Osteoarthritis of knee (M17) ICD-10-CM
The M17 code range covers osteoarthritis of knee with 14 ICD-10-CM diagnosis codes. 11 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the M17 Range 14 codes · 11 billable
- M17 Osteoarthritis of kneeNon-billable
- M17.0 Bilateral primary osteoarthritis of knee
- M17.1 Unilateral primary osteoarthritis of kneeNon-billable
- M17.10 Unilateral primary osteoarthritis, unspecified knee
- M17.11 Unilateral primary osteoarthritis, right knee
- M17.12 Unilateral primary osteoarthritis, left knee
- M17.2 Bilateral post-traumatic osteoarthritis of knee
- M17.3 Unilateral post-traumatic osteoarthritis of kneeNon-billable
- M17.30 Unilateral post-traumatic osteoarthritis, unspecified knee
- M17.31 Unilateral post-traumatic osteoarthritis, right knee
- M17.32 Unilateral post-traumatic osteoarthritis, left knee
- M17.4 Other bilateral secondary osteoarthritis of knee
- M17.5 Other unilateral secondary osteoarthritis of knee
- M17.9 Osteoarthritis of knee, unspecified
About the M17 Code Range
The ICD-10 code M17 and its subcodes specifically classify different forms of osteoarthritis affecting the knee, including distinctions by side, cause, and extent. These codes help identify whether the condition is primary or secondary, unilateral or bilateral, and whether trauma is involved.
Osteoarthritis of the knee, commonly referred to in various ways such as "primary gonarthrosis," "patellofemoral osteoarthritis," or simply "osteoarthritis of the knee," is precisely categorized within this section. For example, M17.0 covers bilateral primary osteoarthritis, including terms like "bilateral disorder of patellofemoral joints," while M17.1 differentiates unilateral primary cases with further detail down to right (M17.11) or left knee (M17.12). Traumatic origins are coded under M17.2 and M17.3, specifying bilateral or unilateral post-traumatic osteoarthritis, sometimes noted as "gonarthrosis due to trauma." Secondary osteoarthritis, indicating arthritis caused by another condition, falls under M17.4 and M17.5 for bilateral and unilateral cases, respectively. When laterality or specifics are unknown, M17.9 is used for unspecified osteoarthritis of the knee. These distinctions are essential for accurate diagnosis coding and treatment planning in knee osteoarthritis.
Questions About This Page
How many billable codes are in the M17 range?
Of the 14 codes in this range, 11 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the M17 range classify?
The range classifies osteoarthritis of knee. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
