M19.079 Primary osteoarthritis, unspecified ankle and foot

Billable ICD-10-CM code, FY2026.

Applies from M19 Other and unspecified osteoarthritis

Excludes1 (never code together)

• polyarthritis (M15.-)

Excludes2 (not included here)

• arthrosis of spine (M47.-)
• hallux rigidus (M20.2)
• osteoarthritis of spine (M47.-)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 715.17 Osteoarthrosis, localized, primary, ankle and foot (approximate)

Code annotations containing back-references to M19.079

Back-references to M19

• 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

• M19.042 Primary osteoarthritis, left hand
• M19.049 Primary osteoarthritis, unspecified hand
• M19.07 Primary osteoarthritis ankle and foot
• M19.071 Primary osteoarthritis, right ankle and foot
• M19.072 Primary osteoarthritis, left ankle and foot
• M19.079 Primary osteoarthritis, unspecified ankle and foot (this code)
• M19.09 Primary osteoarthritis, other specified site
• M19.1 Post-traumatic osteoarthritis of other joints
• M19.11 Post-traumatic osteoarthritis, shoulder
• M19.111 Post-traumatic osteoarthritis, right shoulder
• M19.112 Post-traumatic osteoarthritis, left shoulder