ICD-10 Diagnosis Code M65.4

Radial styloid tenosynovitis [de Quervain]

Diagnosis Code M65.4

ICD-10: M65.4
Short Description: Radial styloid tenosynovitis [de Quervain]
Long Description: Radial styloid tenosynovitis [de Quervain]
This is the 2018 version of the ICD-10-CM diagnosis code M65.4

Valid for Submission
The code M65.4 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 M65.4 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.
  • 727.04 - Radial styloid tenosynov

  • Inflammation of extensor pollicis longus muscle tendon
  • Radial styloid tenosynovitis

Information for Patients

Hand Injuries and Disorders

No matter how old you are or what you do for a living, you are always using your hands. When there is something wrong with them, you may not be able to do your regular activities.

Hand problems include

  • Carpal tunnel syndrome - compression of a nerve as it goes through the wrist, often making your fingers feel numb
  • Injuries that result in fractures, ruptured ligaments and dislocations
  • Osteoarthritis - wear-and-tear arthritis, which can also cause deformity
  • Tendinitis - irritation of the tendons
  • Disorders and injuries of your fingers and thumb

  • Brachial plexopathy (Medical Encyclopedia)
  • Claw hand (Medical Encyclopedia)
  • Dupuytrens contracture (Medical Encyclopedia)
  • Hand fracture - aftercare (Medical Encyclopedia)
  • Hand or foot spasms (Medical Encyclopedia)
  • Hand x-ray (Medical Encyclopedia)
  • Radial nerve dysfunction (Medical Encyclopedia)
  • Ulnar nerve dysfunction (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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