ICD-10 Diagnosis Code M65.9

Synovitis and tenosynovitis, unspecified

Diagnosis Code M65.9

ICD-10: M65.9
Short Description: Synovitis and tenosynovitis, unspecified
Long Description: Synovitis and tenosynovitis, unspecified
This is the 2018 version of the ICD-10-CM diagnosis code M65.9

Valid for Submission
The code M65.9 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Disorders of synovium and tendon (M65-M67)
      • Synovitis and tenosynovitis (M65)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code M65.9 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Chronic synovitis
  • Disorder of peroneal tendon
  • Extensor carpi radialis tenosynovitis
  • Extensor digitorum longus tenosynovitis
  • Extensor hallucis longus tenosynovitis
  • Infectious synovitis
  • Peroneal tendinitis
  • Peroneal tenosynovitis
  • Shoulder joint inflamed
  • Shoulder synovitis
  • Synovitis
  • Synovitis acne pustulosis hyperostosis osteomyelitis syndrome
  • Synovitis and tenosynovitis
  • Synovitis and/or tenosynovitis - ankle and/or foot
  • Synovitis AND/OR tenosynovitis associated with another disease
  • Synovitis of ankle
  • Synovitis of elbow
  • Synovitis of joint of left knee
  • Synovitis of knee
  • Tendinitis AND/OR tenosynovitis
  • Tendinitis AND/OR tenosynovitis of the foot region
  • Tendinitis AND/OR tenosynovitis of the pelvic region
  • Tendon sheath crepitus
  • Tenosynovitis

Information for Patients

Joint Disorders

A joint is where two or more bones come together, like the knee, hip, elbow, or shoulder. Joints can be damaged by many types of injuries or diseases, including

  • Arthritis - inflammation of a joint. It causes pain, stiffness, and swelling. Over time, the joint can become severely damaged.
  • Bursitis - inflammation of a fluid-filled sac that cushions the joint
  • Dislocations - injuries that force the ends of the bones out of position

Treatment of joint problems depends on the cause. If you have a sports injury, treatment often begins with the RICE (Rest, Ice, Compression, and Elevation) method to relieve pain, reduce swelling, and speed healing. Other possible treatments include pain relievers, keeping the injured area from moving, rehabilitation, and sometimes surgery. For arthritis, injuries, or other diseases, you may need joint replacement surgery to remove the damaged joint and put in a new one.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

  • Hypermobile joints (Medical Encyclopedia)
  • Joint pain (Medical Encyclopedia)
  • Joint swelling (Medical Encyclopedia)
  • Joint x-ray (Medical Encyclopedia)
  • Limited range of motion (Medical Encyclopedia)
  • Steroid injections - tendon, bursa, joint (Medical Encyclopedia)



Also called: Tendonitis

Tendons are flexible bands of tissue that connect muscles to bones. They help your muscles move your bones. Tendinitis is the severe swelling of a tendon.

Tendinitis usually happens after repeated injury to an area such as the wrist or ankle. It causes pain and soreness around a joint. Some common forms of tendinitis are named after the sports that increase their risk. They include tennis elbow, golfer's elbow, pitcher's shoulder, swimmer's shoulder, and jumper's knee.

Doctors diagnose tendinitis with your medical history, a physical exam, and imaging tests. The first step in treatment is to reduce pain and swelling. Rest, wrapping or elevating the affected area, and medicines can help. Ice is helpful for recent, severe injuries. Other treatments include ultrasound, physical therapy, steroid injections, and surgery.

  • Achilles tendinitis (Medical Encyclopedia)
  • De Quervain tendinitis (Medical Encyclopedia)
  • Rotator cuff problems (Medical Encyclopedia)
  • Tendinitis (Medical Encyclopedia)
  • Tennis elbow (Medical Encyclopedia)
  • Tenosynovitis (Medical Encyclopedia)
  • What Are Bursitis and Tendinitis? - NIH - Easy-to-Read (National Institute of Arthritis and Musculoskeletal and Skin Diseases)

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