M33.12 — Other dermatomyositis with myopathy
Is M33.12 billable?
Yes — M33.12 is billable for FY2027. M33.12 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. M33.12 may be submitted for encounters from October 1, 2026 through September 30, 2027.
M33.12 at a glance
| Code | M33.12 |
|---|---|
| Description | Other dermatomyositis with myopathy |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does M33.12 group to?
M33.12 sits in MDC 08 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 545Connective Tissue Disorders with MCCmedical
- 546Connective Tissue Disorders with CCmedical
- 547Connective Tissue Disorders without CC/MCCmedical
As a secondary diagnosis, M33.12 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is M33.12 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to M33.12. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Dermatomucosomyositis › with › myopathy
- Dermatopolymyositis › specified NEC › myopathy
- Poikilodermatomyositis › with › myopathy
- Dermatomyositis › specified NEC › with › myopathy (acute) (chronic)
Excludes1 — never code together — inherited from M30-M36
The conditions below can never be reported together with M33.12 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- autoimmune disease, single organ or single cell-type -code to relevant condition category
Excludes2 — not included here — inherited from Chapter 13
The conditions below are not part of M33.12, but a patient may have both at the same time. When documentation supports it, M33.12 and the excluded code may both be reported.
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
How long has M33.12 existed?
M33.12 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
- FY2018Other dermatopolymyositis with myopathyOther dermatomyositis with myopathy
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.