ICD-10-CM 2027 diagnosis code

M85Other disorders of bone density and structure

Not billable — use a more specific code

M85 is a header code, so it can't be reported by itself. Choose one of the 9 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M85

M85 is the ICD-10-CM diagnosis code for other disorders of bone density and structure. It belongs to block M80-M85 (disorders of bone density and structure) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: M85.0 ((monostotic)), M85.1 (fluorosis), M85.2 (skull), M85.3 (condensans), M85.4 (cyst), M85.5 (cyst), M85.6 (bone), M85.8 (structure) and 1 more.

Don't report M85 together with the conditions in its Excludes1 note: osteogenesis imperfecta (Q78.0), osteopetrosis (Q78.2), osteopoikilosis (Q78.8) and polyostotic fibrous dysplasia (Q78.1).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under M85

Coding notes

Excludes1Not coded here — never report together with this code

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

Notes that apply from higher levels

Instructions written at a parent level also apply to M85.

Broader instructions also apply from Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about M85

Is M85 billable?: No. M85 is a header code. Report one of its more specific subcodes instead.