B58 vs P37.1
B58 (Toxoplasmosis) compared with P37.1 (Congenital toxoplasmosis), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. B58 carries an Excludes1 note covering P37.1: “congenital toxoplasmosis (P37.1)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| B58Toxoplasmosis | P37.1Congenital toxoplasmosis | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96) |
| Definition | Toxoplasmosis is a non-billable ICD-10-CM category code (B58). | Congenital toxoplasmosis is a billable ICD-10-CM diagnosis code (P37.1). |
| Includes | infection due to Toxoplasma gondii | Hydrocephalus due to congenital toxoplasmosis |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources