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ICD-10-CM Codes
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M00-M99
Diseases of the musculoskeletal system and connective tissue
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M30-M36
Systemic connective tissue disorders
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M33-
Dermatopolymyositis
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2021 ICD-10-CM Diagnosis Code M33.9
2021 ICD-10-CM Diagnosis Code M33.9
Dermatopolymyositis, unspecified
2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
- M33.9 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
- The 2021 edition of ICD-10-CM M33.9 became effective on October 1, 2020.
- This is the American ICD-10-CM version of M33.9 - other international versions of ICD-10 M33.9 may differ.
The following code(s) above
M33.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
- Applicable To annotations, or
- Code Also annotations, or
- Code First annotations, or
- Excludes1 annotations, or
- Excludes2 annotations, or
- Includes annotations, or
- Note annotations, or
- Use Additional annotations
that may be applicable to
M33.9:
Clinical Information
- A subacute or chronic inflammatory disease of muscle and skin, marked by proximal muscle weakness and a characteristic skin rash. The illness occurs with approximately equal frequency in children and adults. The skin lesions usually take the form of a purplish rash (or less often an exfoliative dermatitis) involving the nose, cheeks, forehead, upper trunk, and arms. The disease is associated with a complement mediated intramuscular microangiopathy, leading to loss of capillaries, muscle ischemia, muscle-fiber necrosis, and perifascicular atrophy. The childhood form of this disease tends to evolve into a systemic vasculitis. Dermatomyositis may occur in association with malignant neoplasms. (from Adams et al., Principles of Neurology, 6th ed, pp1405-6)
- An inflammatory muscle disease accompanied by muscle weakness and skin rash
- Progressive condition characterized by symmetric proximal muscular weakness with elevated serum levels of muscle enzymes and a skin rash, typically a purplish-red erythema on the face, and edema of the eyelids and periorbital tissue; affected muscle tissue shows degeneration of fibers with a chronic inflammatory reaction; occurs in children and adults, and in the latter may be associated with visceral cancer or other disorders of connective tissue.
Code History
- 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
- 2017 (effective 10/1/2016): No change
- 2018 (effective 10/1/2017): No change
- 2019 (effective 10/1/2018): No change
- 2020 (effective 10/1/2019): No change
- 2021 (effective 10/1/2020): No change
ICD-10-CM Codes Adjacent To M33.9
M33.10 …… organ involvement unspecified
M33.11 …… with respiratory involvement
M33.19 …… with other organ involvement
M33.20 …… organ involvement unspecified
M33.21 …… with respiratory involvement
M33.29 …… with other organ involvement
M33.9
Dermatopolymyositis, unspecified
M33.90 …… organ involvement unspecified
M33.91 …… with respiratory involvement
M33.99 …… with other organ involvement
M34 Systemic sclerosis [scleroderma]
M34.0 Progressive systemic sclerosis
M34.2 Systemic sclerosis induced by drug and chemical
M34.8 Other forms of systemic sclerosis
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.