M17.11 – Unilateral primary osteoarthritis, right knee

Learn about M17.11, the ICD-10-CM code for unilateral primary osteoarthritis in the right knee, its clinical features, synonyms, and related codes.

By Karina Jimenea on Jul 16, 2025.

Fact Checked by Gale Alagos.

M17.11 diagnosis code: Unilateral primary osteoarthritis, right knee

M17.11 represents unilateral primary osteoarthritis affecting the right knee classified under disorders of the musculoskeletal system and connective tissue.
Involves age-related wear and tear of the knee joint
A degenerative joint disease characterized by the breakdown of cartilage and underlying bone
Common symptoms include pain, stiffness, swelling, and reduced range of motion
Diagnosis typically involves physical examination, patient history, and imaging studies (e.g., X-rays or MRI)
Risk factors include age, obesity, genetics, previous knee injuries, and repetitive stress on the knee joint

Yes, this is a billable code that can be used for billing and reimbursement.

M17.11 diagnosis code refers to primary osteoarthritis affecting only the right knee. It develops naturally over time due to joint wear and tear, rather than from an injury or underlying condition.
Management may begin with conservative treatments such as weight loss to reduce joint pressure, physical therapy to improve strength and flexibility, assistive devices like canes or knee braces for support, and medications like NSAIDs or corticosteroid injections to manage pain and inflammation.
If symptoms worsen or these methods are no longer effective, surgical options may be considered, including arthroscopy to clean the joint, osteotomy to realign the bones, or partial/total knee replacement to restore joint function.

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