Unilateral primary osteoarthritis, right knee

This code identifies a degenerative joint disease affecting the right knee, characterized by cartilage breakdown and bone changes, without a known underlying cause. It specifies that only the right knee is affected by this primary form of osteoarthritis.

Apply this code when documentation clearly indicates primary osteoarthritis isolated to the right knee. This diagnosis is typically supported by imaging studies (e.g., X-rays showing joint space narrowing, osteophytes) and clinical findings such as pain, stiffness, and crepitus in the right knee.

• Ensure documentation explicitly states "primary" or "idiopathic" osteoarthritis and specifies the "right knee."
• Do not use this code if the osteoarthritis is secondary to trauma, infection, or another underlying condition; instead, refer to codes for secondary osteoarthritis.
• Verify laterality carefully; codes exist for the left knee and bilateral involvement.