CPT code 93621: Left atrial pacing, EP study add-on2026 Medicare rate & RVUs in Maine
Reports left atrial pacing and recording as an add-on during a comprehensive invasive electrophysiology study.
CMS doesn’t publish an office rate for 93621 in Maine.
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 93621 covers
This add-on covers pacing and electrical recording from the left atrium during a comprehensive invasive electrophysiology study. A cardiac electrophysiologist or other qualified physician performs the study in an electrophysiology laboratory, using intracardiac catheters to evaluate electrical activity in a patient being assessed for an arrhythmia. The service supplements the primary study and is not a stand-alone study code.
For Medicare, this CPT code has carrier-priced status: CMS publishes no national payment, and the Medicare Administrative Contractor sets payment for each claim. It is an add-on reported with a primary procedure and paid within that procedure's global period. The diagnostic service has professional and technical components: modifier 26 identifies the interpretation, modifier TC identifies the equipment and staff, and no modifier represents the global service.
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 93621 pays more and less in Maine
| Payment locality | Office | Facility |
|---|---|---|
| Rest of Maine | Unavailable | Unavailable |
| Southern Maine, ME | Unavailable | Unavailable |
How the 93621 rate is calculated
Each of 93621’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 · 93621
RVUs × geographic indexes × conversion factor
Work0.00
0.00 RVUs× 1.000 GPCI
Practice expense0.00
0.00 RVUs× 1.000 GPCI
Malpractice0.00
0.00 RVUs× 1.000 GPCI
Adjusted RVUs
0.0000
Conversion factor
$33.4009
Medicare rate
$0.00
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 93621
The CMS indicators that decide how 93621 is paid alongside other services.
CMS payment indicators · 93621
Left atrial pacing, EP study add-on
| Rule | CMS value | What it means |
|---|---|---|
| Global period | ZZZ | Add-on code: falls within the primary procedure’s global period. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| 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
93621 without 26 · national facility
$0.00
Left atrial pacing, EP study add-on
93621-26 · Professional component
$79.49
Pays only the interpretation and report.
93621 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 93620EP evaluationRight-sided pacing
- 93620 is the primary comprehensive EP evaluation. Add 93621 when left atrial pacing and recording are also performed.
- 93622LV pacingComprehensive EP study
- 93622 concerns left ventricular pacing and recording; this code concerns the left atrium.
- 93623Drug-provoked stimulationAfter IV infusion
- 93623 describes pharmacologic stimulation during an EP study, not left atrial pacing and recording.
93621 billing questions
Can this code be reported by itself?
No. It is an add-on and must be reported with a primary procedure, such as the comprehensive EP study represented by 93620.
How does this differ from 93620?
93620 represents the primary comprehensive EP evaluation. Report 93621 in addition when left atrial pacing and recording are performed as part of that study.
When would 93622 be reported instead?
93622 describes left ventricular pacing and recording. This code describes left atrial pacing and recording; select according to the chamber studied.
Which modifiers identify the components?
Modifier 26 identifies the professional interpretation, and modifier TC identifies the technical service. Without either modifier, the code represents the global service.
How does Medicare set payment for this code?
CMS assigns carrier-priced status, so it publishes no national payment; the Medicare Administrative Contractor sets payment for each claim.
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
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