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v1.0.0
ICD-10 Guide
DiagnosesModerate Persistent Asthma

Moderate Persistent Asthma

ICD-10 Coding for Moderate Persistent Asthma(J45.40, J45.41, J45.42)

PRIMARY SPECIALTYPulmonology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Moderate Persistent Asthma?
Essential facts and insights about Moderate Persistent Asthma

Key Clinical Considerations:

  • Symptoms occur daily and require inhaled short-acting beta-agonists (SABAs) for symptom control more than twice a week but not daily.
  • Lung function tests show FEV1 between 60% and 80% of predicted value.
  • Symptoms include wheezing, coughing, chest tightness, and shortness of breath.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document frequency and severity of symptoms, response to treatment, and any exacerbations.
  • Use specific terminology such as 'moderate persistent asthma' in clinical notes.
  • Examples include noting the patient's use of rescue inhalers and any hospitalizations due to asthma.

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for differentiating between mild, moderate, and severe asthma.
  • Common errors include misclassifying asthma severity and not documenting exacerbations.

Code Exclusions

Important Exclusions

  • Excludes other types of asthma such as mild intermittent or severe persistent asthma.
  • Alternative codes may include J45.909 for unspecified asthma.

Related ICD-10 Codes

Primary Codes
J45.2
Moderate persistent asthma
Ancillary Codes
Z79.51
J20.9
Differential Codes
J44.9
J44.9
if asthma type is unspecified and COPD is present.
J45.42
J45.42
if status asthmaticus is present, indicated by severe respiratory distress.
J45.41
J45.41
if exacerbation is present without status asthmaticus.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Pulmonology

Specialty Applications

  • Patients aged 5 years and older with a diagnosis of asthma.
  • Clinical settings include outpatient pulmonology clinics and emergency departments.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What are the documentation requirements?

Document the patient's asthma classification, treatment plan, and response to therapy.

What are the billing considerations?

Ensure accurate coding to reflect the severity of asthma for appropriate reimbursement.