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CPT code 78630: CSF scan, cisternography2026 Medicare rate & RVUs in Idaho

A radionuclide cerebrospinal fluid scan tracks tracer movement through CSF spaces to assess circulation when a clinician needs functional imaging.

CMS RVU26DEffective Oct 1, 2026One payment locality796 Medicare services in 2024

In Idaho, Medicare pays $271.30 for 78630 in the office.

$271.30Office (non-facility)
Not available in this settingHospital or facility
−7.9%vs the national office rate ($294.60)

Check a contract rate as a % of Medicare · 78630 nationwide

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

We’ll open 78630 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Idaho
  2. What 78630 covers
  3. Compared with other areas
  4. Rate map
  5. How it’s calculated
  6. Payment rules
  7. Related codes
  8. Rate history
  9. Where it applies
  10. Billing questions
  11. Sources

What 78630 covers

This nuclear medicine study follows a radiotracer through cerebrospinal fluid spaces after intrathecal administration, with images obtained to evaluate CSF circulation and distribution. It is typically performed in a hospital nuclear medicine department or imaging center, with a nuclear medicine physician or radiologist interpreting the study. A clinician may request it when the diagnostic question concerns how CSF moves through the intracranial spaces rather than brain tissue appearance or shunt function alone.

Report 78630 for the CSF scan itself; the medical record should support the clinical question, the study performed, and the interpreting physician’s findings. CMS recognizes professional and technical components: report modifier 26 for the interpretation, TC for the equipment and staff, or neither modifier when billing the global service. The professional and technical services may be billed separately when performed by different entities. The scan’s findings should be distinguished from a targeted CSF leak study, ventricular study, or shunt evaluation when selecting among related nuclear medicine services.

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.

How Idaho compares for 78630

Across 109 of 109 payment localities, the office rate for 78630 runs from $255.02 in Arkansas to $414.46 in San Benito County, CA. Idaho pays $271.30. The RVUs are the same everywhere; the geographic indexes change the dollars.

78630 in Idaho vs other payment areas
  1. Idaho · this page$271.30
  2. Los Angeles, CA · California$343.64+$72.34
  3. Washington, DC area · District of Columbia$344.08+$72.78
  4. Miami, FL · Florida$310.74+$39.44
  5. Chicago, IL · Illinois$300.42+$29.12
  6. Manhattan, NY · New York$341.58+$70.28
  7. Alaska · Alaska$321.62+$50.32

Other areas in Idaho first, then benchmark localities. Bars start at $0.

Every other payment area

78630 in every other Medicare payment locality
Payment localityOfficeFacility
AlabamaAlabama$259.49—
ArkansasArkansas$255.02—
ArizonaArizona$285.77—
Bakersfield, CACalifornia$319.55—
Chico, CACalifornia$319.27—
El Centro, CACalifornia$319.28—
Fresno, CACalifornia$319.27—
Hanford, CACalifornia$319.27—

78630 rates by state

Office rate range in each state. Select a state to see its payment localities.

MEWIVTNHMTNDMNMINYMARIWAIDWYSDIAILINOHPANJCTORNVUTCONEMOKYWVVAMDDECAAZNMKSOKARTNNCSCDCTXLAMSALGAFLAKHI

Explore a state

Local rates. Clear comparisons.

Hover or focus a tile to see its rate range. Select it to open the state’s fee schedule.

$255.02

$366.87

Color shows the midpoint of each state’s locality range.

