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  5. Toxoplasmosis (B58)

Toxoplasmosis (B58)

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.

Instructional Notations

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

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

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.