ICD-10-CM 2027 diagnosis code

M00Pyogenic arthritis

Not billable — use a more specific code

M00 is a header code, so it can't be reported by itself. Choose one of the 5 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 M00

M00 is the ICD-10-CM diagnosis code for pyogenic arthritis. It belongs to block M00-M02 (infectious arthropathies) 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 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: M00.0 (polyarthritis), M00.1 (polyarthritis), M00.2 (polyarthritis), M00.8 (bacteria) and M00.9 (unspecified).

The conditions in its Excludes2 note aren't part of M00, but may be coded alongside it if the patient has both: infection and inflammatory reaction due to internal joint prosthesis (T84.5-).

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 M00

Coding notes

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

infection and inflammatory reaction due to internal joint prosthesis (T84.5-)

Notes that apply from higher levels

Instructions written at a parent level also apply to M00.

Broader instructions also apply from M00-M02 Infectious arthropathies and Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Code history

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2026
2027

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

Common questions about M00

Is M00 billable?: No. M00 is a header code. Report one of its more specific subcodes instead.