2026 ICD-10-CM Diagnosis Code M34.9Systemic sclerosis, unspecified

ICD-10-CM Codes›M00–M99›M30-M36›M34

ICD-10-CM M34.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M34.9 is a billable ICD-10-CM diagnosis code for systemic sclerosis, unspecified. 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
M34.9
Billable Status
Yes — Valid for Submission
Code Describes
Systemic sclerosis, unspecified
Short Description
Systemic sclerosis, unspecified
Same as the full description in the CMS dataset.
Parent Code
M34
Systemic sclerosis [scleroderma]

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM30-M36Systemic connective tissue disorders
CategoryM34Systemic sclerosis [scleroderma]
This CodeM34.9Systemic sclerosis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Autoimmune cholangitis
  • Autoimmune hepatitis
  • Autoimmune liver disease
  • Biliary cirrhosis
  • Cardiomyopathy due to connective tissue disease
  • Cholangiohepatitis
  • Cutaneous complication of systemic sclerosis
  • Dilated cardiomyopathy due to scleroderma
  • Dilated cardiomyopathy due to systemic sclerosis
  • Fibrosis of bile duct
  • Gingival disease due to systemic sclerosis
  • Glomerulonephritis co-occurrent and due to scleroderma
  • Hypermelanosis due to connective tissue disorder
  • Hypothyroidism due to scleroderma
  • Hypothyroidism due to systemic sclerosis
  • Limited systemic sclerosis
  • Necrotizing vasculitis secondary to connective tissue disease
  • Occupational scleroderma
  • Pediatric onset systemic sclerosis
  • Pericarditis secondary to scleroderma
  • Poikiloderma due to scleroderma
  • Post-infectious scleredema
  • Primary biliary cholangitis
  • Progressive systemic sclerosis
  • Renal involvement in scleroderma
  • Reynolds syndrome
  • Scleredema
  • Sclerema
  • Scleroderma
  • Scleroderma-associated calcinosis
  • Scleroderma-associated hypermelanosis
  • Scleroderma-associated nail dystrophy
  • Scleroderma-associated nailfold telangiectasia
  • Scleroderma-associated necrotizing vasculitis
  • Scleroderma-associated telangiectasia
  • Systemic sclerosis
  • Systemic sclerosis with limited cutaneous involvement
  • Systemic sclerosis, diffuse
  • Telangiectasia of nailfolds
  • Thickening of skin

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.

    • Scleroderma, sclerodermia(acrosclerotic) (diffuse) (generalized) (progressive) (pulmonary)
    • Scleroderma, sclerodermia(acrosclerotic) (diffuse) (generalized) (progressive) (pulmonary)
      • systemic
    • Sclerosis, sclerotic
      • systemic
    • Trophoneurosis NEC
      • disseminated

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

Patient EducationClinical

Scleroderma

Scleroderma means "hard skin." It's the name of an autoimmune disease that causes inflammation and thickening in the skin and other areas of the body. This inflammation causes you to have areas of tight, hard skin. Scleroderma may affect just one area of your body, or it can affect many systems in your body.

The full article covers:

  • What is scleroderma?
  • What are the types of scleroderma?
  • What causes scleroderma?
  • Who is more likely to develop scleroderma?
  • What are the symptoms of scleroderma?
  • How is scleroderma diagnosed?
  • What are the treatments for scleroderma?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert M34.9 to ICD-9-CMHistory

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

ICD-9-CM
710.1 Systemic sclerosis
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M34.9Overview

Is M34.9 (Systemic sclerosis [scleroderma]) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report systemic sclerosis, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M34.9 group to?

When systemic sclerosis, unspecified 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 M34.9?

Under the General Equivalence Mappings, systemic sclerosis, unspecified converts to ICD-9-CM 710.1 (systemic sclerosis). 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.