M85.421Billable
Solitary bone cyst, right humerus
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue
- Category
- M85
- Effective date
- October 1, 2026
Related codes in category M85
M85Other disorders of bone density and structureM85.0Fibrous dysplasia (monostotic)M85.00Fibrous dysplasia (monostotic), unspecified siteYesM85.01Fibrous dysplasia (monostotic), shoulderM85.011Fibrous dysplasia (monostotic), right shoulderYesM85.012Fibrous dysplasia (monostotic), left shoulderYesM85.019Fibrous dysplasia (monostotic), unspecified shoulderYesM85.02Fibrous dysplasia (monostotic), upper armM85.021Fibrous dysplasia (monostotic), right upper armYesM85.022Fibrous dysplasia (monostotic), left upper armYesM85.029Fibrous dysplasia (monostotic), unspecified upper armYesM85.03Fibrous dysplasia (monostotic), forearm
Frequently asked questions
What is ICD-10 code M85.421?
M85.421 is an ICD-10-CM diagnosis code for Solitary bone cyst, right humerus.
Is M85.421 a billable code?
Yes. M85.421 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is M85.421 in?
M85.421 falls under Chapter 13: Diseases of the musculoskeletal system and connective tissue.
When did M85.421 become effective?
M85.421 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to M85.421?
M85.421 belongs to category M85, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.