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v1.0.0
ICD-10 Guide
ICD-10 CodesA37.9

A37.9

Whooping cough, unspecified

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

Code Description

ICD-10 A37.9 is a billable code used to indicate a diagnosis of whooping cough, unspecified.

Key Diagnostic Point:

Whooping cough, also known as pertussis, is a highly contagious bacterial infection caused by Bordetella pertussis. It primarily affects the respiratory system and is characterized by severe coughing fits that can lead to a 'whooping' sound during inhalation. The disease is particularly dangerous for infants and young children, who may experience complications such as pneumonia, seizures, and in severe cases, death. The incubation period for whooping cough is typically 7 to 10 days, and the illness progresses through three stages: catarrhal (mild symptoms), paroxysmal (intense coughing), and convalescent (gradual recovery). Diagnosis is often based on clinical presentation and can be confirmed through laboratory tests such as PCR or culture. Vaccination is the primary preventive measure, with the DTaP vaccine recommended for children and Tdap for adolescents and adults. Treatment usually involves antibiotics, which are most effective when administered early in the course of the disease. However, antibiotic resistance patterns have been observed, necessitating careful selection of treatment regimens.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation among different age groups
  • Need for accurate documentation of vaccination status
  • Differentiation from other respiratory infections
  • Potential for complications requiring additional coding

Audit Risk Factors

  • Inadequate documentation of symptoms and clinical findings
  • Failure to document vaccination history
  • Misdiagnosis or coding of related respiratory conditions
  • Inconsistent use of antibiotics in treatment documentation

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

Ensure accurate age documentation as infants are at higher risk for severe disease.

Infectious Disease

Documentation Requirements

Laboratory confirmation of pertussis and treatment response.

Common Clinical Scenarios

Outbreak investigations and management of pertussis in adults.

Billing Considerations

Document antibiotic resistance patterns and treatment adjustments.

Coding Guidelines

Inclusion Criteria

Use A37.9 When
  • According to ICD
  • 10 coding guidelines, A37
  • 9 should be used when the diagnosis of whooping cough is established but the specific type is not documented
  • It is important to ensure that the documentation supports the diagnosis and that any related conditions are also coded appropriately

Exclusion Criteria

Do NOT use A37.9 When
No specific exclusions found.

Related CPT Codes

99213CPT Code

Established patient office visit, Level 3

Clinical Scenario

Used for follow-up visits for whooping cough management.

Documentation Requirements

Document history of present illness, review of systems, 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 whooping cough, enabling better tracking of the disease and its complications. A37.9 serves as a catch-all for unspecified cases, but the availability of more specific codes encourages accurate documentation and coding practices.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of whooping cough, enabling better tracking of the disease and its complications. A37.9 serves as a catch-all for unspecified cases, but the availability of more specific codes encourages accurate documentation and coding practices.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of whooping cough, enabling better tracking of the disease and its complications. A37.9 serves as a catch-all for unspecified cases, but the availability of more specific codes encourages accurate documentation and coding practices.

Resources

Clinical References

  • •
    CDC Pertussis Information

Coding & Billing References

  • •
    CDC Pertussis Information

Frequently Asked Questions

What is the significance of coding A37.9?

Coding A37.9 is important for tracking whooping cough cases, especially in outbreak situations. Accurate coding helps in understanding the epidemiology of the disease and ensuring appropriate public health responses.