M85.4
⚠ Non-billable (Header)Solitary bone cyst
Diseases of the musculoskeletal system and connective tissue (M00-M99)
⚠️ This is a category header code — not billable. Use a more specific child code below.
❌ Excludes1
inherited from M85Rules from parent category M85: Other disorders of bone density and structure
- • osteogenesis imperfecta (Q78.0)
- • osteopetrosis (Q78.2)
- • osteopoikilosis (Q78.8)
- • polyostotic fibrous dysplasia (Q78.1)
⚠️ Excludes2
directMay be coded together if both conditions coexist
- • solitary cyst of jaw (M27.4)
Child Codes (9)
M85.40Solitary bone cyst, unspecified siteM85.41Solitary bone cyst, shoulderM85.42Solitary bone cyst, humerusM85.43Solitary bone cyst, ulna and radiusM85.44Solitary bone cyst, handM85.45Solitary bone cyst, pelvisM85.46Solitary bone cyst, tibia and fibulaM85.47Solitary bone cyst, ankle and footM85.48Solitary bone cyst, other site
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CodeM85.4
BillableNo — Header code
ParentM85
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes14 rule(s)
Excludes21 note(s)
Child codes9
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)