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v1.0.0
ICD-10 Guide
ICD-10 CodesA43

A43

Scarlet fever

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

Code Description

ICD-10 A43 is a billable code used to indicate a diagnosis of scarlet fever.

Key Diagnostic Point:

Scarlet fever is an infectious disease caused by group A Streptococcus (Streptococcus pyogenes), characterized by a distinctive red rash, fever, and sore throat. It primarily affects children aged 5 to 15 years but can occur in individuals of any age. The disease is transmitted through respiratory droplets and can also spread via contaminated surfaces. The hallmark of scarlet fever is the 'strawberry tongue' appearance, along with a fine, sandpaper-like rash that typically begins on the neck and spreads to the trunk and extremities. In immunocompromised patients, the presentation may be atypical, and the risk of complications, such as rheumatic fever or post-streptococcal glomerulonephritis, is heightened. Diagnostic challenges arise due to overlapping symptoms with other conditions, such as viral exanthems or other bacterial infections. Accurate diagnosis often requires throat culture or rapid antigen detection tests to confirm the presence of Streptococcus pyogenes. Treatment typically involves antibiotics, which can mitigate symptoms and prevent complications if administered promptly.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between scarlet fever and other streptococcal infections.
  • Identifying atypical presentations in immunocompromised patients.
  • Need for laboratory confirmation of streptococcal infection.
  • Potential for complications requiring additional coding.

Audit Risk Factors

  • Inadequate documentation of laboratory results.
  • Failure to note immunocompromised status of the patient.
  • Misdiagnosis due to symptom overlap with other conditions.
  • Lack of detailed clinical notes regarding the rash and fever.

Specialty Focus

Medical Specialties

Pediatrics

Documentation Requirements

Thorough documentation of symptoms, laboratory results, and treatment plans.

Common Clinical Scenarios

Diagnosis of scarlet fever in children presenting with fever and rash.

Billing Considerations

Consideration of age-related variations in presentation and complications.

Infectious Disease

Documentation Requirements

Detailed history of exposure, symptom onset, and laboratory confirmation.

Common Clinical Scenarios

Management of scarlet fever in immunocompromised patients.

Billing Considerations

Need for careful monitoring of complications and atypical presentations.

Coding Guidelines

Inclusion Criteria

Use A43 When
  • Follow official ICD
  • 10 guidelines for infectious diseases, ensuring accurate documentation of symptoms and laboratory results
  • Include any relevant complications in coding

Exclusion Criteria

Do NOT use A43 When
No specific exclusions found.

Related Codes

Child Codes

4 codes
A43.0
Whooping cough due to Bordetella pertussis
A43.1
Sepsis due to anaerobes
A43.8
Other forms of endocarditis
A43.9
Scarlet fever, unspecified

Related CPT Codes

87070CPT Code

Culture, bacterial, any source

Clinical Scenario

Used when confirming streptococcal infection in suspected scarlet fever cases.

Documentation Requirements

Document the source of the culture and clinical symptoms.

Specialty Considerations

Pediatricians should ensure thorough documentation of symptoms and exposure history.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of scarlet fever, improving the ability to track and manage cases, especially in immunocompromised patients.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of scarlet fever, improving the ability to track and manage cases, especially in immunocompromised patients.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of scarlet fever, improving the ability to track and manage cases, especially in immunocompromised patients.

Resources

Clinical References

  • •
    CDC - Scarlet Fever

Coding & Billing References

  • •
    CDC - Scarlet Fever

Frequently Asked Questions

What are the common symptoms of scarlet fever?

Common symptoms include a red rash, fever, sore throat, and a 'strawberry tongue'.

How is scarlet fever diagnosed?

Diagnosis is typically made based on clinical presentation and confirmed with a throat culture or rapid antigen test.

What are the potential complications of scarlet fever?

Complications can include rheumatic fever and post-streptococcal glomerulonephritis, especially if untreated.