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M32.9 ICD-10-CM Code: Systemic lupus erythematosus, unspecified

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
7 inclusion terms · 2 Excludes1
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 40 · RxHCC V08 category 84

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43, Appendix B.

  • MS-DRG 545 — CONNECTIVE TISSUE DISORDERS WITH MCC (MDC 08)
  • MS-DRG 546 — CONNECTIVE TISSUE DISORDERS WITH CC (MDC 08)
  • MS-DRG 547 — CONNECTIVE TISSUE DISORDERS WITHOUT CC/MCC (MDC 08)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 94 — Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders

Other models: CMS-HCC V22 HCC 40 · RxHCC V08 HCC 84

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for M32.9 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on M32.9 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • autoimmune disease NOS
  • collagen (vascular) disease NOS
  • systemic autoimmune disease
  • systemic collagen (vascular) disease

Source: inherited from M30-M36

Inclusion Terms

Alternative terms the tabular list files under this code.

  • SLE NOS
  • Systemic lupus erythematosus NOS
  • Systemic lupus erythematosus without organ involvement

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

  • lupus erythematosus (discoid) (NOS) (L93.0) inherited from M32Compare M32.9 vs L93.0 →
  • autoimmune disease, single organ or single cell-type -code to relevant condition category inherited from M30-M36

Coder workflow for M32.9

MedCoder structured workflow — derived from this code’s own official record

Before you code M32.9

  1. Unspecified does not mean incorrect. When the record gives no greater specificity, M32.9 may be the appropriate code. Check the record for detail that supports a more specific sibling. An unspecified code is for records that do not provide the detail a more specific code needs; a query, not an assumption, is the route to specificity (Guidelines I.A.9.b, I.B.18).

    ReviewM32.0, M32.1, M32.8

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with M32.9. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the record document the detail a more specific sibling code needs?
    Yes → Review the specific siblings in this subcategory.
    No → Continue — M32.9 is appropriate when the documentation goes no further.

    ReviewM32.0, M32.1, M32.8

  2. Does the documentation support a condition named in M32.9’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewL93.0

Consider M32.9. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
Any detail beyond this code’s title
What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes1 — check before selecting M32.9(2 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with M32.9: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareL93.0

    See the official tabular notes · Guidelines I.A.12.a

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: The provider documents the condition in the terms of this code’s title and records no further detail.

Coding question: Is a more specific sibling code supportable?

Path: Review the specific siblings in this subcategory and what each requires the record to state.

Reason: A more specific code needs documentation of the distinguishing element; without it the unspecified code is appropriate, and a provider query is the route to specificity (Guidelines I.A.9.b, I.B.18).

ReviewM32.0, M32.1, M32.8

Documentation: Both the condition M32.9 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewL93.0

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Code Overview

Systemic lupus erythematosus, unspecified is a billable ICD-10-CM diagnosis code (M32.9).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Indexed Clinical Terms (3)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name M32.9 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 7 Excludes1 notes across 2 chapters: L93 — Lupus erythematosus (via M32.-), L94 — Other localized connective tissue disorders (via M32.-), M60 — Myositis (via M32.-), M60-M63 — Disorders of muscles (M60-M63) (via M32.-), M61 — Calcification and ossification of muscle (via M32.-), M62 — Other disorders of muscle (via M32.-), M63 — Disorders of muscle in diseases classified elsewhere (via M32.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 3 Excludes2 notes across 3 chapters: A18.4 — Tuberculosis of skin and subcutaneous tissue (via M32.-), I77 — Other disorders of arteries and arterioles (via M32.-), J82 — Pulmonary eosinophilia, not elsewhere classified (via M32.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 4 Code First instructions across 2 chapters: F02 — Dementia in other diseases classified elsewhere (via M32.-), F06.7 — Mild neurocognitive disorder due to known physiological condition (via M32.-), J84.170 — Interstitial lung disease with progressive fibrotic phenotype in diseases classified elsewhere (via M32.-), J84.178 — Other interstitial pulmonary diseases with fibrosis in diseases classified elsewhere.

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Referenced by 1 Code Also instruction: D59.39 — Other hemolytic-uremic syndrome (via M32.-).

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 3 MS-DRGs: DRG 545 (MDC 08), DRG 546 (MDC 08), DRG 547 (MDC 08).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):MUS024 — Systemic lupus erythematosus and connective tissue disorders (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders) for risk-adjusted payment.

