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v1.0.0
ICD-10 Guide
DiagnosesLung Nodule

Lung Nodule

ICD-10 Coding for Lung Nodule(R91.1, R91.8, R91.9)

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

Diagnosis Overview

What is Lung Nodule?
Essential facts and insights about Lung Nodule

Key Clinical Considerations:

  • Asymptomatic or symptoms such as cough, hemoptysis, or chest pain
  • Chest X-ray or CT scan showing a solitary pulmonary nodule
  • Normal breath sounds, possible localized wheezing

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including smoking status and exposure to risk factors
  • Descriptive terminology for nodule size, shape, and margins
  • Radiology report detailing imaging findings and recommendations

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for coding based on nodule characteristics.
  • Common errors include misclassifying nodule type or size.

Code Exclusions

Important Exclusions

  • Lung cancer (C34.9), benign lung tumors (D14.3)
  • Alternative codes for other pulmonary conditions

Related ICD-10 Codes

Primary Codes
R91.1
Solitary pulmonary nodule
Ancillary Codes
Z87.891
R91.1
for patients with a history of smoking.
Differential Codes
C34.-
C34
.- if malignancy is confirmed through biopsy or other diagnostic methods.
R91.1
R91.1
if only a single nodule is present.
R91.8
R91.8
if multiple nodules are specified.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Radiology

Specialty Applications

  • Adults, smokers, individuals with a history of lung disease
  • Outpatient radiology settings, inpatient hospital settings

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

Documentation requirements?

Include detailed imaging findings and patient history.

Billing considerations?

Ensure correct coding based on imaging modality and findings.