View every state and territory as a table
78630 office rate range by state
State / territoryOffice rate rangeLocalities
AK$321.621
AL$259.491
AR$255.021
AZ$285.771
CA$319.27–$414.4629
CO$311.361
CT$316.471
DC$344.081
DE$291.141
FL$284.43–$310.743
GA$266.16–$299.642
GU$330.071
HI$330.071
IA$269.701
ID$271.301
IL$273.06–$304.604
IN$273.231
KS$267.091
KY$264.431
LA$263.50–$279.172
MA$308.54–$347.362
MD$297.77–$344.083
ME$271.80–$290.942
MI$271.61–$287.462
MN$300.051
MO$257.36–$281.683
MS$256.301
MT$294.591
NC$275.351
ND$292.611
NE$271.791
NH$305.221
NJ$320.57–$339.292
NM$272.921
NV$294.311
NY$280.14–$349.755
OH$271.201
OK$265.051
OR$292.53–$323.982
PA$272.34–$306.682
PR$297.511
RI$303.541
SC$273.631
SD$292.381
TN$268.551
TX$270.13–$309.878
UT$278.101
VA$289.04–$344.082
VI$297.511
VT$290.251
WA$308.35–$356.202
WI$280.981
WV$260.771
WY$293.731

See 78630 in every payment locality

How the 78630 rate is calculated

Each of 78630’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 · 78630

RVUs × geographic indexes × conversion factor

Office or facility?

Work0.66

0.66 RVUs× 1.000 GPCI

Practice expense8.06

8.06 RVUs× 1.000 GPCI

Malpractice0.10

0.10 RVUs× 1.000 GPCI

Adjusted RVUs

8.8200

Conversion factor

$33.4009

Medicare rate

$294.60

Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.

The exact Idaho inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

9,464

Code
78630
Physician work
0.66
Practice expense
8.06
Malpractice
0.10

GPCI2026.csv

47

Locality
Idaho
Physician work
1.000
Practice expense
0.920
Malpractice
0.473
Office calculation for 78630 in Idaho
ComponentRVULocality factorAdjusted
Physician work0.66× 1.0000.6600
Practice expense8.06× 0.9207.4152
Malpractice0.10× 0.4730.0473
Total RVUs8.1225
Conversion factor× 33.4009

Office rate, Idaho$271.30

Office: (0.66 × 1 + 8.06 × 0.92 + 0.1 × 0.473) × $33.4009 = $271.30

Open 78630 in the RVU calculator

Payment rules and modifiers for 78630

The CMS indicators that decide how 78630 is paid alongside other services.

CMS payment indicators · 78630

CSF scan, cisternography

RuleCMS valueWhat it means
Global periodXXXThe global surgery concept doesn’t apply.
Multiple procedures0No multiple-procedure reduction.
Bilateral (modifier 50)0The 150% bilateral adjustment doesn’t apply.
Assistant at surgery (80/81/82/AS)0Not paid without supporting documentation.
Co-surgeons (62)0Not permitted.
Team surgery (66)0Not permitted.
Professional/technical1Diagnostic test with separate professional (26) and technical (TC) components.

What modifiers do to the payment

Modifier 26 · payment effect

With and without the modifier

78630 without 26 · national office

$294.60

CSF scan, cisternography

78630-26 · Professional component

$30.73

Pays only the interpretation and report.

When to use modifier 26

Codes related to 78630

Related codes aren’t interchangeable: bill the code that matches the service performed.

Codes related to 78630
CodeHow it relatesOffice range, Idaho
Used instead
78635CSF imaging, ventricular flow studyVentricular-focused CSF imaging when the diagnostic question concerns the ventricular system.$271.41
78645CSF shunt study, shunt patency assessmentEvaluates a CSF shunt rather than CSF circulation generally.$262.73
78650CSF leak imaging, leak detection and localizationUsed for imaging directed specifically at CSF leakage.$226.08

How 78630 has changed in Idaho

78630 · Office / nonfacility

$271.30

Effective 2026-10-01

The base rate is $4.92 higher than on 2025-10-01, moving from $266.38 to $271.30 (1.8%).

It is unchanged from the immediately preceding available release, effective 2026-07-01.

Base rate by release · bars start at $0 · select a bar to compare

One bar per available release, ordered by effective date. Missing rates remain gaps. These comparisons hold the code, setting and locality identifiers constant; they do not isolate which policy or input caused a change.

