CPT code 93978: Vascular duplex, complete central vessel study2026 Medicare rate & RVUs in Michigan
Reports a complete duplex evaluation of the aorta, vena cava, iliac vessels, or a related bypass graft for vascular disease assessment.
Medicare pays $167.95–$178.34 for 93978 in the office in Michigan, from Rest of Michigan to Detroit, MI. Which amount applies depends on the service address.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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On this page 9 sections
What 93978 covers
This service uses duplex ultrasound to assess blood flow and vessel structure in the aorta, inferior vena cava, iliac vessels, or a related bypass graft. Vascular sonographers commonly acquire the images in an outpatient vascular laboratory or hospital department; a qualified physician interprets the study. Clinical uses include assessment of suspected aortoiliac disease, surveillance of an aneurysm, evaluation of a graft, or investigation of suspected caval obstruction or thrombosis.
Select this code when the documented examination is complete for the relevant vessel or graft; use 93979 when the examination is limited. The report should identify the anatomy examined and include findings supporting the complete evaluation. The service may be billed globally, or split into interpretation with modifier 26 and equipment-and-staff services with modifier TC. When multiple cardiovascular diagnostic procedures are performed, the multiple procedure reduction applies to the technical component.
This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.
Where 93978 pays more and less in Michigan
| Payment locality | Office | Facility |
|---|---|---|
| Detroit, MI | $178.34 | Unavailable |
| Rest of Michigan | $167.95 | Unavailable |
How the 93978 rate is calculated
Each of 93978’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.
How the rate is built · 93978
RVUs × geographic indexes × conversion factor
Work0.78
0.78 RVUs× 1.000 GPCI
Practice expense4.48
4.48 RVUs× 1.000 GPCI
Malpractice0.14
0.14 RVUs× 1.000 GPCI
Adjusted RVUs
5.4000
Conversion factor
$33.4009
Medicare rate
$180.36
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 93978
The CMS indicators that decide how 93978 is paid alongside other services.
CMS payment indicators · 93978
Vascular duplex, complete central vessel study
| Rule | CMS value | What it means |
|---|---|---|
| Global period | XXX | The global surgery concept doesn’t apply. |
| Multiple procedures | 6 | Diagnostic cardiovascular reduction applies to the technical component. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 1 | Diagnostic test with separate professional (26) and technical (TC) components. |
What modifiers do to the payment
Modifier 26 · payment effect
With and without the modifier
93978 without 26 · national office
$180.36
Vascular duplex, complete central vessel study
93978-26 · Professional component
$37.41
Pays only the interpretation and report.
93978 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 93979Vascular duplexLimited abdominal study
- This code represents a complete evaluation of the relevant central vessel or graft anatomy; 93979 is for a limited examination.
- 93975Vascular duplexComplete organ inflow and outflow
- 93975 evaluates abdominal or pelvic visceral vascular flow. Choose this code when the study instead examines the aorta, vena cava, iliac vessels, or related graft.
- 93976Vascular duplexLimited abdominal, pelvic, or scrotal study
- 93976 is the limited visceral vascular duplex option. It does not replace a complete central vessel or graft evaluation.
93978 billing questions
How does this differ from 93979?
93978 represents a complete evaluation of the relevant aortic, caval, iliac, or graft anatomy. Use 93979 for a limited examination.
Can the professional and technical services be billed separately?
Yes. Report modifier 26 for the professional interpretation or TC for the technical service; billing without either modifier represents the global service.
What documentation supports the complete-study code?
Document the clinical indication, the vessel or graft examined, and findings that support a complete evaluation of that anatomy.
What happens when another cardiovascular diagnostic test is performed?
The multiple procedure reduction applies to the technical component. It does not change the professional component.
Is this the code for a visceral artery duplex?
No. This code addresses the aorta, inferior vena cava, iliac vessels, or a related bypass graft; 93975 and 93976 address a different abdominal or pelvic vascular study.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.
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