M85.0
⚠ Non-billable (Header)Fibrous dysplasia (monostotic)
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
- • fibrous dysplasia of jaw (M27.8)
Child Codes (10)
M85.00Fibrous dysplasia (monostotic), unspecified siteM85.01Fibrous dysplasia (monostotic), shoulderM85.02Fibrous dysplasia (monostotic), upper armM85.03Fibrous dysplasia (monostotic), forearmM85.04Fibrous dysplasia (monostotic), handM85.05Fibrous dysplasia (monostotic), thighM85.06Fibrous dysplasia (monostotic), lower legM85.07Fibrous dysplasia (monostotic), ankle and footM85.08Fibrous dysplasia (monostotic), other siteM85.09Fibrous dysplasia (monostotic), multiple sites
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CodeM85.0
BillableNo — Header code
ParentM85
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes14 rule(s)
Excludes21 note(s)
Child codes10
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)