Pulmonology is one of the most technically demanding specialties in healthcare billing.

Unlike many office-based specialties, pulmonary practices often combine evaluation and management services with diagnostic testing performed during the same encounter.

A single pulmonology visit may include:

• Asthma or COPD management
• Spirometry
• Pulmonary function testing (PFT)
• Bronchodilator testing
• Oxygen therapy evaluation
• Sleep-related assessments
• Medication adjustments
• Imaging review
• Chronic respiratory disease monitoring

Each component requires accurate coding.

A claim must communicate:

• What service was performed
• Why the service was medically necessary
• How complex the clinical decision-making was
• Whether diagnostic testing was properly documented
• Where the service occurred
• Whether Medicare requirements were satisfied

The biggest billing challenges in pulmonology usually involve:

1. Office and E/M coding
2. Spirometry and pulmonary function testing
3. Place of Service (POS)
4. Medicare compliance requirements

Understanding these areas helps practices reduce denials and maintain accurate revenue cycle operations.

Understanding Pulmonology Office Visit Billing

Pulmonologists evaluate and manage a wide range of respiratory conditions, including:

• Asthma
• Chronic obstructive pulmonary disease (COPD)
• Pulmonary fibrosis
• Sleep apnea
• Interstitial lung disease
• Chronic cough
• Pulmonary hypertension
• Respiratory infections

These encounters are generally reported using Evaluation and Management (E/M) codes when appropriate.

Office/outpatient E/M services are selected based on:

• Medical Decision Making (MDM), or
• Total time on the date of service

The amount of documentation alone does not determine the E/M level.

A long clinical note does not automatically justify a higher-level code.

The selected E/M level should reflect the actual work performed.

Medical Decision Making in Pulmonology

MDM includes three major elements:

1. Problems addressed
2. Data reviewed and analyzed
3. Risk of patient management

Pulmonary care often involves significant activity in all three areas.

A pulmonologist may:

• Review CT scans
• Analyze pulmonary function tests
• Adjust inhaler therapy
• Evaluate worsening symptoms
• Manage oxygen therapy
• Coordinate care with other specialists

However, the documentation must demonstrate the work performed.

A diagnosis list alone does not determine coding complexity.

Problems Addressed

Pulmonary patients frequently have multiple chronic conditions.

Example:

A patient has:

• COPD
• Asthma
• Hypertension
• Diabetes
• Sleep apnea

If the visit focuses only on COPD management, the other diagnoses should not automatically increase the E/M level.

Documentation should identify:

• Conditions evaluated
• Clinical status
• Treatment decisions
• Follow-up plan

Only problems actually addressed should contribute to coding.

Data Review in Pulmonology

Pulmonology relies heavily on diagnostic information.

Examples include:

• Spirometry results
• Pulmonary function tests
• Chest X-rays
• CT scans
• Sleep studies
• Laboratory results
• Previous specialist reports

Reviewing data can contribute to MDM when the provider actually analyzes and uses the information in decision-making.

Simply having a test report available in the chart does not automatically support additional complexity.

Risk of Patient Management

Pulmonary medicine often involves significant management decisions.

Examples:

• Starting or changing inhaled medications
• Managing corticosteroid therapy
• Adjusting oxygen treatment
• Initiating advanced therapies
• Managing chronic respiratory failure

The decision-making process must be documented.

The presence of a medication alone does not automatically determine the E/M level.

Time-Based E/M Coding

Providers may also select applicable E/M levels based on total time.

Qualifying activities may include:

• Reviewing records
• Evaluating symptoms
• Counseling patients
• Ordering tests
• Managing treatment plans
• Documenting care
• Coordinating services

Time should be accurately documented when used for code selection.

Practices should avoid estimating time or including non-qualifying activities.

Spirometry Billing Basics

Spirometry is one of the most common pulmonary diagnostic procedures.

It measures airflow and helps evaluate conditions such as:

• Asthma
• COPD
• Restrictive lung disease
• Chronic respiratory symptoms

Spirometry coding depends on what service was performed.

The documentation should identify:

• Type of test performed
• Measurements obtained
• Interpretation requirements
• Provider involvement
• Clinical indication

CPT Coding for Spirometry

Common spirometry-related CPT coding includes:

CPT 94010

Spirometry, including graphic recording, total and timed vital capacity, expiratory flow rate measurement, with or without maximal voluntary ventilation.

This represents basic spirometry testing.

CPT 94060

Bronchodilator responsiveness testing.

This includes spirometry before and after administration of a bronchodilator.

The purpose is to evaluate changes in airflow after medication.

The correct code depends on the actual test performed.

Pulmonary Function Testing (PFT) Billing

Pulmonary function testing involves more than basic spirometry.

