Toxoplasmosis (B58) ICD-10-CM
The B58 code range covers toxoplasmosis with 14 ICD-10-CM diagnosis codes. 11 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- infection due to Toxoplasma gondii
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- congenital toxoplasmosis P37.1
Codes in the B58 Range 14 codes · 11 billable
- B58 ToxoplasmosisNon-billable
- B58.0 Toxoplasma oculopathyNon-billable
- B58.00 Toxoplasma oculopathy, unspecified
- B58.01 Toxoplasma chorioretinitis
- B58.09 Other toxoplasma oculopathy
- B58.1 Toxoplasma hepatitis
- B58.2 Toxoplasma meningoencephalitis
- B58.3 Pulmonary toxoplasmosis
- B58.8 Toxoplasmosis with other organ involvementNon-billable
- B58.81 Toxoplasma myocarditis
- B58.82 Toxoplasma myositis
- B58.83 Toxoplasma tubulo-interstitial nephropathy
- B58.89 Toxoplasmosis with other organ involvement
- B58.9 Toxoplasmosis, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B58 range.
Toxoplasma
A genus of protozoa parasitic to birds and mammals. T. gondii is one of the most common infectious pathogenic animal parasites of man.
Toxoplasmosis
The acquired form of infection by Toxoplasma gondii in animals and man.
Toxoplasmosis, Animal
Acquired infection of non-human animals by organisms of the genus TOXOPLASMA.
Toxoplasmosis, Cerebral
Infections of the BRAIN caused by the protozoan TOXOPLASMA gondii that primarily arise in individuals with IMMUNOLOGIC DEFICIENCY SYNDROMES (see also AIDS-RELATED OPPORTUNISTIC INFECTIONS). The infection may involve the brain diffusely or form discrete abscesses. Clinical manifestations include SEIZURES, altered mentation, headache, focal neurologic deficits, and INTRACRANIAL HYPERTENSION. (From Joynt, Clinical Neurology, 1998, Ch27, pp41-3)
Toxoplasmosis, Congenital
Prenatal protozoal infection with TOXOPLASMA gondii which is associated with injury to the developing fetal nervous system. The severity of this condition is related to the stage of pregnancy during which the infection occurs; first trimester infections are associated with a greater degree of neurologic dysfunction. Clinical features include HYDROCEPHALUS; MICROCEPHALY; deafness; cerebral calcifications; SEIZURES; and psychomotor retardation. Signs of a systemic infection may also be present at birth, including fever, rash, and hepatosplenomegaly. (From Adams et al., Principles of Neurology, 6th ed, p735)
Toxoplasmosis, Ocular
Infection caused by the protozoan parasite TOXOPLASMA in which there is extensive connective tissue proliferation, the retina surrounding the lesions remains normal, and the ocular media remain clear. Chorioretinitis may be associated with all forms of toxoplasmosis, but is usually a late sequel of congenital toxoplasmosis. The severe ocular lesions in infants may lead to blindness.
About the B58 Code Range
ICD-10 code B58 and its subcategories are used to classify cases of toxoplasmosis, an infection caused by the parasite Toxoplasma gondii. These codes capture a range of organ-specific involvements, from eye disorders to systemic complications, providing precise coding for different clinical manifestations.
The ICD-10 code for toxoplasmosis includes detailed codes such as B58.00 for unspecified ocular toxoplasmosis (also known as ocular toxoplasmosis or disorder of eye caused by Toxoplasma gondii) and B58.01, which covers toxoplasma chorioretinitis—a retinal infection often described by terms like parasitic chorioretinitis or toxoplasma retinitis. Other codes specify involvement of organs like the liver (B58.1 for toxoplasma hepatitis), brain (B58.2 for toxoplasma meningoencephalitis), lungs (B58.3 for pulmonary toxoplasmosis), heart (B58.81 for toxoplasma myocarditis), muscles (B58.82 for toxoplasma myositis), kidneys (B58.83 for toxoplasma tubulo-interstitial nephropathy), or other organs (B58.89). The unspecified code B58.9 is used when the diagnosis is confirmed but the site is not specified. This coding allows healthcare professionals to document and report toxoplasmosis infections accurately for clinical and administrative purposes.
Questions About This Page
How many billable codes are in the B58 range?
Of the 14 codes in this range, 11 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the B58 range classify?
The range classifies toxoplasmosis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
