M85
Header — not billable
Other disorders of bone density and structure
Other disorders of bone density and structure
M85 is a header (parent) code in the ICD-10-CM hierarchy. It is not billable for claim submission. Use one of the billable child codes listed below.
Billable codes in this category
Each of the codes below is billable. Choose the one that most accurately describes the patient's diagnosis.
M85.2
Hyperostosis of skull
M85.9 M85.2 identifies abnormal thickening and overgrowth of the cranial bones (skull hyperostosis) classified under disorders of bone density and structure — not a congenital dysplasia or neoplasm.
Disorder of bone density and structure, unspecified
Unspecified abnormality of bone density or structural integrity where documentation does not identify the specific disorder type or anatomical site.
Inclusion & exclusion notes
Excludes 1 (mutually exclusive — never code together)
- osteogenesis imperfecta (Q78.0)
- osteopetrosis (Q78.2)
- osteopoikilosis (Q78.8)
- polyostotic fibrous dysplasia (Q78.1)