M17.9 Osteoarthritis of knee, unspecified

Billable ICD-10-CM code, FY2026.

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 715.36 Osteoarthrosis, localized, not specified whether primary or secondary, lower leg (approximate)
• 715.96 Osteoarthrosis, unspecified whether generalized or localized, lower leg (approximate)

Code annotations containing back-references to M17.9

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)")

Diagnosis Index entries for M17.9

• Osteoarthritis › knee

Nearby codes

• 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 (this code)