2026 ICD-10-CM Diagnosis Code M32.12Pericarditis in systemic lupus erythematosus

ICD-10-CM Codes›M00–M99›M30-M36›SLE

ICD-10-CM M32.12
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M32.12 is a billable ICD-10-CM diagnosis code for pericarditis in systemic lupus erythematosus. 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. Coders also document this condition as pericarditis secondary to systemic lupus erythematosus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pericarditis and pericardial disease and Systemic lupus erythematosus and connective tissue disorders.

Code Identity

ICD-10-CM Code
M32.12
Billable Status
Yes — Valid for Submission
Code Describes
Pericarditis in systemic lupus erythematosus
Short Description
Pericarditis in systemic lupus erythematosus
Same as the full description in the CMS dataset.
Parent Code
M32.1
Systemic lupus erythematosus with organ or system involvement

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM30-M36Systemic connective tissue disorders
CategorySLESystemic lupus erythematosus (M32)
This CodeM32.12Pericarditis in systemic lupus erythematosus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Pericarditis secondary to systemic lupus erythematosus
  • Systemic lupus erythematosus with pericarditis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Lupus pericarditis

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.

    • Lupus
      • erythematosus (discoid) (local)
        • systemic
          • with organ or system involvement
            • pericarditis
    • Pericarditis(with decompensation) (with effusion)
      • in systemic lupus erythematosus

Clinical ClassificationClinical

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

CCSR CIR006
Pericarditis and pericardial disease
Default principal diagnosis: inpatient No · outpatient No
CCSR MUS024
Systemic lupus erythematosus and connective tissue disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Lupus

Lupus is a chronic (long-lasting) type of autoimmune disease.Autoimmune diseases happen when your immune system attacks healthy cells and tissues by mistake. This attack causes inflammation. It can also damage many parts of the body, including the joints, skin, kidneys, heart, lungs, and brain.

The full article covers:

  • What is lupus?
  • What causes lupus?
  • Who is more likely to get lupus?
  • What are the symptoms of lupus?
  • What other problems can lupus cause?
  • How is lupus diagnosed?
  • What are the treatments for lupus?
  • How can I cope with lupus?

Read the full article at MedlinePlus

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

Convert M32.12 to ICD-9-CMHistory

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

ICD-9-CM
710.0 Syst lupus erythematosus
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
420.0 Ac pericardit in oth dis
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

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 M32.12Overview

Is M32.12 a billable code?

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

What MS-DRG does M32.12 group to?

When pericarditis in systemic lupus erythematosus 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 M32.12?

Under the General Equivalence Mappings, pericarditis in systemic lupus erythematosus converts to ICD-9-CM 710.0 (syst lupus erythematosus) and 420.0 (ac pericardit in oth dis). 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.