2026 ICD-10-CM Diagnosis Code M32.13Lung involvement in systemic lupus erythematosus
ICD-10-CM Codes›M00–M99›M30-M36›SLE
- Billable — Valid for Submission
- Chronic Condition
M32.13 is a billable ICD-10-CM diagnosis code for lung involvement 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 lung disease due to connective tissue disorder. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Systemic lupus erythematosus and connective tissue disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Lung disease due to connective tissue disorder
- Lung disease with systemic lupus erythematosus
- Lung disorder due to autoimmune disorder
- Lupus disease of the lung
- Lupus pneumonitis
- Shrinking lung syndrome
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Pleural effusion due to systemic lupus erythematosus
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Disease, diseased - See Also: Syndrome;
- in
- systemic
- lupus erythematosus - M32.13
- Effusion
- Lupus
- erythematosus (discoid) (local) - L93.0
- with organ or system involvement - M32.10
- lung - M32.13
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Disease, diseased
- lung
- in
- systemic
- lupus erythematosus
- Effusion
- pleura, pleurisy, pleuritic, pleuropericardial
- due to systemic lupus erythematosis
- Lupus
- erythematosus (discoid) (local)
- systemic
- with organ or system involvement
- lung
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Lung Diseases
When you breathe, your lungs take in oxygen from the air and deliver it to the bloodstream. The cells in your body need oxygen to work and grow. During a normal day, you breathe nearly 25,000 times. People with lung disease have difficulty breathing. Millions of people in the U.S. have lung disease.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert M32.13 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M32.13Overview
Is M32.13 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report lung involvement in systemic lupus erythematosus on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does M32.13 group to?
When lung involvement 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 M32.13?
Under the General Equivalence Mappings, lung involvement in systemic lupus erythematosus converts to ICD-9-CM 710.0 (syst lupus erythematosus) and 517.8 (lung involv 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.
