CPT® Code 91065 is used to report a breath hydrogen or methane test performed to evaluate gastrointestinal conditions associated with abnormal carbohydrate fermentation and intestinal bacterial activity. The test measures gases in a patient's exhaled breath after administration of a test substance and can help evaluate conditions such as carbohydrate malabsorption and small intestinal bacterial overgrowth (SIBO).
During the test, the patient typically consumes a specified substrate, followed by collection of breath samples at timed intervals. The samples are analyzed for hydrogen and/or methane levels, with the results interpreted in the context of the patient's symptoms and clinical history.
This code represents the breath testing service, while the test substrate or other separately reportable services may be handled according to applicable coding and payer requirements.
Key Facts About CPT® 91065
- Service type: Gastrointestinal diagnostic breath test
- Test: Breath hydrogen or methane analysis
- Specimen type: Exhaled breath
- Test purpose: Evaluate carbohydrate malabsorption and intestinal fermentation patterns
- Provider type: Physicians, gastroenterology practices, laboratories, and qualified healthcare professionals
Common clinical indications:
- Suspected small intestinal bacterial overgrowth (SIBO)
- Carbohydrate malabsorption
- Lactose intolerance
- Fructose malabsorption
- Gastrointestinal symptoms associated with abnormal intestinal fermentation
When to Use CPT® 91065
CPT 91065 is appropriate when:
- A provider performs a breath hydrogen or methane test
- Breath samples are collected following administration of an appropriate test substrate
- Testing is ordered to evaluate suspected gastrointestinal malabsorption or bacterial overgrowth
- The testing is medically necessary based on the patient's symptoms and clinical presentation
Examples:
- Evaluating a patient with persistent bloating, abdominal discomfort, and excessive gas
- Testing for suspected lactose malabsorption
- Evaluating possible fructose malabsorption
- Assessing a patient for suspected SIBO using hydrogen and/or methane breath measurements
Documentation Requirements
To support CPT 91065 billing, documentation should include:
- Patient identifiers and date of service
- Clinical indication for breath testing
- Relevant gastrointestinal symptoms and medical history
- Test substrate administered, when applicable
- Breath collection protocol and timed samples
- Hydrogen and/or methane measurements
- Test findings and interpretation
- Ordering provider information
Complete documentation supports medical necessity, accurate billing, and continuity of gastrointestinal care.
Reimbursement and Coding Considerations
- CPT 91065 is used for breath hydrogen or methane testing
- Diagnosis coding should support the clinical reason for testing, such as suspected malabsorption or SIBO
- Documentation should identify the testing protocol and relevant breath measurements
- Coverage may vary depending on the patient's diagnosis, payer policy, and testing indication
- Any separately reportable supplies, substrates, or services should be coded according to applicable payer and CPT guidelines
Always verify payer-specific gastrointestinal testing and laboratory billing requirements before submitting claims.
How OptiMantra Supports Gastrointestinal Testing
OptiMantra's integrated EMR and practice management platform streamlines documentation and billing for CPT 91065:
With OptiMantra, providers can:
- Document gastrointestinal breath testing within the patient chart
- Record symptoms, testing indications, and relevant clinical history
- Track hydrogen and methane test results over time
- Link test findings to diagnoses, treatment plans, and follow-up recommendations
- Maintain organized diagnostic testing documentation that supports billing compliance and audit preparedness
- Keep gastrointestinal testing and related clinical information within the patient's longitudinal record
By centralizing diagnostic testing workflows, OptiMantra helps practices improve efficiency, support compliant documentation, and maintain comprehensive records for gastrointestinal care.
Try OptiMantra for free here!
Disclaimer: CPT® codes are maintained by the American Medical Association. This guide is for informational purposes only and does not replace official coding guidelines or payer policies.
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