ICD-10 M32.13
Billable / Specific HCC v28: 112Lung involvement in systemic lupus erythematosus
About ICD-10-CM M32.13
ICD-10-CM code M32.13 represents Lung involvement in systemic lupus erythematosus. This is a billable/specific code in the Musculoskeletal and Connective Tissue chapter (block M32). The 2026 edition of ICD-10-CM M32.13 became effective on October 1, 2025.
Coding Tips for M32.13
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
M32.13 is a CMS-HCC v28 risk-adjustment code (category 112). To count for the patient Risk Adjustment Factor (RAF), document the diagnosis with MEAT language each calendar year: Monitored, Evaluated, Assessed, Treated. A diagnosis on the problem list alone does not satisfy CMS RADV audit standards. Include the diagnosis in the assessment with current status and current treatment plan.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under M32.13. Per CMS ICD-10-CM Tabular 2026.
- Pleural effusion due to systemic lupus erythematosus
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Medicare LCD Coverage for M32.13
Local Coverage Determinations (LCDs) from CMS MACs that list M32.13 as a covered diagnosis.
Showing top 10 of 411 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing M32.13.
1 Cigna
5 Medicare
CPT Codes Commonly Billed with M32.13
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert M32.13 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| M32.13 | 5178 | 10112 |
| M32.13 | 7100 | 10111 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To M32.13
Other codes in section M30-M36 (Systemic connective tissue disorders).
ICD-10 M32.13, Billing FAQ
Is ICD-10 code M32.13 billable? +
Yes, M32.13 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to M32.13? +
ICD-10 M32.13 includes: Pleural effusion due to systemic lupus erythematosus.
Does M32.13 affect Medicare Advantage HCC risk adjustment? +
Yes. M32.13 maps to CMS-HCC v28 category 112. Capture this diagnosis annually for accurate Medicare Advantage risk score.
What ICD-9 codes does M32.13 map to? +
Per CMS GEMs, M32.13 maps to ICD-9 codes: 5178, 7100. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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