Additional testing may include:

• Lung volumes
• Diffusing capacity testing
• Complete pulmonary function studies

Coding depends on:

• Tests performed
• Measurements obtained
• Interpretation requirements

A common billing error is selecting a comprehensive PFT code when only spirometry was performed.

The documentation must support the reported service.

Documentation Requirements for Spirometry

A strong pulmonary testing record should include:

• Patient information
• Reason for testing
• Test performed
• Measurements/results
• Interpretation when applicable
• Provider authentication
• Date of service

Poor documentation creates billing risk.

For example:

"Breathing test completed."

This does not provide enough detail.

A stronger record explains:

• What test was performed
• Why it was performed
• What the findings showed
• How results affected care

Medical Necessity for Pulmonary Testing

Medicare and other payers require medical necessity for diagnostic testing.

The diagnosis should support why spirometry or PFT was needed.

Examples include:

• Shortness of breath
• Chronic cough
• Suspected asthma
• COPD evaluation
• Abnormal imaging
• Monitoring known pulmonary disease

The diagnosis should accurately reflect the clinical reason for the test.

Interpretation vs Technical Performance

Some diagnostic services involve separate professional and technical components.

The technical component may include:

• Equipment
• Staff
• Facility resources

The professional component may include:

• Interpretation
• Analysis
• Reporting

Pulmonary practices should determine whether they are billing:

• Global service
• Professional component
• Technical component

The correct billing approach depends on ownership, service performance, and payer rules.

Place of Service (POS) Rules in Pulmonology

Place of Service identifies where healthcare services are provided.

Pulmonology services may occur in:

• Physician offices
• Hospital outpatient departments
• Diagnostic facilities
• Sleep centers
• Inpatient hospitals

The POS must reflect the actual location.

POS 11 — Office

Commonly used when pulmonary services are provided in a physician office.

Examples:

• COPD follow-up
• Asthma management
• Office spirometry

Hospital-Based Settings

Pulmonary services performed in hospital environments may require different POS reporting.

Using the wrong POS can lead to:

• Claim delays
• Incorrect reimbursement
• Payer edits

Medicare Compliance in Pulmonology

Medicare billing requires accurate documentation and coding.

Key compliance areas include:

• Medical necessity
• Documentation
• Correct CPT selection
• Correct diagnosis coding
• Modifier usage
• Place of service accuracy
• Coverage requirements

Pulmonary practices should maintain a process for validating claims before submission.

Common Pulmonology Billing Errors

Error 1: Billing the Wrong PFT Code

A practice may report a comprehensive test when only spirometry occurred.

Solution:

Match the CPT code to the actual test performed.

Error 2: Weak Spirometry Documentation

A test without sufficient documentation may not support reimbursement.

Solution:

Document testing details, results, and interpretation requirements.

Error 3: Choosing E/M Levels Based on Diagnosis Severity

A severe disease does not automatically justify a high-level visit.

Solution:

Use documented MDM or qualifying time.

Error 4: Incorrect Place of Service

Reporting office POS for services performed elsewhere can create problems.

Solution:

Verify the actual service location.

Error 5: Ignoring Medical Necessity

A test requires a clinical reason.

Solution:

Ensure diagnosis codes support the service.

Error 6: Treating AI Suggestions as Final Codes

AI can assist coding but cannot replace compliance review.

Solution:

Use AI with human validation.

How AI Can Improve Pulmonology Billing

Modern billing systems can help pulmonology practices identify:

• Incorrect CPT selection
• Missing documentation
• Spirometry coding issues
• Medical necessity concerns
• Modifier problems
• POS inconsistencies
• Medicare rule conflicts

Examples:

"Pulmonary function test documented. Verify CPT matches performed components."

"Modifier usage requires documentation review."

"Diagnosis may not support medical necessity for selected test."

AI improves efficiency by identifying risks before claims are submitted.

However, final decisions require professional oversight.

Pulmonology Billing Checklist

Before submitting a claim:

☐ Verify patient information

☐ Confirm insurance coverage

☐ Select correct E/M level

☐ Validate CPT procedure codes

☐ Confirm spirometry/PFT documentation

☐ Verify diagnosis supports medical necessity

☐ Review modifiers

☐ Confirm place of service

☐ Check Medicare requirements

☐ Validate payer rules

☐ Run claim edits

Conclusion

Pulmonology billing requires accurate coordination between clinical documentation, diagnostic testing, coding rules, and Medicare compliance.

The foundation is simple:

E/M codes represent evaluation and management work.

CPT diagnostic codes represent pulmonary services performed.

ICD-10-CM supports medical necessity.

POS identifies where care occurred.

Documentation supports the entire claim.

The biggest billing problems occur when these elements are disconnected.

A strong pulmonary billing workflow validates every claim before submission.

With accurate spirometry coding, correct place-of-service reporting, strong documentation, and technology-assisted validation, pulmonology practices can reduce denials, improve reimbursement, and spend more time focused on respiratory patient care.