What does ICD-10 code B58 mean?

ICD-10 code B58 is the standardized code used for toxoplasmosis in medical records and coding systems.

When is ICD-10 code B58 used?

Doctors, hospitals, and insurers may use ICD-10 code B58 when recording toxoplasmosis in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code B58 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code B58: Toxoplasmosis

Name: ICD-10 Code B58: Toxoplasmosis
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:01:26.478Z

B58 is an ICD-10 diagnosis entry used to group records related to Toxoplasmosis. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

When is it used?

May be used when a clinician documents toxoplasmosis in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

1Certain infectious and parasitic diseases (A00-B99)

block

B50-B64Protozoal diseases

currentB50-B64

Official coding notes

Includes

infection due to Toxoplasma gondii

Excludes1 (do not code together)

congenital toxoplasmosis (P37.1)

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

Infectious Disease SpecialistGeneral Physician

Sibling codes

B50Plasmodium falciparum malaria B51Plasmodium vivax malaria B52Plasmodium malariae malaria B53Other specified malaria B54Unspecified malariabillable B55Leishmaniasis B56African trypanosomiasis B57Chagas' disease B59Pneumocystosisbillable B60Other protozoal diseases, not elsewhere classified B64Unspecified protozoal diseasebillable

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

B58

Replacement codes

B58.1 — Toxoplasma hepatitisB58.2 — Toxoplasma meningoencephalitisB58.3 — Pulmonary toxoplasmosisB58.9 — Toxoplasmosis, unspecified

Common synonyms

Toxoplasmosis

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.