CPT 76770Radiology

Us exam abdo back wall comp

CPT code 76770 covers a complete ultrasound examination of the back wall of the abdomen (retroperitoneum), which includes looking at organs like the kidneys, aorta, and surrounding structures. This is a non-invasive imaging test that uses sound waves to create pictures of organs deep in the abdomen.

Showing rates for

National Average

Base Medicare rate

$104.48

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

0.74

PE RVU (NF)

2.43

MP RVU

0.06

Total RVU

3.23

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

NCCI bundling edits

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Billing tips

Always document visualization of all required retroperitoneal structures (both kidneys, aorta, IVC, iliac origins) to support complete exam billing
Impact: Prevents downcoding from 76770 ($104.48) to 76775 limited study (approximately 25-30% lower reimbursement)
Capture and archive permanent images of each required anatomic area per AIUM guidelines; incomplete image documentation is a top audit trigger
Impact: Reduces audit risk and recoupment; Medicare recovery audits for ultrasound studies average $800-$2,000 per case when documentation fails
Do not bill 76770 with 76856 (pelvic ultrasound) on same date without modifier 59 and clear documentation of separate medical necessity
Impact: Prevents automatic bundling denial; approximately 40% of combination claims denied without proper modifier use
Bill globally (no modifier) in office settings where you own equipment and provide interpretation; split 26/TC in facility settings
Impact: Ensures maximum appropriate reimbursement; incorrect modifier use can reduce payment by 50% or trigger overpayment recovery
Document measurements of aorta in centimeters and any abnormal kidney dimensions; quantitative data strengthens medical necessity
Impact: Reduces denial rate by 15-20% and supports repeat studies when measurements show disease progression
When kidneys cannot be visualized due to bowel gas or body habitus, document attempts and rationale for incomplete exam; consider billing 76775 instead
Impact: Prevents fraud allegations; billing 76770 without complete visualization can trigger OIG scrutiny and payment recovery

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 76770 in 2025?

The 2025 Medicare national average payment for CPT 76770 is $104.48 for both facility and non-facility settings. This rate is based on 3.23 total RVUs multiplied by the 2025 conversion factor of $32.3465.

What is the difference between CPT 76770 and 76775?

CPT 76770 is a complete retroperitoneal ultrasound examining all standard structures (both kidneys, aorta, IVC, iliac origins), while 76775 is a limited study focusing on specific organs or areas. Complete studies require documentation of all anatomic areas; limited studies examine only clinically indicated structures.

Can CPT 76770 be billed with modifier 26 or TC?

Yes, 76770 can be split into professional (modifier 26) and technical (modifier TC) components. Use modifier 26 when billing only the interpretation, TC when billing only the technical service with equipment and staff. In office settings where you provide both components, bill globally without modifiers.

How many RVUs is CPT code 76770 worth?

CPT 76770 has 3.23 total RVUs in 2025, consisting of 0.74 work RVUs, 2.43 practice expense RVUs (both facility and non-facility), and 0.06 malpractice RVUs according to the CMS Physician Fee Schedule.

What diagnosis codes support medical necessity for CPT 76770?

Common supporting diagnoses include abdominal or flank pain, hematuria, suspected kidney stones, AAA screening, hypertension evaluation, renal mass follow-up, retroperitoneal lymphadenopathy, and chronic kidney disease monitoring. The diagnosis must justify examining the specific retroperitoneal structures included in the study.

Can 76770 and 76856 be billed together on the same date?

Yes, but these codes may bundle depending on payer policy. Use modifier 59 on 76770 when billing with 76856 (pelvic ultrasound) to indicate distinct services, and ensure documentation clearly shows separate clinical indications for retroperitoneal and pelvic examinations.

What images must be saved to support billing CPT 76770?

You must archive permanent images of both kidneys (longitudinal and transverse views), the abdominal aorta (proximal, mid, and distal segments), IVC, and iliac artery origins. AIUM standards recommend minimum image sets for each anatomic area. Incomplete image documentation is a primary reason for claim denials and audit failures.