ICD-10 Diagnosis Code M33.99

Dermatopolymyositis, unsp with other organ involvement

Diagnosis Code M33.99

ICD-10: M33.99
Short Description: Dermatopolymyositis, unsp with other organ involvement
Long Description: Dermatopolymyositis, unspecified with other organ involvement
This is the 2017 version of the ICD-10-CM diagnosis code M33.99

Valid for Submission
The code M33.99 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Systemic connective tissue disorders (M30-M36)
      • Dermatopolymyositis (M33)

Information for Medical Professionals

Information for Patients


Myositis means inflammation of the muscles that you use to move your body. An injury, infection, or autoimmune disease can cause it. Two specific kinds are polymyositis and dermatomyositis. Polymyositis causes muscle weakness, usually in the muscles closest to the trunk of your body. Dermatomyositis causes muscle weakness, plus a skin rash.

Other symptoms of myositis may include

  • Fatigue after walking or standing
  • Tripping or falling
  • Trouble swallowing or breathing

Doctors may use a physical exam, lab tests, imaging tests and a muscle biopsy to diagnose myositis. There is no cure for these diseases, but you can treat the symptoms. Polymyositis and dermatomyositis are first treated with high doses of a corticosteroid. Other options include medications, physical therapy, exercise, heat therapy, assistive devices, and rest.

NIH: National Institute of Neurological Disorders and Stroke

  • Creatine phosphokinase test
  • Dermatomyositis
  • Polymyositis - adult

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