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v1.0.0
ICD-10 Guide
ICD-10 CodesA07.9

A07.9

Protozoal intestinal disease, unspecified

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/04/2025

Code Description

ICD-10 A07.9 is a billable code used to indicate a diagnosis of protozoal intestinal disease, unspecified.

Key Diagnostic Point:

This code is used for unspecified protozoal infections affecting the intestines, which can lead to gastrointestinal symptoms such as diarrhea, abdominal pain, and nausea.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of protozoal pathogens
  • Potential for overlapping symptoms with other gastrointestinal diseases

Audit Risk Factors

    Specialty Focus

    Medical Specialties

    Infectious Disease

    Documentation Requirements

    Detailed patient history, laboratory test results, and symptomatology.

    Common Clinical Scenarios

    Patients presenting with diarrhea and abdominal pain after travel to endemic areas.

    Billing Considerations

    Consideration of recent travel history and exposure to contaminated food or water.

    Coding Guidelines

    Inclusion Criteria

    Use A07.9 When
    • Use this code when the specific protozoal organism is not identified or documented
    • If known, use the specific code for the organism

    Exclusion Criteria

    Do NOT use A07.9 When
    No specific exclusions found.

    Related CPT Codes

    87449CPT Code

    Infectious agent detection by nucleic acid (DNA or RNA); gastrointestinal pathogen, multiplex

    Clinical Scenario

    Testing for multiple gastrointestinal pathogens in a patient with diarrhea.

    Documentation Requirements

    Document the clinical rationale for testing and any relevant symptoms.

    Specialty Considerations

    Infectious disease specialists may require additional details on travel history.

    ICD-10 Impact

    Diagnostic & Documentation Impact

    Enhanced Specificity

    ICD-10 Improvements

    The introduction of this code allows for better tracking and management of protozoal infections, which can be critical for public health.

    ICD-9 vs ICD-10

    The introduction of this code allows for better tracking and management of protozoal infections, which can be critical for public health.

    Reimbursement & Billing Impact

    The introduction of this code allows for better tracking and management of protozoal infections, which can be critical for public health.

    Resources

    Clinical References

    • •
      CDC - Parasites

    Coding & Billing References

    • •
      CDC - Parasites

    Frequently Asked Questions

    What should I document to support the use of A07.9?

    Document the patient's symptoms, travel history, and any laboratory tests performed to rule out other conditions.