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Dermatomyositis N021

Last amended 
30 June 2015
Current RMA Instruments:
Reasonable Hypothesis SOP
9 of 2014
Balance of Probabilities SOP
10 of 2014
Changes from Previous Instruments:

SOP Bulletin 171

ICD Coding:
  • ICD-9-CM Codes: 710.3
  • ICD-10-AM Codes: M33.1

This is an autoimmune disease causing chronic progressive inflammation of both the skin and skeletal muscle.

Is specific diagnostic evidence required to apply the SOP? – No.

However, this is a complicated diagnosis and muscle biopsy may be required for a definitive diagnosis. The relevant specialist is a rheumatologist/physician, or for amyopathic dermatomyositis, a dermatologist.

Are there sub-factors that require specific information? – No.
Diagnoses covered by SOP
  • Dermatomyositis
  • Amyopathic dermatomyositis
Conditions excluded from SOP
  • Polymyositis
  • Eosinophilic myositis
  • Inclusion body myositis
Unconfirmed diagnosis

If, after applying the above information, you are unable to confirm the diagnosis, you should then seek medical officer advice about further investigation.