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v1.0.0
ICD-10 Guide
ICD-10 CodesA31.1

A31.1

Pulmonary mycobacterial infection

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

Code Description

ICD-10 A31.1 is a billable code used to indicate a diagnosis of pulmonary mycobacterial infection.

Key Diagnostic Point:

Pulmonary mycobacterial infection refers to infections of the lungs caused by non-tuberculous mycobacteria (NTM), which are environmental organisms found in soil and water. The most common species associated with pulmonary infections include Mycobacterium avium complex (MAC), Mycobacterium kansasii, and Mycobacterium abscessus. These infections can occur in individuals with underlying lung disease, such as chronic obstructive pulmonary disease (COPD) or cystic fibrosis, and in immunocompromised patients. Symptoms may include chronic cough, hemoptysis, weight loss, and fatigue. Diagnosis typically involves a combination of clinical evaluation, imaging studies (such as chest X-rays or CT scans), and microbiological testing, including culture and molecular methods. Treatment often requires prolonged antibiotic therapy, typically involving a combination of macrolides, rifamycins, and ethambutol, tailored to the specific mycobacterial species and susceptibility patterns. Resistance to treatment can occur, necessitating careful monitoring and potential adjustment of therapy.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of mycobacterial species involved
  • Need for specific microbiological testing
  • Potential for co-infection with other pathogens
  • Variability in treatment regimens based on susceptibility

Audit Risk Factors

  • Inadequate documentation of diagnostic criteria
  • Failure to specify the mycobacterial species
  • Lack of evidence for underlying lung disease
  • Inconsistent treatment documentation

Specialty Focus

Medical Specialties

Pulmonology

Documentation Requirements

Detailed clinical history, imaging results, and microbiological test results.

Common Clinical Scenarios

Patients presenting with chronic cough and weight loss, suspected NTM infections.

Billing Considerations

Ensure accurate species identification and treatment response monitoring.

Infectious Disease

Documentation Requirements

Comprehensive review of patient history, including immunocompromised status and previous infections.

Common Clinical Scenarios

Management of complex cases with multiple comorbidities and resistance patterns.

Billing Considerations

Document rationale for antibiotic choices and adjustments based on susceptibility testing.

Coding Guidelines

Inclusion Criteria

Use A31.1 When
  • Follow official coding guidelines for specificity in diagnosis
  • Include documentation of the mycobacterial species when available
  • Ensure that underlying conditions are well
  • documented to support the diagnosis

Exclusion Criteria

Do NOT use A31.1 When
No specific exclusions found.

Related CPT Codes

87070CPT Code

Culture for mycobacteria

Clinical Scenario

Used when a patient presents with symptoms suggestive of pulmonary mycobacterial infection.

Documentation Requirements

Document the reason for the culture and any prior treatments.

Specialty Considerations

Pulmonologists should ensure that cultures are sent for specific mycobacterial identification.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of mycobacterial infections, improving the accuracy of data collection and treatment tracking.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of mycobacterial infections, improving the accuracy of data collection and treatment tracking.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of mycobacterial infections, improving the accuracy of data collection and treatment tracking.

Resources

Clinical References

  • •
    CDC Mycobacteria Information

Coding & Billing References

  • •
    CDC Mycobacteria Information

Frequently Asked Questions

What is the primary cause of pulmonary mycobacterial infections?

Pulmonary mycobacterial infections are primarily caused by non-tuberculous mycobacteria, particularly Mycobacterium avium complex, which are found in the environment.