ICD-10 Guide

A01.00

Typhoid fever, unspecified

BILLABLE STATUSYes

IMPLEMENTATION DATEOctober 1, 2015

LAST UPDATED09/17/2025

Code Description

ICD-10 A01.00 is a billable code used to indicate a diagnosis of typhoid fever, unspecified.

Key Diagnostic Point:

Typhoid fever, unspecified

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

Laboratory confirmation required for definitive diagnosis
Clinical differentiation from other febrile illnesses needed
Assessment of potential complications and severity
Documentation of exposure history and risk factors

Audit Risk Factors

Laboratory test documentation
Clinical symptom assessment
Travel and exposure history
Treatment response monitoring

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Laboratory confirmation with blood culture or serology, clinical presentation with fever and systemic symptoms, travel or exposure history

Common Clinical Scenarios

Patients with prolonged fever, gastrointestinal symptoms, and potential travel to endemic areas requiring diagnostic workup

Billing Considerations

Document diagnostic testing, clinical assessment, and treatment planning for appropriate reimbursement

Emergency Medicine

Documentation Requirements

Initial assessment of febrile illness, blood cultures obtained, appropriate isolation precautions if indicated

Common Clinical Scenarios

Emergency department evaluation of patients with fever and suspected typhoid based on clinical presentation

Billing Considerations

Document emergency department evaluation level and diagnostic procedures performed

Coding Guidelines

Inclusion Criteria

Use A01.00 When

Comprehensive Coding Guidelines for ICD
10 Code A01
Typhoid Fever, Unspecified
Overview
10 code A01
00 refers to "Typhoid fever, unspecified
" This diagnosis is a type of enteric fever caused by the bacterium Salmonella typhi
This code is used when the specific details of the condition are not provided, and further specification is not available

Exclusion Criteria

Do NOT use A01.00 When

Inclusion and Exclusion Criteria
Exclusion Criteria:

Related CPT Codes

87045CPT Code

Culture, bacterial, any source

Clinical Scenario

Blood culture for isolation of Salmonella typhi

Documentation Requirements

Document clinical indication and source of culture

Specialty Considerations

Essential for definitive diagnosis

86768CPT Code

Antibody, Salmonella

Clinical Scenario

Serological testing for typhoid fever when culture is negative

Documentation Requirements

Document clinical indication for serological testing

Specialty Considerations

Used when blood culture is not available or negative

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

Changes from ICD-9 to ICD-10

- In ICD-9, typhoid fever was classified under code 002.0, which provided limited specificity. The transition to ICD-10 introduced A01.0, which allows for a more detailed classification of typhoid fever, including subdivisions for different manifestations and complications.

ICD-9 vs ICD-10

The implementation of ICD-10 has brought significant changes to the coding of diseases, including typhoid fever, which is represented by code A01.00 - Typhoid fever, unspecified. Below are the key aspects regarding the impact of ICD-10 implementation on this particular code: Changes from ICD-9 to ICD-10 1. Code Structure: - In ICD-9, typhoid fever was classified under code 002.0, which provided limited specificity. The transition to ICD-10 introduced A01.0, which allows for a more detailed classification of typhoid fever, including subdivisions for different manifestations and complications. 2. Expanded Coding: - ICD-10 provides a broader range of codes that offer more detail about the condition. While A01.00 is for unspecified cases, other codes within the A01 category allow for better differentiation between various types of typhoid and paratyphoid fevers. Specificity Improvements - Increased Detail: - ICD-10 allows for enhanced specificity compared to ICD-9. While A01.00 refers to unspecified typhoid fever, the...

Reimbursement & Billing Impact

Reimbursement Implications - Impact on Claims Processing: - The transition to ICD-10 has implications for reimbursement. Payers may have different policies regarding reimbursement for more specific coding. More precise codes can lead to appropriate reimbursement for complex cases that require more extensive treatment. Conversely, using unspecified codes like A01.00 may not capture the full scope of care provided, potentially leading to lower reimbursement. - Denial Management: - Claims with broad or unspecified codes are more prone to denials or requests for additional documentation. Providers may need to demonstrate medical necessity through more detailed coding to support their claims.

Resources

Clinical References

•
CDC Typhoid Fever Information
•
WHO Typhoid Guidelines

Coding & Billing References

•
CDC Typhoid Fever Information
•
WHO Typhoid Guidelines

Frequently Asked Questions

What is the difference between A01.00 and other A01 codes?

A01.00 is used for typhoid fever when the specific manifestation is not specified, while other A01 codes are for specific complications like meningitis (A01.01) or pneumonia (A01.03).

What documentation is required for A01.00?

Documentation should include clinical presentation, laboratory confirmation or strong clinical suspicion, travel history, and treatment provided.