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CPT code 77370: Radiation physics consult, unusual treatment circumstances2026 Medicare rate & RVUs in Chicago, IL

A medical physicist performs a physician-requested, case-specific analysis or measurement for unusual radiation treatment circumstances beyond routine planning and review.

CMS RVU26DEffective Oct 1, 2026One payment locality12K Medicare services in 2024

In Chicago, IL, Medicare pays $158.19 for 77370 in the office.

$158.19Office (non-facility)
Not available in this settingHospital or facility
+4.8%vs the national office rate ($150.97)

Check a contract rate as a % of Medicare · 77370 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 77370 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Chicago, IL
  2. What 77370 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 77370 covers

A radiation oncologist may request a medical physicist’s focused analysis when a patient’s treatment presents unusual technical circumstances. The physicist may perform case-specific calculations or measurements and assess how those findings affect the treatment setup or delivery. This work is distinct from routine dose planning and ongoing physics review during a course of radiation therapy.

Report 77370 for the special technical consultation, supported by the physician’s request and a written physicist report describing the unusual circumstance, work performed, and findings. The record should show why routine planning or review was insufficient. CMS classifies this as a technical-component-only code; a separate code covers interpretation. The fee schedule assigns no physician work RVUs to this code, reflecting that its reported service is the technical physics work rather than interpretation.

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 Chicago, IL compares for 77370

Across 109 of 109 payment localities, the office rate for 77370 runs from $127.96 in Arkansas to $213.16 in San Benito County, CA. Chicago, IL pays $158.19. The RVUs are the same everywhere; the geographic indexes change the dollars.

77370 in Chicago, IL vs other payment areas
  1. Chicago, IL · this page$158.19
  2. East St. Louis, IL · Illinois$144.38−$13.81
  3. Rest of Illinois · Illinois$141.09−$17.10
  4. Suburban Chicago, IL · Illinois$158.78+$0.59
  5. Los Angeles, CA · California$176.00+$17.81
  6. Washington, DC area · District of Columbia$177.52+$19.33
  7. Miami, FL · Florida$164.62+$6.43

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

Every other payment area

77370 in every other Medicare payment locality
Payment localityOfficeFacility
Manhattan, NYNew York$177.55—
AlaskaAlaska$158.21—
AlabamaAlabama$130.55—
ArkansasArkansas$127.96—
ArizonaArizona$145.73—
Bakersfield, CACalifornia$163.03—
Chico, CACalifornia$162.66—
El Centro, CACalifornia$162.68—

77370 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.

$127.96

$187.91

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

View every state and territory as a table
77370 office rate range by state
State / territoryOffice rate rangeLocalities
AK$158.211
AL$130.551
AR$127.961
AZ$145.731
CA$162.66–$213.1629
CO$159.221
CT$163.261
DC$177.521
DE$148.711
FL$147.07–$164.623
GA$136.17–$154.312
GU$168.861
HI$168.861
IA$135.541
ID$136.651
IL$141.09–$158.784
IN$137.741
KS$134.471
KY$134.341
LA$133.98–$143.042
MA$157.69–$178.742
MD$152.31–$177.523
ME$137.40–$147.812
MI$138.92–$149.302
MN$151.681
MO$130.70–$143.983
MS$129.381
MT$150.961
NC$139.381
ND$148.001
NE$136.621
NH$156.331
NJ$164.89–$174.672
NM$139.861
NV$150.281
NY$142.19–$182.855
OH$138.311
OK$134.241
OR$148.90–$165.892
PA$138.73–$157.922
PR$152.501
RI$155.251
SC$139.131
SD$147.651
TN$135.371
TX$137.48–$158.878
UT$141.701
VA$147.02–$177.522
VI$152.501
VT$147.041
WA$157.51–$183.192
WI$141.371
WV$134.011
WY$149.671

See 77370 in every payment locality

How the 77370 rate is calculated

Each of 77370’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 · 77370

RVUs × geographic indexes × conversion factor

Office or facility?

Work0.00

0.00 RVUs× 1.000 GPCI

Practice expense4.37

4.37 RVUs× 1.000 GPCI

Malpractice0.15

0.15 RVUs× 1.000 GPCI

Adjusted RVUs

4.5200

Conversion factor

$33.4009

Medicare rate

$150.97

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

The exact Chicago, IL inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

9,087

Code
77370
Physician work
0.00
Practice expense
4.37
Malpractice
0.15

GPCI2026.csv

48

Locality
Chicago, IL
Physician work
1.007
Practice expense
1.005
Malpractice
2.295
Office calculation for 77370 in Chicago, IL
ComponentRVULocality factorAdjusted
Physician work0.00× 1.0070.0000
Practice expense4.37× 1.0054.3918
Malpractice0.15× 2.2950.3443
Total RVUs4.7361
Conversion factor× 33.4009

Office rate, Chicago, IL$158.19

Office: (0 × 1.007 + 4.37 × 1.005 + 0.15 × 2.295) × $33.4009 = $158.19

Open 77370 in the RVU calculator

Payment rules and modifiers for 77370

The CMS indicators that decide how 77370 is paid alongside other services.

