I00 vs J12
I00 (Rheumatic fever without heart involvement) compared with J12 (Viral pneumonia, not elsewhere classified), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. J12 carries an Excludes2 note covering I00: “rheumatic pneumonia (I00)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| I00Rheumatic fever without heart involvement | J12Viral pneumonia, not elsewhere classified | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | I00-I99 — Diseases of the Circulatory System (I00-I99) | J00-J99 — Diseases of the Respiratory System (J00-J99) |
| Definition | Rheumatic fever without heart involvement is a billable ICD-10-CM diagnosis code (I00). | Viral pneumonia, not elsewhere classified is a non-billable ICD-10-CM category code (J12). |
| Includes | arthritis, rheumatic, acute or subacute | bronchopneumonia due to viruses other than influenza viruses |
| Use additional code | — | code, if applicable, to identify resistance to antimicrobial drugs (Z16.-) |
| Code first | — | associated influenza, if applicable (J09.X1, J10.0-, J11.0-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources