2027 ICD-10-CM Diagnosis Code B58Toxoplasmosis

ICD-10-CM Codes›A00–B99›B50-B64›B58

ICD-10-CM B58
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B58 is a non-billable ICD-10-CM category code for toxoplasmosis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B58.00, B58.01, B58.09, and B58.1.

Code Identity

ICD-10-CM Code
B58
Billable Status
No — Non-Billable Category
Code Describes
Toxoplasmosis
Short Description
Toxoplasmosis
Same as the full description in the CMS dataset.
Chapter
B50-B64
Protozoal diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB50-B64Protozoal diseases
CategoryB58Toxoplasmosis
This CodeB58Toxoplasmosis

Specific Coding for ToxoplasmosisOverview

Non-specific codes like B58 require more characters. Use one of these billable codes instead:

  • B58.0 for Toxoplasma oculopathy

  • Use B58.00 for Toxoplasma oculopathy, unspecified

  • Use B58.01 for Toxoplasma chorioretinitis

  • Use B58.09 for Other toxoplasma oculopathy

  • Use B58.1 for Toxoplasma hepatitis

  • Use B58.2 for Toxoplasma meningoencephalitis

  • Use B58.3 for Pulmonary toxoplasmosis

  • B58.8 for Toxoplasmosis with other organ involvement

  • Use B58.81 for Toxoplasma myocarditis

  • Use B58.82 for Toxoplasma myositis

  • Use B58.83 for Toxoplasma tubulo-interstitial nephropathy

  • Use B58.89 for Toxoplasmosis with other organ involvement

  • Use B58.9 for Toxoplasmosis, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B58: its own notes plus those printed at block B50-B64 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

On B58 itself
  • infection due to Toxoplasma gondii
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On B58 itself
  • congenital toxoplasmosis (P37.1)
From Block B50-B64 Protozoal diseases applies to 57 codes
  • amebiasis (A06.-)
  • other protozoal intestinal diseases (A07.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name B58, its category, or a range that includes it.

Applicable To 1

These notes mention B58.

  • O98.6 Protozoal diseases complicating pregnancy, childbirth and the puerperium
    Conditions in B50-B64 names B50-B64, which includes this code

Clinical InformationClinical

  • Toxoplasmosis

    the acquired form of infection by toxoplasma gondii in animals and man.

Patient EducationClinical

Toxoplasmosis

Toxoplasmosis is a disease caused by the parasite Toxoplasma gondii. More than 60 million people in the U.S. have the parasite. Most of them don't get sick. But the parasite causes serious problems for some people. These include people with weak immune systems and babies whose mothers become infected for the first time during pregnancy.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About B58Overview

What is the ICD-10 code for toxoplasmosis?

B58 is the ICD-10-CM category for toxoplasmosis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is B58 (Toxoplasmosis) a billable code?

No. This is a category header that groups the codes for toxoplasmosis, and headers cannot be submitted on claims. Claims for toxoplasmosis need a more specific code from this category, such as B58.00, B58.01, and B58.09.

Can B58 be reported with P37.1?

Not as a rule. The Excludes1 note on B58 lists "congenital toxoplasmosis (P37.1)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).