CMS payment indicators · 77370

Radiation physics consult, unusual treatment circumstances

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/technical3Technical component only.

Codes related to 77370

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

Codes related to 77370
CodeHow it relatesOffice range, Chicago, IL
Used instead
77336Physics review, per week of therapyUsed for ongoing physics review during treatment rather than a special case-specific consultation.$95.66
77300Dosimetry calculation, basic, per calculationReports a dose calculation when routine calculation work, not a special consultation, is performed.$69.24
Often billed with
77301IMRT planning, dose optimization and volume analysisIMRT planning may accompany a separately documented special physics consultation.$2,000.78

How 77370 has changed in Chicago, IL

77370 · Office / nonfacility

$158.19

Effective 2026-10-01

The base rate is $4.13 higher than on 2025-10-01, moving from $154.06 to $158.19 (2.7%).

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

    $154.06changed to$158.19

    • Conversion factor 32.3465 changed to 33.4009
    • Practice expense RVU 4.34 changed to 4.37
    • Malpractice RVU 0.16 changed to 0.15
    • Practice expense GPCI 1.023 changed to 1.005
    • Malpractice GPCI 2.018 changed to 2.295

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $152.76changed to$154.06

    • Conversion factor 33.2875 changed to 32.3465
    • Practice expense RVU 4.19 changed to 4.34
    • Malpractice RVU 0.15 changed to 0.16

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $150.27changed to$152.76

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $149.60changed to$150.27

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 4.01 changed to 4.19
    • Malpractice RVU 0.14 changed to 0.15
    • Work GPCI 1.009 changed to 1.007
    • Practice expense GPCI 1.033 changed to 1.023
    • Malpractice GPCI 1.945 changed to 2.018

  5. January 1, 2023

    RVU23A

    $143.25changed to$149.60

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 3.75 changed to 4.01
    • Malpractice RVU 0.12 changed to 0.14
    • Work GPCI 1.011 changed to 1.009
    • Practice expense GPCI 1.044 changed to 1.033
    • Malpractice GPCI 1.871 changed to 1.945

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $140.36changed to$143.25

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 3.62 changed to 3.75
    • Malpractice RVU 0.13 changed to 0.12

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $135.02changed to$140.36

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 3.40 changed to 3.62
    • Malpractice RVU 0.11 changed to 0.13
    • Work GPCI 1.009 changed to 1.011
    • Practice expense GPCI 1.039 changed to 1.044
    • Malpractice GPCI 1.898 changed to 1.871

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $135.02changed to$135.02

    • Conversion factor 36.0391 changed to 36.0896
    • Malpractice RVU 0.12 changed to 0.11
    • Work GPCI 1.008 changed to 1.009
    • Practice expense GPCI 1.034 changed to 1.039
    • Malpractice GPCI 1.925 changed to 1.898

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $135.62changed to$135.02

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 3.42 changed to 3.40

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $132.68changed to$135.62

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 3.34 changed to 3.42
    • Work GPCI 1.012 changed to 1.008
    • Practice expense GPCI 1.036 changed to 1.034
    • Malpractice GPCI 1.972 changed to 1.925

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $131.94changed to$132.68

    • Conversion factor 35.8043 changed to 35.8887
    • Practice expense RVU 3.32 changed to 3.34
    • Work GPCI 1.016 changed to 1.012
    • Practice expense GPCI 1.037 changed to 1.036
    • Malpractice GPCI 2.019 changed to 1.972

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $123.26changed to$131.94

    • Conversion factor 35.9335 changed to 35.8043
    • Practice expense RVU 3.23 changed to 3.32
    • Malpractice RVU 0.04 changed to 0.12

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $122.65changed to$123.26

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $121.12changed to$122.65

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 3.16 changed to 3.23
    • Work GPCI 1.023 changed to 1.016
    • Practice expense GPCI 1.044 changed to 1.037
    • Malpractice GPCI 2.048 changed to 2.019

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $125.48changed to$121.12

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 3.43 changed to 3.16
    • Work GPCI 1.030 changed to 1.023
    • Practice expense GPCI 1.051 changed to 1.044
    • Malpractice GPCI 2.077 changed to 2.048

    Held through RVU14B, RVU14C, RVU14D.