What changed, release by release

  1. January 1, 2026

    RVU26A

    $266.38changed to$271.30

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 0.68 changed to 0.66
    • Practice expense RVU 8.28 changed to 8.06
    • Malpractice RVU 0.08 changed to 0.10
    • Practice expense GPCI 0.908 changed to 0.920
    • Malpractice GPCI 0.461 changed to 0.473

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $279.72changed to$266.38

    • Conversion factor 33.2875 changed to 32.3465
    • Practice expense RVU 8.46 changed to 8.28
    • Malpractice RVU 0.09 changed to 0.08

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $275.16changed to$279.72

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $285.69changed to$275.16

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 8.64 changed to 8.46
    • Malpractice RVU 0.08 changed to 0.09
    • Practice expense GPCI 0.893 changed to 0.908
    • Malpractice GPCI 0.439 changed to 0.461

  5. January 1, 2023

    RVU23A

    $291.90changed to$285.69

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 8.80 changed to 8.64
    • Malpractice RVU 0.09 changed to 0.08
    • Practice expense GPCI 0.877 changed to 0.893
    • Malpractice GPCI 0.416 changed to 0.439

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $305.34changed to$291.90

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 9.16 changed to 8.80

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $311.75changed to$305.34

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 8.90 changed to 9.16
    • Malpractice RVU 0.08 changed to 0.09
    • Practice expense GPCI 0.890 changed to 0.877
    • Malpractice GPCI 0.464 changed to 0.416

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $317.90changed to$311.75

    • Conversion factor 36.0391 changed to 36.0896
    • Practice expense RVU 8.98 changed to 8.90
    • Practice expense GPCI 0.902 changed to 0.890
    • Malpractice GPCI 0.512 changed to 0.464

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $323.72changed to$317.90

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 9.17 changed to 8.98

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $321.41changed to$323.72

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 9.15 changed to 9.17
    • Practice expense GPCI 0.900 changed to 0.902
    • Malpractice GPCI 0.510 changed to 0.512

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $318.71changed to$321.41

    • Conversion factor 35.8043 changed to 35.8887
    • Practice expense RVU 9.11 changed to 9.15
    • Practice expense GPCI 0.898 changed to 0.900
    • Malpractice GPCI 0.508 changed to 0.510

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $319.54changed to$318.71

    • Conversion factor 35.9335 changed to 35.8043
    • Practice expense RVU 9.10 changed to 9.11

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $317.95changed to$319.54

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $310.90changed to$317.95

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 8.89 changed to 9.10
    • Malpractice RVU 0.06 changed to 0.08
    • Practice expense GPCI 0.896 changed to 0.898
    • Malpractice GPCI 0.556 changed to 0.508

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $320.02changed to$310.90

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 9.72 changed to 8.89
    • Practice expense GPCI 0.894 changed to 0.896
    • Malpractice GPCI 0.603 changed to 0.556

