CPT 78266Radiology

Gastric emptying imag study

CPT code 78266 represents a gastric emptying imaging study, a nuclear medicine test that tracks how quickly food moves through your stomach by using a small amount of radioactive material mixed with a meal.

Showing rates for

National Average

Base Medicare rate

$384.92

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

1.08

PE RVU (NF)

10.72

MP RVU

0.1

Total RVU

11.9

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Ensure strict adherence to the standardized low-fat, egg-white meal protocol (120 kcal, <2% fat) as specified by consensus guidelines; non-standard meals are a primary denial reason
Impact: Non-compliance can result in 100% claim denial ($384.92 loss) and potential audit flags
Document all four imaging time points (0, 1, 2, and 4 hours) in the medical record; incomplete protocols may require modifier 52 and reduced payment
Impact: Missing time points can reduce reimbursement by 25-50% ($96-$192 reduction)
Bill globally (without modifiers) when your facility performs both technical and professional components; split billing with 26/TC modifiers only when components are truly separate
Impact: Incorrect modifier use can delay payment 15-30 days and trigger claims reviews
Verify pre-authorization requirements with commercial payers before scheduling; many require prior auth for nuclear medicine studies
Impact: Lack of prior authorization results in automatic denial of $384.92 and difficult appeals
Document patient preparation compliance (8-hour fast, medication holds per protocol) and any deviations that might affect results
Impact: Poor preparation documentation increases audit risk and can support medical necessity denials
Report exact gastric retention percentages at each time point in the interpretation report; quantitative data strengthens medical necessity and appeal success
Impact: Quantitative reporting reduces denial rate by approximately 15-20% and supports medical necessity on review

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 78266 in 2025?

The 2025 Medicare national average reimbursement for CPT 78266 is $384.92 for both facility and non-facility settings, based on 11.9 total RVUs and a conversion factor of 32.3465.

How long does a gastric emptying study take for billing purposes?

A complete gastric emptying study under CPT 78266 requires imaging over 4 hours with images typically acquired at 0, 1, 2, and 4 hours post-meal ingestion. Incomplete protocols may require modifier 52 and result in reduced payment.

Can I bill 78266 with modifier 26 for just reading the study?

Yes, modifier 26 should be appended when billing only the professional component (physician interpretation). The technical component would be billed separately with modifier TC by the facility providing equipment and staff.

What diagnosis codes support medical necessity for CPT 78266?

Common supporting diagnoses include K31.84 (gastroparesis), E11.43 (diabetes with diabetic gastroparesis), R11.2 (nausea with vomiting), K91.1 (postgastric surgery syndromes), and R10.13 (epigastric pain). Documentation must support chronic symptoms requiring motility assessment.

Do commercial insurers require prior authorization for gastric emptying studies?

Most major commercial payers require prior authorization for CPT 78266 due to the nuclear medicine component and cost. Performing the study without obtaining required authorization typically results in automatic denial of the $384.92 claim.

What is the difference between CPT 78264 and 78266?

CPT 78264 is for gastric emptying imaging study without quantification, while 78266 is the more commonly used code that includes quantitative analysis with specific retention percentages at timed intervals. Most clinical scenarios require the quantitative study (78266).

How often can gastric emptying studies be repeated and billed to Medicare?

Medicare does not have a specific frequency limitation for CPT 78266, but medical necessity must be documented for repeat studies. Generally, intervals of 3-6 months are acceptable when there is a clinical change, treatment modification, or significant symptom alteration requiring reassessment.