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M85

⚠ Non-billable (Header)

Other disorders of bone density and structure

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.

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❌ Excludes1

direct

Cannot be coded with M85

  • • osteogenesis imperfecta (Q78.0)
  • • osteopetrosis (Q78.2)
  • • osteopoikilosis (Q78.8)
  • • polyostotic fibrous dysplasia (Q78.1)

Child Codes (9)

M85.0Fibrous dysplasia (monostotic)M85.1Skeletal fluorosisM85.2Hyperostosis of skullM85.3Osteitis condensansM85.4Solitary bone cystM85.5Aneurysmal bone cystM85.6Other cyst of boneM85.8Other specified disorders of bone density and structureM85.9Disorder of bone density and structure, unspecified

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Code Information

CodeM85
BillableNo — Header code
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes14 rule(s)
Excludes20 note(s)
Child codes9

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)