M17.12 Unilateral primary osteoarthritis, left knee

Billable ICD-10-CM code, FY2026.

Applies from M17.1 Unilateral primary osteoarthritis of knee

Applicable to

• Primary osteoarthritis of knee NOS

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 715.16 Osteoarthrosis, localized, primary, lower leg (approximate)

Code annotations containing back-references to M17.12

Back-references to M17

• Type 1 Excludes: M12 Other and unspecified arthropathy ("arthrosis (M15-M19)")
• Type 1 Excludes: M13 Other arthritis ("arthrosis (M15-M19)")
• Type 1 Excludes: M13 Other arthritis ("osteoarthritis (M15-M19)")
• Type 1 Excludes: M13.8 Other specified arthritis ("osteoarthritis (M15-M19)")
• Type 1 Excludes: M15 Polyosteoarthritis ("bilateral involvement of single joint (M16-M19)")

Nearby codes

• M17 Osteoarthritis of knee
• M17.0 Bilateral primary osteoarthritis of knee
• M17.1 Unilateral primary osteoarthritis of knee
• M17.10 Unilateral primary osteoarthritis, unspecified knee
• M17.11 Unilateral primary osteoarthritis, right knee
• M17.12 Unilateral primary osteoarthritis, left knee (this code)
• M17.2 Bilateral post-traumatic osteoarthritis of knee
• M17.3 Unilateral post-traumatic osteoarthritis of knee
• M17.30 Unilateral post-traumatic osteoarthritis, unspecified knee
• M17.31 Unilateral post-traumatic osteoarthritis, right knee
• M17.32 Unilateral post-traumatic osteoarthritis, left knee