M33.12 – Other dermatomyositis with myopathy

ICD-10-CM 2027 diagnosis code · Systemic connective tissue disorders

Billable code

ICD-10-CM code M33.12

Code: M33.12 (claims format: M3312)
Description: Other dermatomyositis with myopathy
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M30-M36 Systemic connective tissue disorders
Parent codes: M33 › M33.1

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

M33.1 – Other dermatomyositis

Applicable to:

Adult dermatomyositis

Block M30-M36

Includes:

autoimmune disease NOS
collagen (vascular) disease NOS
systemic autoimmune disease
systemic collagen (vascular) disease

Excludes1 (not coded here):

autoimmune disease, single organ or single cell-type -code to relevant condition category

Index terms for M33.12

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in M33.1

Frequently asked questions

What is ICD-10 code M33.12?

M33.12 is the ICD-10-CM code for other dermatomyositis with myopathy, in the block M30-M36 (Systemic connective tissue disorders).

Is M33.12 a billable code?

Yes. M33.12 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does M33.12 belong to?

It belongs to category M33 – Dermatopolymyositis.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.