CPT code 93985: Dialysis access mapping2026 Medicare rate & RVUs in Guam
Bilateral duplex mapping evaluates arterial inflow and venous pathways to help plan hemodialysis access creation in a patient needing vascular access.
Medicare pays $276.57 for 93985 in the office in Guam (Hawaii, Guam). 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.
On this page 9 sections
What 93985 covers
This duplex ultrasound maps vessels relevant to hemodialysis access on both sides, assessing arterial inflow and the veins and access-related anatomy needed for planning. A vascular sonographer typically acquires the images in a vascular laboratory or imaging department; a qualified physician, such as a radiologist or vascular specialist, interprets the study. It is commonly performed before choosing a site for a dialysis fistula or graft.
Report 93985 for a complete bilateral mapping examination, supported by documentation of the clinical need and the vessels and sides examined. The code is already priced as bilateral, so modifier 50 does not increase payment. The global service is billed without a component modifier; modifier 26 identifies the interpretation, and modifier TC identifies the technical service. 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.
93985 in Hawaii, Guam
| Payment locality | Office | Facility |
|---|---|---|
| Hawaii, Guam | $276.57 | Unavailable |
How the 93985 rate is calculated
Each of 93985’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 · 93985
RVUs × geographic indexes × conversion factor
Work0.78
0.78 RVUs× 1.000 GPCI
Practice expense6.51
6.51 RVUs× 1.000 GPCI
Malpractice0.17
0.17 RVUs× 1.000 GPCI
Adjusted RVUs
7.4600
Conversion factor
$33.4009
Medicare rate
$249.17
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 93985
The CMS indicators that decide how 93985 is paid alongside other services.
CMS payment indicators · 93985
Dialysis access mapping
| 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) | 2 | Already bilateral by definition: paid once at 100%. |
| 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
93985 without 26 · national office
$249.17
Dialysis access mapping
93985-26 · Professional component
$37.07
Pays only the interpretation and report.
93985 compared with similar codes
Compare codes · National
5 codes, side by side
How to choose
- 93986Dup-scan hemo compl uni std
- 93985 is the complete bilateral mapping study; 93986 is the complete unilateral study.
- 93990Doppler flow testing
- Use 93985 for vessel mapping to plan hemodialysis access. Code 93990 is for evaluation of an existing access.
- 93930Arm arterial duplex
- 93930 is a bilateral upper-extremity arterial duplex. Choose 93985 when the service is complete hemodialysis-access mapping that includes arterial inflow and venous pathways.
- 93970Venous duplex scan
- 93970 is a bilateral extremity venous duplex. Choose 93985 for the complete hemodialysis-access mapping examination, not an isolated venous study.
93985 billing questions
When should 93985 be selected instead of 93986?
Use 93985 for a complete bilateral hemodialysis-access mapping study. Use 93986 when the complete study is unilateral.
Does 93985 include both arms?
Yes. The code is priced as bilateral, and modifier 50 does not increase payment.
Can the professional and technical services be billed separately?
Yes. Modifier 26 identifies the physician interpretation, and modifier TC identifies the equipment and staff service. Without either modifier, the claim represents the global service.
Does the multiple procedure reduction affect the entire service?
For multiple cardiovascular diagnostic procedures, the reduction applies to the technical component of 93985.
How is 93985 different from 93990?
93985 maps vessels for hemodialysis access planning. Code 93990 evaluates an existing hemodialysis access rather than providing the complete bilateral planning study.
What documentation supports reporting 93985?
Document the access-planning indication, bilateral examination, and the vessels assessed. The record should support that the study was a complete mapping examination.
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.
CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027
Show the CMS file lines behind this rate
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