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v1.0.0
ICD-10 Guide
ICD-10 CodesP37.1

P37.1

Billable

Congenital toxoplasmosis

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/11/2025

Code Description

ICD-10 P37.1 is a billable code used to indicate a diagnosis of congenital toxoplasmosis.

Key Diagnostic Point:

Congenital toxoplasmosis is an infection caused by the parasite Toxoplasma gondii, which can be transmitted from an infected mother to her fetus during pregnancy. This condition is characterized by a range of clinical manifestations that may include chorioretinitis, hydrocephalus, intracranial calcifications, and other neurological deficits. The severity of symptoms can vary widely, with some infants presenting with severe manifestations at birth, while others may appear asymptomatic initially but develop complications later. Diagnosis is typically made through serological testing of the mother and/or the infant, and imaging studies may be utilized to assess for neurological involvement. Early detection and management are crucial to mitigate long-term developmental issues. Treatment often involves the use of pyrimethamine and sulfadiazine, along with folinic acid to prevent bone marrow suppression. Given the potential for significant morbidity associated with congenital toxoplasmosis, awareness and accurate coding are essential for appropriate clinical management and resource allocation.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation among affected infants
  • Need for serological confirmation and imaging studies
  • Differentiation from other congenital infections
  • Potential for late-onset symptoms requiring ongoing monitoring

Audit Risk Factors

  • Inadequate documentation of maternal infection status
  • Failure to document all clinical manifestations in the newborn
  • Misclassification of symptoms as unrelated conditions
  • Lack of follow-up documentation for late-onset symptoms

Specialty Focus

Medical Specialties

Neonatology

Documentation Requirements

Detailed documentation of clinical findings, diagnostic tests, and treatment plans is essential. Neonatologists should ensure that all manifestations of the condition are recorded.

Common Clinical Scenarios

Infants presenting with chorioretinitis or neurological symptoms in the NICU, requiring multidisciplinary management.

Billing Considerations

Consideration of the timing of maternal infection and its impact on infant outcomes is crucial for accurate coding.

Pediatrics

Documentation Requirements

Pediatricians should document developmental assessments and any late-onset complications that may arise.

Common Clinical Scenarios

Follow-up visits for infants diagnosed with congenital toxoplasmosis, monitoring for developmental milestones and potential complications.

Billing Considerations

Awareness of the long-term implications of congenital toxoplasmosis on child development is important for accurate coding and management.

Coding Guidelines

Inclusion Criteria

Use P37.1 When
  • According to ICD
  • 10 coding guidelines, congenital toxoplasmosis should be coded based on the clinical manifestations present at the time of diagnosis
  • Coders should ensure that all relevant clinical details are documented to support the diagnosis

Exclusion Criteria

Do NOT use P37.1 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

86778CPT Code

Toxoplasma antibody test

Clinical Scenario

Used to confirm maternal infection during pregnancy or assess infant status postnatally.

Documentation Requirements

Document the indication for testing and results to support coding.

Specialty Considerations

Neonatologists should ensure that testing is performed in a timely manner to facilitate early intervention.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of congenital conditions, including congenital toxoplasmosis. This specificity aids in better tracking of incidence and outcomes, ultimately improving patient care and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of congenital conditions, including congenital toxoplasmosis. This specificity aids in better tracking of incidence and outcomes, ultimately improving patient care and resource allocation.

Reimbursement & Billing Impact

reimbursement.

Resources

Clinical References

  • •
    CDC Toxoplasmosis Information

Coding & Billing References

  • •
    CDC Toxoplasmosis Information

Frequently Asked Questions

What are the long-term effects of congenital toxoplasmosis?

Long-term effects can include vision problems, developmental delays, and neurological issues. Early diagnosis and treatment can help mitigate some of these complications.