ICD-10 Diagnosis Code M66.261

Spontaneous rupture of extensor tendons, right lower leg

Diagnosis Code M66.261

ICD-10: M66.261
Short Description: Spontaneous rupture of extensor tendons, right lower leg
Long Description: Spontaneous rupture of extensor tendons, right lower leg
This is the 2018 version of the ICD-10-CM diagnosis code M66.261

Valid for Submission
The code M66.261 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)
      • Spontaneous rupture of synovium and tendon (M66)

Information for Patients


Leg Injuries and Disorders

Your legs are made up of bones, blood vessels, muscles, and other connective tissue. They are important for motion and standing. Playing sports, running, falling, or having an accident can damage your legs. Common leg injuries include sprains and strains, joint dislocations, and fractures.

These injuries can affect the entire leg, or just the foot, ankle, knee, or hip. Certain diseases also lead to leg problems. For example, knee osteoarthritis, common in older people, can cause pain and limited motion. Problems in your veins in your legs can lead to varicose veins or deep vein thrombosis.

  • Blount disease (Medical Encyclopedia)
  • Bowlegs (Medical Encyclopedia)
  • Common peroneal nerve dysfunction (Medical Encyclopedia)
  • Femoral nerve dysfunction (Medical Encyclopedia)
  • Femur fracture repair - discharge (Medical Encyclopedia)
  • Foot, leg, and ankle swelling (Medical Encyclopedia)
  • Iliotibial band syndrome -- aftercare (Medical Encyclopedia)
  • Ischemic ulcers -- self-care (Medical Encyclopedia)
  • Knock knees (Medical Encyclopedia)
  • Leg pain (Medical Encyclopedia)
  • Shin splints - self-care (Medical Encyclopedia)
  • Tibial nerve dysfunction (Medical Encyclopedia)
  • Venous insufficiency (Medical Encyclopedia)


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Sprains and Strains

A sprain is a stretched or torn ligament. Ligaments are tissues that connect bones at a joint. Falling, twisting, or getting hit can all cause a sprain. Ankle and wrist sprains are common. Symptoms include pain, swelling, bruising, and being unable to move your joint. You might feel a pop or tear when the injury happens.

A strain is a stretched or torn muscle or tendon. Tendons are tissues that connect muscle to bone. Twisting or pulling these tissues can cause a strain. Strains can happen suddenly or develop over time. Back and hamstring muscle strains are common. Many people get strains playing sports. Symptoms include pain, muscle spasms, swelling, and trouble moving the muscle.

At first, treatment of both sprains and strains usually involves resting the injured area, icing it, wearing a bandage or device that compresses the area, and medicines. Later treatment might include exercise and physical therapy.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

  • Ankle sprain - aftercare (Medical Encyclopedia)
  • Elbow sprain -- aftercare (Medical Encyclopedia)
  • Foot sprain - aftercare (Medical Encyclopedia)
  • Hamstring strain - aftercare (Medical Encyclopedia)
  • Hip flexor strain -- aftercare (Medical Encyclopedia)
  • Sprains (Medical Encyclopedia)
  • Strains (Medical Encyclopedia)
  • Tendon repair (Medical Encyclopedia)
  • Wrist sprain - aftercare (Medical Encyclopedia)


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