M12.079 — Chronic postrheumatic arthropathy [Jaccoud], unspecified ankle and foot, M12.08 — Chronic postrheumatic arthropathy [Jaccoud], other specified site, M12.09 — Chronic postrheumatic arthropathy [Jaccoud], multiple sites, M30.0 — Polyarteritis nodosa, M30.2 — Juvenile polyarteritis, M30.8 — Other conditions related to polyarteritis nodosa, M31.5 — Giant cell arteritis with polymyalgia rheumatica, M31.6 — Other giant cell arteritis, M31.7 — Microscopic polyangiitis, M31.8 — Other specified necrotizing vasculopathies, M31.9 — Necrotizing vasculopathy, unspecified, M32.10 — Systemic lupus erythematosus, organ or system involvement unspecified, M32.11 — Endocarditis in systemic lupus erythematosus, M32.12 — Pericarditis in systemic lupus erythematosus, M32.13 — Lung involvement in systemic lupus erythematosus, M32.14 — Glomerular disease in systemic lupus erythematosus, M32.15 — Tubulo-interstitial nephropathy in systemic lupus erythematosus, M32.19 — Other organ or system involvement in systemic lupus erythematosus, M32.8 — Other forms of systemic lupus erythematosus, M35.2 — Behçet's disease, +50 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Systemic lupus erythematosus and connective tissue disorders).

M31.9 — Necrotizing vasculopathy, unspecified, M32.0 — Drug-induced systemic lupus erythematosus, M32.10 — Systemic lupus erythematosus, organ or system involvement unspecified, M32.11 — Endocarditis in systemic lupus erythematosus, M32.12 — Pericarditis in systemic lupus erythematosus, M32.13 — Lung involvement in systemic lupus erythematosus, M32.14 — Glomerular disease in systemic lupus erythematosus, M32.15 — Tubulo-interstitial nephropathy in systemic lupus erythematosus, M32.19 — Other organ or system involvement in systemic lupus erythematosus, M32.8 — Other forms of systemic lupus erythematosus, M33.00 — Juvenile dermatomyositis, organ involvement unspecified, M33.01 — Juvenile dermatomyositis with respiratory involvement, M33.02 — Juvenile dermatomyositis with myopathy, M33.03 — Juvenile dermatomyositis without myopathy, M33.09 — Juvenile dermatomyositis with other organ involvement, M33.10 — Other dermatomyositis, organ involvement unspecified, M33.11 — Other dermatomyositis with respiratory involvement, M33.12 — Other dermatomyositis with myopathy, M33.13 — Other dermatomyositis without myopathy, M33.19 — Other dermatomyositis with other organ involvement, +72 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Phenomenon”, “System, systemic”, “Lupus”; these codes share that main term but sit in a different category of the Tabular List.

D86.3 — Sarcoidosis of skin (pernio), H01.121 — Discoid lupus erythematosus of right upper eyelid (erythematosus, eyelid, right, upper), H01.122 — Discoid lupus erythematosus of right lower eyelid (erythematosus, eyelid, right, lower), H01.123 — Discoid lupus erythematosus of right eye, unspecified eyelid (erythematosus, eyelid, right), H01.124 — Discoid lupus erythematosus of left upper eyelid (erythematosus, eyelid, left, upper), H01.125 — Discoid lupus erythematosus of left lower eyelid (erythematosus, eyelid, left, lower), H01.126 — Discoid lupus erythematosus of left eye, unspecified eyelid (erythematosus, eyelid, left), H01.129 — Discoid lupus erythematosus of unspecified eye, unspecified eyelid (erythematosus, eyelid), I44.1 — Atrioventricular block, second degree (Wenckebach's), I73.00 — Raynaud's syndrome without gangrene (Raynaud's), I73.01 — Raynaud's syndrome with gangrene (Raynaud's, with gangrene), I73.9 — Peripheral vascular disease, unspecified (vasospastic), L93.0 — Discoid lupus erythematosus (discoid), L93.1 — Subacute cutaneous lupus erythematosus (erythematosus, subacute cutaneous), L93.2 — Other local lupus erythematosus (panniculitis), Q07.8 — Other specified congenital malformations of nervous system (jaw-winking), R55 — Syncope and collapse (vasomotor), R65.10 — Systemic inflammatory response syndrome (SIRS) of non-infectious origin without acute organ dysfunction (inflammatory response syndrome), R65.11 — Systemic inflammatory response syndrome (SIRS) of non-infectious origin with acute organ dysfunction (inflammatory response syndrome, with acute organ dysfunction), R76.0 — Raised antibody titer (anticoagulant, finding without diagnosis), +3 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Partial Thromboplastin Time (PTT) Test, Thyroid Stimulating Hormone (TSH)

Contextual Map

Every relationship of M32.9 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run M32.9 with these 15 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes

Referenced by Code First instructions

Referenced by Code Also instructions

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 94 — Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders [CMS-HCC]— CMS-HCC V28 · 2026

MS-DRG Grouper

MDC crossing

  • MDC 08 — Diseases and Disorders of the Musculoskeletal System and Connective Tissue[MDC crossing]: “Diseases and Disorders of the Musculoskeletal System and Connective Tissue — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 18,508 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

  • Lupus, erythematosus (discoid) (local), systemic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Phenomenon, lupus erythematosuscell (LE)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • System, systemic, lupus erythematosus[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (11)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page
Risk adjustment Official source data
2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "M32.9 — Systemic lupus erythematosus, unspecified." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/m32.9-systemic-lupus-erythematosus-unspecified

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Systemic lupus erythematosus, unspecified

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to M32.9 in its code family, with their registry titles.

View all codes in the M32 family