Primary osteoarthritis, unspecified ankle and foot

This code signifies the presence of degenerative joint disease, specifically primary osteoarthritis, affecting an unspecified ankle or foot joint. It indicates the breakdown of cartilage and underlying bone in the ankle or foot without a known secondary cause like trauma or inflammatory arthritis.

Apply this code when documentation confirms a diagnosis of primary osteoarthritis in either the ankle or foot, but the specific joint (e.g., talocrural, subtalar, metatarsophalangeal) is not specified. This is appropriate when the physician's notes clearly state "primary osteoarthritis of the ankle and foot" without further anatomical detail.

• Only use this code when the laterality (right/left) and specific joint within the ankle/foot are truly unspecified in the medical record.
• Avoid using this code if documentation specifies a particular ankle or foot joint (e.g., M19.071 for right ankle).
• Ensure the "primary" etiology is documented; otherwise, consider codes for secondary osteoarthritis (M19.1-).