ICD-10 I00
Billable / SpecificRheumatic fever without heart involvement
About ICD-10-CM I00
ICD-10-CM code I00 represents Rheumatic fever without heart involvement. This is a billable/specific code in the Circulatory System chapter (block I00). The 2026 edition of ICD-10-CM I00 became effective on October 1, 2025.
Type 1 Excludes
Pure excludes, these codes can never be coded together with I00. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- rheumatic fever with heart involvement (I01.0 -I01.9)
Includes
- arthritis, rheumatic, acute or subacute
Medicare LCD Coverage for I00
Local Coverage Determinations (LCDs) from CMS MACs that list I00 as a covered diagnosis.
Showing top 6. Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing I00.
1 Medicare
CPT Codes Commonly Billed with I00
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 I00 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 |
|---|---|---|
| I00 | 390 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To I00
Other codes in section I00-I02 (Acute rheumatic fever).
ICD-10 I00, Billing FAQ
Is ICD-10 code I00 billable? +
Yes, I00 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 I00? +
Type 1 Excludes (never code together with I00): rheumatic fever with heart involvement (I01.0 -I01.9)
What ICD-9 codes does I00 map to? +
Per CMS GEMs, I00 maps to ICD-9 codes: 390. 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 2, 2026.
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