CPT code 00104: ECT anesthesia2026 Medicare rate & RVUs in Massachusetts
Reports anesthesia furnished for an electroconvulsive therapy session, distinct from the psychiatrist's ECT service and tied to the treatment encounter.
CMS doesn’t publish an office rate for 00104 in Massachusetts.
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 00104 covers
Anesthesia for electroconvulsive therapy (ECT) supports the psychiatrist’s electrical treatment. An anesthesiologist or CRNA typically provides a brief general anesthetic and medication to limit muscle movement while the psychiatrist administers ECT, in an ECT treatment setting. The anesthesia claim represents the anesthesia practitioner’s service, separate from the psychiatrist’s ECT service.
Report 00104 for anesthesia furnished for ECT; 90870 represents the ECT treatment itself. The anesthesia and ECT records should identify the treatment session and link the anesthesia to it, while the anesthesia record supports the timing and the point at which the patient can safely be placed under postoperative care. This code has 4 base units, and Medicare payment is (base units + time units) multiplied by the locality-specific anesthesia conversion factor. Time is reported in minutes and converted to 15-minute units to one decimal place, beginning when the practitioner starts preparing the patient for anesthesia and ending when the practitioner is no longer in personal attendance and the patient can safely be placed under postoperative care.
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 00104 pays more and less in Massachusetts
| Payment locality | Office | Facility |
|---|---|---|
| Metropolitan Boston, MA | Unavailable | Unavailable |
| Rest of Massachusetts | Unavailable | Unavailable |
How the 00104 rate is calculated
Each of 00104’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 · 00104
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 00104
00104 has no global surgery period, no multiple-procedure, bilateral or assistant-at-surgery adjustment, and no professional/technical split. What changes the payment is where the service happens: the place of service on the claim decides whether Medicare pays the office or the facility rate.
Place of service · 00104
Which rate does Medicare pay?
The POS code on the claim line (CMS-1500 box 24B).
POS 11 · non-facility rate · national
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00104 isn’t priced in this setting.
00104 compared with similar codes
Compare codes · National
00104 vs 90870 vs 01999: Medicare rates
How to choose
- 90870Electroconvulsive therapy
- 90870 represents the ECT treatment performed by the psychiatrist. Use 00104 for the anesthesia practitioner’s service supporting that treatment.
- 01999Unlisted anesthesiaNo listed procedure-specific code
- 01999 is for anesthesia services without a specific listed anesthesia code. ECT has the specific anesthesia code 00104.
00104 billing questions
How is 00104 different from 90870?
00104 represents the anesthesia service for an ECT session. Code 90870 represents the ECT treatment itself.
Does 00104 include the psychiatrist’s ECT service?
No. The anesthesia practitioner reports 00104, while the psychiatrist’s ECT service is represented separately by 90870.
How does Medicare calculate units for 00104?
The code has 4 base units. Medicare adds time units, calculated from anesthesia minutes in 15-minute units to one decimal place.
What should the records show?
The ECT and anesthesia records should identify the treatment session and link the anesthesia to it. The anesthesia record should support the time from preparation through the point when the practitioner is no longer in personal attendance and the patient can safely be placed under postoperative care.
When would an unlisted anesthesia code be considered instead?
Code 01999 is for anesthesia services without a specific listed anesthesia code that describes the procedure. ECT has the specific anesthesia code 00104.
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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