CPT code 95955: Intraoperative EEG, during surgery2026 Medicare rate & RVUs in Guam
Reports EEG recording and interpretation during surgery, commonly to assess cerebral electrical activity during procedures such as carotid endarterectomy.
Medicare pays $219.41 for 95955 in the office in Guam (Hawaii, Guam, HI). 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 95955 covers
This service records and interprets cerebral electrical activity during an operation. A classic setting is carotid endarterectomy, where EEG changes can help identify possible cerebral ischemia during carotid clamping. Scalp electrodes capture the tracing while the patient is under anesthesia; a neurologist or other qualified physician interprets the recording, with technical staff supporting electrode placement and recording in the operating room.
Report 95955 for the intraoperative EEG service, not for motor or sensory evoked-potential monitoring alone. The operative and EEG documentation should identify the procedure, monitoring period, recording and interpretation, and clinically relevant findings. CMS recognizes separately priced professional and technical components: use modifier 26 for interpretation, modifier TC for equipment and staff, or neither modifier when billing the global service. CMS lists no add-on status, global period, or multiple-procedure reduction for this code.
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.
95955 in Hawaii, Guam, HI
| Payment locality | Office | Facility |
|---|---|---|
| Hawaii, Guam, HI | $219.41 | Unavailable |
How the 95955 rate is calculated
Each of 95955’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 · 95955
RVUs × geographic indexes × conversion factor
Work0.98
0.98 RVUs× 1.000 GPCI
Practice expense4.89
4.89 RVUs× 1.000 GPCI
Malpractice0.05
0.05 RVUs× 1.000 GPCI
Adjusted RVUs
5.9200
Conversion factor
$33.4009
Medicare rate
$197.73
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 95955
The CMS indicators that decide how 95955 is paid alongside other services.
CMS payment indicators · 95955
Intraoperative EEG, during surgery
| Rule | CMS value | What it means |
|---|---|---|
| Global period | XXX | The global surgery concept doesn’t apply. |
| 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
95955 without 26 · national office
$197.73
Intraoperative EEG, during surgery
95955-26 · Professional component
$53.11
Pays only the interpretation and report.
95955 compared with similar codes
Compare codes · National
5 codes, side by side
How to choose
- 95954EEG activationMedication-provoked
- 95955 is for EEG during surgery. 95954 describes EEG monitoring associated with drug administration, not intraoperative monitoring simply because drugs are used during anesthesia.
- 95957EEG analysisDigital analysis
- 95955 covers intraoperative EEG. 95957 represents digital analysis of EEG data, a distinct service rather than the surgical EEG service itself.
- 95940Intraoperative monitoringOne-on-one, in operating room
- 95955 identifies the intraoperative EEG diagnostic test. 95940 describes intraoperative neurophysiology monitoring time in the operating room; it is not an EEG test code.
- 95941Remote IONMHourly or multiple-patient
- 95955 is the intraoperative EEG service. 95941 concerns remote or multiple-patient intraoperative neurophysiology monitoring time, not the EEG recording itself.
95955 billing questions
When is 95955 appropriate instead of an evoked-potential code?
Use 95955 when the monitored signal is the brain's spontaneous electrical activity recorded by EEG during surgery. Motor- or sensory-evoked responses are distinct tests and should be matched to the applicable evoked-potential code.
What do modifiers 26 and TC represent?
Modifier 26 identifies the professional interpretation; modifier TC identifies the technical service, including equipment and staff. Without either modifier, the claim represents the global service.
What documentation supports reporting 95955?
Document the operation and monitoring period, the EEG recording, the interpreting clinician, and the interpretation or relevant changes in the tracing.
Can 95955 be reported for EEG monitoring with drug administration?
95955 describes EEG during surgery. EEG monitoring associated with administration of drugs is a different service; select a code that reflects that service rather than using 95955 solely because EEG was recorded.
Does the code describe EEG digital analysis?
No. 95955 is for EEG during surgery. Digital analysis is a separate EEG service and should not be substituted for intraoperative EEG monitoring.
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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