ICD-10 Diagnosis Code M65

Synovitis and tenosynovitis

Diagnosis Code M65

ICD-10: M65
Short Description: Synovitis and tenosynovitis
Long Description: Synovitis and tenosynovitis
This is the 2017 version of the ICD-10-CM diagnosis code M65

Code Classification
  • Diseases of the musculoskeletal system and connective tissue
    • Disorders of synovium and tendon (M65-M67)
      • Synovitis and tenosynovitis (M65)

Information for Patients


If you feel pain and stiffness in your body or have trouble moving around, you might have arthritis. Most kinds of arthritis cause pain and swelling in your joints. Joints are places where two bones meet, such as your elbow or knee. Over time, a swollen joint can become severely damaged. Some kinds of arthritis can also cause problems in your organs, such as your eyes or skin.

Types of arthritis include

  • Osteoarthritis is the most common type of arthritis. It's often related to aging or to an injury.
  • Autoimmune arthritis happens when your body's immune system attacks healthy cells in your body by mistake. Rheumatoid arthritis is the most common form of this kind of arthritis.
  • Juvenile arthritis is a type of arthritis that happens in children.
  • Infectious arthritis is an infection that has spread from another part of the body to the joint.
  • Psoriatic arthritis affects people with psoriasis.
  • Gout is a painful type of arthritis that happens when too much uric acid builds up in the body. It often starts in the big toe.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

  • Arthritis
  • Osteotomy of the knee

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Connective Tissue Disorders

Connective tissue is the material inside your body that supports many of its parts. It is the "cellular glue" that gives your tissues their shape and helps keep them strong. It also helps some of your tissues do their work. Cartilage and fat are examples of connective tissue.

There are over 200 disorders that impact connective tissue. Some, like cellulitis, are the result of an infection. Injuries can cause connective tissue disorders, such as scars. Others, such as Ehlers-Danlos syndrome, Marfan syndrome, and osteogenesis imperfecta, are genetic. Still others, like scleroderma, have no known cause. Each disorder has its own symptoms and needs different treatment.

  • Dupuytrens contracture

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