M85.5

Hierarchy

Where M85.5 sits in the official hierarchy. Each level is the code it is classified under.

1. M85 Parent Other disorders of bone density and structure
2. M85.5 This code Aneurysmal bone cyst

Official Coding Notes

Reproduced verbatim from the FY 2027 ICD-10-CM files. Notes labelled as inherited are declared on a parent code and apply here too.

• M85.50 Aneurysmal bone cyst, unspecified site Billable
• M85.51 Aneurysmal bone cyst, shoulder Has subcodes
• M85.52 Aneurysmal bone cyst, upper arm Has subcodes
• M85.53 Aneurysmal bone cyst, forearm Has subcodes
• M85.54 Aneurysmal bone cyst, hand Has subcodes
• M85.55 Aneurysmal bone cyst, thigh Has subcodes
• M85.56 Aneurysmal bone cyst, lower leg Has subcodes
• M85.57 Aneurysmal bone cyst, ankle and foot Has subcodes
• M85.58 Aneurysmal bone cyst, other site Billable
• M85.59 Aneurysmal bone cyst, multiple sites Billable

Version History

How M85.5 appears in each release imported from the official files, newest first.

1. FY 2027 Effective October 1, 2026

   Current

   Aneurysmal bone cyst

2. FY 2026 Effective October 1, 2025

   Unchanged

   Aneurysmal bone cyst