ICD-10 I09.0
Billable / Specific CCRheumatic myocarditis
About ICD-10-CM I09.0
ICD-10-CM code I09.0 represents Rheumatic myocarditis. This is a billable/specific code in the Circulatory System chapter (block I09). The 2026 edition of ICD-10-CM I09.0 became effective on October 1, 2025.
Coding Tips for I09.0
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
I09.0 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Type 1 Excludes
Pure excludes, these codes can never be coded together with I09.0. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- myocarditis not specified as rheumatic (I51.4)
Inpatient DRG Impact, CC
codes Rheumatic myocarditis. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for I09.0
Local Coverage Determinations (LCDs) from CMS MACs that list I09.0 as a covered diagnosis.
Showing top 10 of 308 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing I09.0.
2 Aetna
2 Cigna
5 Medicare
CPT Codes Commonly Billed with I09.0
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 I09.0 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 |
|---|---|---|
| I09.0 | 3980 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To I09.0
Other codes in section I05-I09 (Chronic rheumatic heart diseases).
ICD-10 I09.0, Billing FAQ
Is ICD-10 code I09.0 billable? +
Yes, I09.0 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What codes are Type 1 Excludes for I09.0? +
Type 1 Excludes (never code together with I09.0): myocarditis not specified as rheumatic (I51.4)
Is I09.0 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What ICD-9 codes does I09.0 map to? +
Per CMS GEMs, I09.0 maps to ICD-9 codes: 3980. 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 June 1, 2026.
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