Secondary osteoarthritis, other specified site

This code signifies osteoarthritis that develops as a consequence of another underlying condition, rather than arising spontaneously. It specifically applies when the affected joint is not one of the commonly specified sites (e.g., knee, hip, shoulder) but is still a distinct, identified location.

Use this code for patients diagnosed with secondary osteoarthritis in a joint such as the ankle, wrist, or elbow, where the primary cause (e.g., trauma, inflammatory arthritis, metabolic disorder) is documented. Documentation should clearly state "secondary osteoarthritis" and specify the affected joint.

• Always code the underlying primary condition causing the secondary osteoarthritis first.
• Do not use this code for primary osteoarthritis; use the appropriate M17-M19 codes for primary forms.
• Ensure the medical record specifies the exact joint affected to support "other specified site."