ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesA37.91

A37.91

Whooping cough, unspecified species with pneumonia

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 A37.91 is a billable code used to indicate a diagnosis of whooping cough, unspecified species with pneumonia.

Key Diagnostic Point:

Whooping cough, or pertussis, is a highly contagious bacterial infection caused primarily by Bordetella pertussis. It is characterized by severe coughing fits that can lead to difficulty breathing, vomiting, and exhaustion. When accompanied by pneumonia, the condition can become more severe, particularly in infants and young children. The pneumonia associated with whooping cough can be due to the direct effects of the infection or secondary bacterial infections that arise as a complication. Diagnosis typically involves clinical evaluation, history of exposure, and laboratory confirmation through PCR testing or culture. Treatment usually includes antibiotics such as azithromycin or clarithromycin, which are most effective when administered early in the course of the illness. Vaccination is a key preventive measure, with the DTaP vaccine recommended for children and Tdap for adolescents and adults. Resistance patterns for Bordetella pertussis are not well-documented, but antibiotic resistance is a growing concern in other bacterial infections, necessitating careful selection of treatment protocols.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between unspecified species and specific species of Bordetella.
  • Identifying pneumonia as a complication of whooping cough.
  • Understanding the clinical presentation and severity of symptoms.
  • Navigating the documentation requirements for both the infection and pneumonia.

Audit Risk Factors

  • Inadequate documentation of pneumonia as a complication.
  • Failure to provide laboratory confirmation of whooping cough.
  • Misclassification of the causative organism.
  • Inconsistent coding of related respiratory conditions.

Specialty Focus

Medical Specialties

Pediatrics

Documentation Requirements

Detailed history of cough, vaccination status, and any complications.

Common Clinical Scenarios

Infants presenting with severe cough and difficulty breathing.

Billing Considerations

Documentation must clearly indicate the relationship between whooping cough and pneumonia.

Infectious Disease

Documentation Requirements

Laboratory results, treatment protocols, and follow-up care.

Common Clinical Scenarios

Patients with recurrent respiratory infections following whooping cough.

Billing Considerations

Need for comprehensive documentation of antibiotic resistance patterns.

Coding Guidelines

Inclusion Criteria

Use A37.91 When
  • According to ICD
  • 10 guidelines, A37
  • 91 should be used when whooping cough is confirmed and pneumonia is documented as a complication

Exclusion Criteria

Do NOT use A37.91 When
  • Exclusion criteria include cases where pneumonia is not directly related to whooping cough

Related CPT Codes

99213CPT Code

Established patient office visit, Level 3

Clinical Scenario

Used for follow-up visits after diagnosis of whooping cough with pneumonia.

Documentation Requirements

Document the patient's history, examination findings, and treatment plan.

Specialty Considerations

Pediatricians should ensure vaccination history is included.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like whooping cough, enabling better tracking of disease prevalence and treatment outcomes. A37.91 provides a clear indication of the presence of pneumonia, which is critical for treatment and epidemiological studies.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like whooping cough, enabling better tracking of disease prevalence and treatment outcomes. A37.91 provides a clear indication of the presence of pneumonia, which is critical for treatment and epidemiological studies.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of conditions like whooping cough, enabling better tracking of disease prevalence and treatment outcomes. A37.91 provides a clear indication of the presence of pneumonia, which is critical for treatment and epidemiological studies.

Resources

Clinical References

  • •
    CDC Pertussis Information

Coding & Billing References

  • •
    CDC Pertussis Information

Frequently Asked Questions

What is the significance of coding A37.91?

Coding A37.91 accurately reflects the presence of whooping cough with pneumonia, which is crucial for treatment planning and understanding the epidemiology of the disease.