2026 ICD-10-CM Diagnosis Code M32.19Other organ or system involvement in systemic lupus erythematosus
ICD-10-CM Codes›M00–M99›M30-M36›SLE
- Billable — Valid for Submission
- Risk Adjusts — HCC 94
- Chronic Condition
M32.19 is a billable ICD-10-CM diagnosis code for other organ or system 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Systemic lupus erythematosus and connective tissue disorders.
For Medicare Advantage risk adjustment, M32.19 maps to CMS-HCC Category 94 (Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders) under the V28 model, adding a risk factor of about 0.268 for a community, non-dual, aged beneficiary in payment year 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
M32.19 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2026.
Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Cerebral arteritis
- Cerebral arteritis in systemic vasculitis
- Cheilitis due to lupus erythematosus
- Dementia due to systemic lupus erythematosus
- Demyelination of central nervous system co-occurrent and due to systemic lupus erythematosus
- Disorder of gastrointestinal tract due to systemic lupus erythematosus
- Joint disorder due to systemic lupus erythematosus
- Lupus vasculitis
- Meningitis due to systemic lupus erythematosus
- Myelitis due to systemic lupus erythematosus
- Myopathy due to disseminated lupus erythematosus
- Neuropsychiatric disorder due to systemic lupus erythematosus
- Retinal vasculitis due to systemic lupus erythematosus
- Secondary systemic vasculitis
- Systemic lupus erythematosus encephalitis
- Vasculitis due to systemic disease
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Use Additional Code
- codes to identify organ or system involvement, such as encephalitis G05.3
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 M32.19 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M32.19Overview
What is the ICD-10 code for other organ or system involvement in systemic lupus erythematosus?
The ICD-10-CM code for other organ or system involvement in systemic lupus erythematosus is M32.19 (sometimes written as M3219). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is M32.19 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other organ or system involvement in systemic lupus erythematosus on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does M32.19 group to?
When other organ or system 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 M32.19?
Under the General Equivalence Mappings, other organ or system involvement in systemic lupus erythematosus converts to ICD-9-CM 710.0 (syst lupus erythematosus). The mapping is approximate, so confirm the match fits the documentation.
What HCC is M32.19?
M32.19 (other organ or system involvement in systemic lupus erythematosus) maps to CMS-HCC Category 94 (Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders), commonly written as HCC 94, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2026. It mapped to HCC 40 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 84.
Does M32.19 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, M32.19 adds a risk adjustment factor of about 0.268 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.196 to 0.297 depending on the payment segment). A more severe related category (HCC 93) supersedes it when both are reported. See the full factor table on the HCC 94 category page.
