ICD-10-CM › M00-M99 › M80-M85 › M85 Other disorders of bone density... › M85.2
Hyperostosis of skull
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Hyperostosis of skull
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from M85 Other disorders of bone density and structure
Excludes1 - never coded here
- osteogenesis imperfecta (Q78.0)
- osteopetrosis (Q78.2)
- osteopoikilosis (Q78.8)
- polyostotic fibrous dysplasia (Q78.1)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Exostosis
- Loss > bone
- Hyperostosis
- Change > bone
- Lesion > bone
- Erosion > bone
- Melorheostosis
- Rarefaction, bone
- Disease, diseased > bone
- Loss > substance of > bone
- Development > arrested > bone
- Retardation > endochondral bone growth
- Ossification > multiple, eccentric centers
- Arrest, arrested > development or growth > bone
- Morel syndrome
- Buchem's syndrome
- Leontiasis > ossium
- Syndrome > Buchem's
- Syndrome > Morgagni
- Hyperostosis > skull
- Morel-Moore syndrome
- Morgagni's > syndrome
- Van Buchem's syndrome
- Craniopathy, metabolic
- Stewart-Morel syndrome
- Syndrome > Morel-Moore
- Hyperostosis > cortical
- Syndrome > van Buchem's
- Syndrome > Stewart-Morel
- Syndrome > Morel-Morgagni
- Disease, diseased > Morgagni's
- Morgagni-Stewart-Morel syndrome
- Hyperostosis > interna frontalis
- Hyperostosis > frontal, internal of skull
- Disorder > bone > density and structure > hyperostosis of skull
Codes in the same group
| Code | Description | Status |
|---|---|---|
| M85.0 | Fibrous dysplasia (monostotic) | Not billable |
| M85.1 | Skeletal fluorosis | Not billable |
| M85.3 | Osteitis condensans | Not billable |
| M85.4 | Solitary bone cyst | Not billable |
| M85.5 | Aneurysmal bone cyst | Not billable |
| M85.6 | Other cyst of bone | Not billable |
| M85.8 | Other specified disorders of bone density and structure | Not billable |
| M85.9 | Disorder of bone density and structure, unspecified | Valid |