Osteoarthritis (M15-M19) ICD-10-CM
The M15–M19 section covers osteoarthritis with 130 ICD-10-CM diagnosis codes, of which 98 are billable in fiscal year 2026. The section is organized into the 5 code ranges listed below.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- osteoarthritis of spine M47
Code Ranges in This Section 5 ranges · 130 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the M15–M19 Code Range
ICD-10 codes M15 through M19 are exclusively used to classify various forms of osteoarthritis, a condition known as the degeneration of joint cartilage and underlying bone, affecting different joints throughout the body. These codes specifically identify osteoarthritis by type, location, and whether it is primary or secondary in nature.
The M15 codes cover polyosteoarthritis, including primary generalized osteoarthritis (also called idiopathic osteoarthritis) and specific manifestations like Heberden’s and Bouchard’s nodes, characteristic swellings in finger joints. M16 codes detail osteoarthritis of the hip, distinguishing between primary, secondary (including those due to hip dysplasia or trauma), unilateral or bilateral involvement. M17 focuses on knee osteoarthritis, including primary, post-traumatic, and secondary forms. M18 codes classify osteoarthritis of the first carpometacarpal joint at the base of the thumb, with distinctions for trauma-related and secondary cases. Finally, M19 encompasses other and unspecified osteoarthritis types affecting various joints like shoulder, elbow, wrist, hand, ankle, and foot, with detailed subcodes for primary, post-traumatic, and secondary osteoarthritis, and unspecified sites. Using these codes helps medical coders accurately document and report specific osteoarthritis conditions by joint site and etiology, improving clinical clarity for treatment and billing.
Questions About This Page
How many codes are in the M15-M19 range?
The M15-M19 range contains 130 ICD-10-CM diagnosis codes in FY 2026. 98 of them are billable, and the rest are category headers that organize the section.
What conditions does M15-M19 cover?
The range covers osteoarthritis. 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.
