M85.521 when the patients documented diagnosis matches "Aneurysmal bone cyst, right upper arm" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Aneurysmal bone cyst, right upper arm is M85.521.
Yes, M85.521 can be used as a primary diagnosis code since it is billable and specific.
M85.521 is in Chapter 13 of the ICD-10-CM Tabular List.
Yes, M85.521 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.