M00 – Pyogenic arthritis

ICD-10-CM 2027 diagnosis code · Infectious arthropathies

Non-billable header

ICD-10-CM code M00

Code: M00 (claims format: M00)
Description: Pyogenic arthritis
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M00-M02 Infectious arthropathies

Billable codes under M00

M00 is a header code and cannot be used on claims. Choose the most specific code:

M00.0 – Staphylococcal arthritis and polyarthritisHeader (more codes below)
M00.1 – Pneumococcal arthritis and polyarthritisHeader (more codes below)
M00.2 – Other streptococcal arthritis and polyarthritisHeader (more codes below)
M00.8 – Arthritis and polyarthritis due to other bacteriaHeader (more codes below)
M00.9 – Pyogenic arthritis, unspecifiedBillable

Notes for M00

Excludes2 (not included here):

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

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block M00-M02

Notes:

This block comprises arthropathies due to microbiological agents. Distinction is made between the following types of etiological relationship:
a) direct infection of joint, where organisms invade synovial tissue and microbial antigen is present in the joint;
b) indirect infection, which may be of two types: a reactive arthropathy, where microbial infection of the body is established but neither organisms nor antigens can be identified in the joint, and a postinfective arthropathy, where microbial antigen is present but recovery of an organism is inconstant and evidence of local multiplication is lacking.

Frequently asked questions

What is ICD-10 code M00?

M00 is the ICD-10-CM code for pyogenic arthritis, in the block M00-M02 (Infectious arthropathies).

Is M00 a billable code?

No. M00 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.