Infectious arthropathies (M00-M02) ICD-10-CM
The M00–M02 section covers infectious arthropathies with 325 ICD-10-CM diagnosis codes, of which 242 are billable in fiscal year 2026. The section is organized into the 3 code ranges listed below.
- 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.
Code Ranges in This Section 3 ranges · 325 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| M00 | Pyogenic arthritis (M00) | 130 | 97 |
| M01 | Direct infections of joint in infectious and parasitic diseases classified elsewhere (M01) | 33 | 24 |
| M02 | Postinfective and reactive arthropathies (M02) | 162 | 121 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the M00–M02 Code Range
ICD-10 codes M00-M02 cover infectious arthropathies, which are joint diseases caused by infections or occur as reactions after infections. These codes are used to specify types of infectious arthritis (like bacterial), direct joint infections linked to other diseases, and reactive or postinfectious joint conditions.
This range includes M00 codes for pyogenic (bacterial) arthritis caused by organisms such as Staphylococcus (Staphylococcal arthritis), Pneumococcus (Pneumococcal arthritis), or other bacteria. Detailed location-specific codes identify affected joints (shoulder, elbow, knee, etc.). For instance, codes like M00.011 represent Staphylococcal arthritis of the right shoulder. The section also encompasses unspecified cases and polyarthritis (infection in multiple joints). The M01 codes address direct infections of joints due to infectious and parasitic diseases classified elsewhere — including fungal or viral arthritis commonly linked to systemic infections. Lastly, M02 codes cover postinfective and reactive arthropathies, such as postdysenteric arthropathy and Reiter’s disease, with subcodes describing specific joints affected. These codes help distinguish arthritis caused directly by infection from immune-mediated joint inflammation following an infection, which is essential for precise medical coding and clinical clarity.
Questions About This Page
How many codes are in the M00-M02 range?
The M00-M02 range contains 325 ICD-10-CM diagnosis codes in FY 2026. 242 of them are billable, and the rest are category headers that organize the section.
What conditions does M00-M02 cover?
The range covers infectious arthropathies. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
