ICD-10-CM 2027 diagnosis code

M86Osteomyelitis

Not billable — use a more specific code

M86 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 M86

M86 is the ICD-10-CM diagnosis code for osteomyelitis. It belongs to block M86-M90 (other osteopathies) 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: M86.0 (osteomyelitis), M86.1 (osteomyelitis), M86.2 (osteomyelitis), M86.3 (osteomyelitis), M86.4 (sinus), M86.5 (osteomyelitis), M86.6 (osteomyelitis), M86.8 (osteomyelitis) and 1 more.

Don't report M86 together with the conditions in its Excludes1 note: echinococcus (B67.2), gonococcus (A54.43) and salmonella (A02.24).

The conditions in its Excludes2 note aren't part of M86, but may be coded alongside it if the patient has both: orbit (H05.0-), petrous bone (H70.2-) and vertebra (M46.2-).

Use an additional code (B95-B97) to identify infectious agent. Use an additional code to identify major osseous defect, if applicable (M89.7-).

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 M86

Coding notes

Excludes1Not coded here — never report together with this code

osteomyelitis due to:
echinococcus (B67.2)
gonococcus (A54.43)
salmonella (A02.24)

Excludes2Not included here — may be reported together if both conditions exist

ostemyelitis of:
orbit (H05.0-)
petrous bone (H70.2-)
vertebra (M46.2-)

Use additional codeAdd a secondary code to fully describe the condition

code (B95-B97) to identify infectious agent
code to identify major osseous defect, if applicable (M89.7-)

Notes that apply from higher levels

Instructions written at a parent level also apply to M86.

Broader instructions also apply from M86-M90 Other osteopathies and Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Codes whose notes reference M86

M89.7Code first

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 M86

Is M86 billable?: No. M86 is a header code. Report one of its more specific subcodes instead.