M85.8
⚠ Non-billable (Header)Other specified 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.
Also Known As
Hyperostosis of bones, except skullOsteosclerosis, acquired
❌ Excludes1
directCannot be coded with M85.8
- • diffuse idiopathic skeletal hyperostosis [DISH] (M48.1)
- • osteosclerosis congenita (Q77.4)
- • osteosclerosis fragilitas (generalista) (Q78.2)
- • osteosclerosis myelofibrosis (D75.81)
❌ 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)
Child Codes (10)
M85.80Other specified disorders of bone density and structure, unspecified siteM85.81Other specified disorders of bone density and structure, shoulderM85.82Other specified disorders of bone density and structure, upper armM85.83Other specified disorders of bone density and structure, forearmM85.84Other specified disorders of bone density and structure, handM85.85Other specified disorders of bone density and structure, thighM85.86Other specified disorders of bone density and structure, lower legM85.87Other specified disorders of bone density and structure, ankle and footM85.88Other specified disorders of bone density and structure, other siteM85.89Other specified disorders of bone density and structure, multiple sites
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CodeM85.8
BillableNo — Header code
ParentM85
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes18 rule(s)
Excludes20 note(s)
Child codes10
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)