P37.1 Congenital toxoplasmosis

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applicable to

• Hydrocephalus due to congenital toxoplasmosis

Applies from P37 Other congenital infectious and parasitic diseases

Excludes2 (not included here)

• congenital syphilis (A50.-)
• infectious neonatal diarrhea (A00-A09)
• necrotizing enterocolitis in newborn (P77.-)
• noninfectious neonatal diarrhea (P78.3)
• ophthalmia neonatorum due to gonococcus (A54.31)
• tetanus neonatorum (A33)

MS-DRG index

Defines the logic of DRG(s) 791 in MDC 15.

Approximate ICD-9-CM (GEMs)

• 771.2 Other congenital infections specific to the perinatal period (approximate)

Code annotations containing back-references to P37.1

Back-references to P37.1

• Type 1 Excludes: B58 Toxoplasmosis ("congenital toxoplasmosis (P37.1)")
• Code First: G05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere ("congenital toxoplasmosis encephalitis, myelitis and encephalomyelitis (P37.1)")
• Type 1 Excludes: G91.4 Hydrocephalus in diseases classified elsewhere ("hydrocephalus due to congenital toxoplasmosis (P37.1)")
• Code First: H32 Chorioretinal disorders in diseases classified elsewhere ("congenital toxoplasmosis (P37.1)")
• Code First: K77 Liver disorders in diseases classified elsewhere ("congenital toxoplasmosis (P37.1)")
• Type 1 Excludes: Q03 Congenital hydrocephalus ("hydrocephalus due to congenital toxoplasmosis (P37.1)")

Back-references to P37

• Type 2 Excludes: P00.2 Newborn affected by maternal infectious and parasitic diseases ("infections specific to the perinatal period (P35-P39)")

Diagnosis Index entries for P37.1

• Chorioretinitis › in (due to) › toxoplasmosis (acquired) › congenital (active)
• Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › in (due to) › toxoplasmosis (acquired) › congenital
• Hepatitis › in (due to) › toxoplasmosis (acquired) › congenital (active)
• Hydrocephalus (acquired) (external) (internal) (malignant) (recurrent) › due to toxoplasmosis (congenital)
• Infection, infected, infective (opportunistic) › congenital › toxoplasmosis (acute) (subacute) (chronic)
• Lymphadenopathy (generalized) › due to toxoplasmosis (acquired) › congenital (acute) (subacute) (chronic)
• Meningoencephalitis › in (due to) › toxoplasmosis (acquired) › congenital
• Meningoencephalomyelitis › due to › Toxoplasma or toxoplasmosis (acquired) › congenital
• Microcephalus, microcephalic, microcephaly › due to toxoplasmosis (congenital)
• Microphthalmos, microphthalmia (congenital) › due to toxoplasmosis
• Pneumonitis (acute) (primary) › due to › toxoplasmosis (acquired) › congenital
• Toxoplasma, toxoplasmosis (acquired) › congenital (acute) (subacute) (chronic)
• Toxoplasma, toxoplasmosis (acquired) › maternal, manifest toxoplasmosis in infant (acute) (subacute) (chronic)
• Uveitis (anterior) › due to toxoplasmosis (acquired) › congenital

Nearby codes

• P37 Other congenital infectious and parasitic diseases
• P37.0 Congenital tuberculosis
• P37.1 Congenital toxoplasmosis (this code)
• P37.2 Neonatal (disseminated) listeriosis
• P37.3 Congenital falciparum malaria
• P37.4 Other congenital malaria
• P37.5 Neonatal candidiasis
• P37.8 Other specified congenital infectious and parasitic diseases