ICD-10 Diagnosis Code M17.9

Osteoarthritis of knee, unspecified

Diagnosis Code M17.9

ICD-10: M17.9
Short Description: Osteoarthritis of knee, unspecified
Long Description: Osteoarthritis of knee, unspecified
This is the 2018 version of the ICD-10-CM diagnosis code M17.9

Valid for Submission
The code M17.9 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Osteoarthritis (M15-M19)
      • Osteoarthritis of knee (M17)

Information for Patients


Also called: Degenerative joint disease, OA, Osteoarthrosis

Osteoarthritis is the most common form of arthritis. It causes pain, swelling, and reduced motion in your joints. It can occur in any joint, but usually it affects your hands, knees, hips or spine.

Osteoarthritis breaks down the cartilage in your joints. Cartilage is the slippery tissue that covers the ends of bones in a joint. Healthy cartilage absorbs the shock of movement. When you lose cartilage, your bones rub together. Over time, this rubbing can permanently damage the joint.

Risk factors for osteoarthritis include

  • Being overweight
  • Getting older
  • Injuring a joint

No single test can diagnose osteoarthritis. Most doctors use several methods, including medical history, a physical exam, x-rays, or lab tests.

Treatments include exercise, medicines, and sometimes surgery.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

  • Osteoarthritis (Medical Encyclopedia)
  • What Is Osteoarthritis? - NIH - Easy-to-Read (National Institute of Arthritis and Musculoskeletal and Skin Diseases)

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