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: $320.02

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$271.30Not available in this settingRVU26D
2026-07-01$271.30Not available in this settingRVU26C
2026-04-01$271.30Not available in this settingRVU26B
2026-01-01$271.30Not available in this settingRVU26A
2025-10-01$266.38Not available in this settingRVU25D
2025-07-01$266.38Not available in this settingRVU25C
2025-04-01$266.38Not available in this settingRVU25B
2025-01-01$266.38Not available in this settingRVU25A
2024-10-01$279.72Not available in this settingRVU24D
2024-07-01$279.72Not available in this settingRVU24C
2024-04-01$279.72Not available in this settingRVU24B
2024-03-09$279.72Not available in this settingRVU24AR
2024-01-01$275.16Not available in this settingRVU24A
2023-10-01$285.69Not available in this settingRVU23D
2023-07-01$285.69Not available in this settingRVU23C
2023-04-01$285.69Not available in this settingRVU23B
2023-01-01$285.69Not available in this settingRVU23A
2022-10-01$291.90Not available in this settingRVU22D
2022-07-01$291.90Not available in this settingRVU22C
2022-04-01$291.90Not available in this settingRVU22B
2022-01-01$291.90Not available in this settingRVU22A
2021-10-01$305.34Not available in this settingRVU21D
2021-07-01$305.34Not available in this settingRVU21C
2021-04-01$305.34Not available in this settingRVU21B
2021-01-01$305.34Not available in this settingRVU21A
2020-10-01$311.75Not available in this settingRVU20D
2020-07-01$311.75Not available in this settingRVU20C
2020-04-01$311.75Not available in this settingRVU20B
2020-01-01$311.75Not available in this settingRVU20A
2019-10-01$317.90Not available in this settingRVU19D
2019-07-01$317.90Not available in this settingRVU19C
2019-04-01$317.90Not available in this settingRVU19B
2019-01-01$317.90Not available in this settingRVU19A
2018-10-01$323.72Not available in this settingRVU18D
2018-07-01$323.72Not available in this settingRVU18C
2018-04-01$323.72Not available in this settingRVU18B
2018-01-01$323.72Not available in this settingRVU18AR1
2017-10-01$321.41Not available in this settingRVU17D
2017-07-01$321.41Not available in this settingRVU17C
2017-04-01$321.41Not available in this settingRVU17B
2017-01-01$321.41Not available in this settingRVU17A
2016-10-01$318.71Not available in this settingRVU16D
2016-07-01$318.71Not available in this settingRVU16C
2016-04-01$318.71Not available in this settingRVU16B
2016-01-01$318.71Not available in this settingRVU16A
2015-10-01$319.54Not available in this settingRVU15D
2015-07-01$319.54Not available in this settingRVU15C
2015-04-01$317.95Not available in this settingRVU15B
2015-01-01$317.95Not available in this settingRVU15A
2014-10-01$310.90Not available in this settingRVU14D
2014-07-01$310.90Not available in this settingRVU14C
2014-04-01$310.90Not available in this settingRVU14B
2014-01-01$310.90Not available in this settingRVU14A
2013-10-01$320.02Not available in this settingRVU13D
2013-07-01$320.02Not available in this settingRVU13C
2013-04-01$320.02Not available in this settingRVU13B
2013-01-01$320.02Not available in this settingRVU13AR

Price 78630 for an earlier date of service

Where the Idaho rate applies

Idaho is a Medicare payment area, not a city. Our Census mapping connects it to 235 cities and communities in Idaho. Some span more than one payment area; confirm with the service ZIP.

  • Aberdeen
  • Acequia
  • Albion
  • American Falls
  • Ammon
  • Arbon Valley
  • Arco
  • Arimo

Browse all communities in Idaho

78630 billing questions

How does 78630 differ from a CSF leak study?

78630 describes a CSF scan assessing tracer movement through CSF spaces. Use 78650 when the imaging service is specifically a CSF leakage study.

When should 78635 be considered instead?

78635 is for CSF ventriculography, a ventricular-focused study. Choose based on the study actually performed and its diagnostic target, not just the fact that both involve CSF.

Can the professional and technical services be billed separately?

Yes. Modifier 26 identifies the professional interpretation, and TC identifies the technical service; billing without either modifier represents the global service.

What documentation supports 78630?

The record should identify the clinical question about CSF circulation, the scan performed, and the interpreting physician’s findings.

Is 78630 the code for evaluating a CSF shunt?

No. 78645 describes CSF shunt evaluation; 78630 reports a scan focused on CSF circulation and distribution.

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
RVUs for 78630PPRRVU2026_Oct_nonQPP.csv, line 9,464 (RVU26D)
Geographic factors for IdahoGPCI2026.csv, line 47 (RVU26D)

Open CMS sourceHow we calculate rates

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