M85.2 Hyperostosis of skull

Billable ICD-10-CM code, FY2026.

Applies from M85 Other disorders of bone density and structure

Excludes1 (never code together)

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

MS-DRG index

Defines the logic of DRG(s) 564-566 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 733.3 Hyperostosis of skull

Diagnosis Index entries for M85.2

• Buchem's syndrome (hyperostosis corticalis)
• Craniopathy, metabolic
• Disease, diseased › Morgagni's (syndrome) (hyperostosis frontalis interna)
• Disorder (of) › bone › density and structure › hyperostosis of skull
• Hyperostosis (monomelic) › cortical (skull)
• Hyperostosis (monomelic) › frontal, internal of skull
• Hyperostosis (monomelic) › interna frontalis
• Hyperostosis (monomelic) › skull
• Leontiasis › ossium
• Morel (-Stewart)(-Morgagni) syndrome
• Morel-Moore syndrome
• Morgagni's › syndrome
• Morgagni-Stewart-Morel syndrome
• Stewart-Morel syndrome
• Syndrome › Buchem's
• Syndrome › Morel-Moore
• Syndrome › Morel-Morgagni
• Syndrome › Morgagni (-Morel) (-Stewart)
• Syndrome › Stewart-Morel
• Syndrome › van Buchem's
• Van Buchem's syndrome

Nearby codes

• M85.171 Skeletal fluorosis, right ankle and foot
• M85.172 Skeletal fluorosis, left ankle and foot
• M85.179 Skeletal fluorosis, unspecified ankle and foot
• M85.18 Skeletal fluorosis, other site
• M85.19 Skeletal fluorosis, multiple sites
• M85.2 Hyperostosis of skull (this code)
• M85.3 Osteitis condensans
• M85.30 Osteitis condensans, unspecified site
• M85.31 Osteitis condensans, shoulder
• M85.311 Osteitis condensans, right shoulder
• M85.312 Osteitis condensans, left shoulder