2026 ICD-10-CM Diagnosis Code M33.93Dermatopolymyositis, unspecified without myopathy

ICD-10-CM Codes›M00–M99›M30-M36›M33

ICD-10-CM M33.93
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M33.93 is a billable ICD-10-CM diagnosis code for dermatopolymyositis, unspecified without myopathy. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 545 through 547. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Systemic lupus erythematosus and connective tissue disorders.

Code Identity

ICD-10-CM Code
M33.93
Billable Status
Yes — Valid for Submission
Code Describes
Dermatopolymyositis, unspecified without myopathy
Short Description
Dermatopolymyositis, unspecified without myopathy
Same as the full description in the CMS dataset.
Parent Code
M33.9
Dermatopolymyositis, unspecified

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM30-M36Systemic connective tissue disorders
CategoryM33Dermatopolymyositis
This CodeM33.93Dermatopolymyositis, unspecified without myopathy

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Dermatopolymyositis
      • amyopathic
    • Dermatopolymyositis
      • without myopathy

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS024
Systemic lupus erythematosus and connective tissue disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert M33.93 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
710.3 Dermatomyositis
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement M33.93 replaces the following previously assigned code(s):

  • M33.90 - Dermatopolymyositis, unsp, organ involvement unspecified
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M33.93Overview

Is M33.93 (Dermatopolymyositis, unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report dermatopolymyositis, unspecified without myopathy on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M33.93 group to?

When dermatopolymyositis, unspecified without myopathy is the principal diagnosis on an inpatient stay, it groups to MS-DRG 545, 546, 547, with relative weights from 0.8362 to 2.4817 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M33.93?

Under the General Equivalence Mappings, dermatopolymyositis, unspecified without myopathy converts to ICD-9-CM 710.3 (dermatomyositis). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.