  16. October 1, 2013

    RVU13D

    No ratechanged to$125.48

  17. January 1, 2013

    RVU13AR

    Earliest loaded release: No rate

    Held through RVU13B, RVU13C.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$158.19Not available in this settingRVU26D
2026-07-01$158.19Not available in this settingRVU26C
2026-04-01$158.19Not available in this settingRVU26B
2026-01-01$158.19Not available in this settingRVU26A
2025-10-01$154.06Not available in this settingRVU25D
2025-07-01$154.06Not available in this settingRVU25C
2025-04-01$154.06Not available in this settingRVU25B
2025-01-01$154.06Not available in this settingRVU25A
2024-10-01$152.76Not available in this settingRVU24D
2024-07-01$152.76Not available in this settingRVU24C
2024-04-01$152.76Not available in this settingRVU24B
2024-03-09$152.76Not available in this settingRVU24AR
2024-01-01$150.27Not available in this settingRVU24A
2023-10-01$149.60Not available in this settingRVU23D
2023-07-01$149.60Not available in this settingRVU23C
2023-04-01$149.60Not available in this settingRVU23B
2023-01-01$149.60Not available in this settingRVU23A
2022-10-01$143.25Not available in this settingRVU22D
2022-07-01$143.25Not available in this settingRVU22C
2022-04-01$143.25Not available in this settingRVU22B
2022-01-01$143.25Not available in this settingRVU22A
2021-10-01$140.36Not available in this settingRVU21D
2021-07-01$140.36Not available in this settingRVU21C
2021-04-01$140.36Not available in this settingRVU21B
2021-01-01$140.36Not available in this settingRVU21A
2020-10-01$135.02Not available in this settingRVU20D
2020-07-01$135.02Not available in this settingRVU20C
2020-04-01$135.02Not available in this settingRVU20B
2020-01-01$135.02Not available in this settingRVU20A
2019-10-01$135.02Not available in this settingRVU19D
2019-07-01$135.02Not available in this settingRVU19C
2019-04-01$135.02Not available in this settingRVU19B
2019-01-01$135.02Not available in this settingRVU19A
2018-10-01$135.62Not available in this settingRVU18D
2018-07-01$135.62Not available in this settingRVU18C
2018-04-01$135.62Not available in this settingRVU18B
2018-01-01$135.62Not available in this settingRVU18AR1
2017-10-01$132.68Not available in this settingRVU17D
2017-07-01$132.68Not available in this settingRVU17C
2017-04-01$132.68Not available in this settingRVU17B
2017-01-01$132.68Not available in this settingRVU17A
2016-10-01$131.94Not available in this settingRVU16D
2016-07-01$131.94Not available in this settingRVU16C
2016-04-01$131.94Not available in this settingRVU16B
2016-01-01$131.94Not available in this settingRVU16A
2015-10-01$123.26Not available in this settingRVU15D
2015-07-01$123.26Not available in this settingRVU15C
2015-04-01$122.65Not available in this settingRVU15B
2015-01-01$122.65Not available in this settingRVU15A
2014-10-01$121.12Not available in this settingRVU14D
2014-07-01$121.12Not available in this settingRVU14C
2014-04-01$121.12Not available in this settingRVU14B
2014-01-01$121.12Not available in this settingRVU14A
2013-10-01$125.48Not available in this settingRVU13D
2013-07-01Rate data unavailableNot available in this settingRVU13C
2013-04-01Rate data unavailableNot available in this settingRVU13B
2013-01-01Rate data unavailableNot available in this settingRVU13AR

Price 77370 for an earlier date of service

Where the Chicago, IL rate applies

Chicago, IL is a Medicare payment area, not a city. Our Census mapping connects it to 137 cities and communities in Illinois. Some span more than one payment area; confirm with the service ZIP.

Browse all communities in Illinois

77370 billing questions

How does 77370 differ from 77336?

Use 77370 for a physician-requested, case-specific physics analysis prompted by unusual treatment circumstances. Code 77336 represents ongoing physics review during a radiation treatment course.

Can routine dose calculation be reported as 77370?

No. A routine dose calculation is distinct from the special consultation reported with 77370; document the unusual circumstance and the additional physics work.

Does 77370 include the physician’s interpretation?

CMS identifies 77370 as technical-component-only. Interpretation is covered by a separate code.

What documentation supports 77370?

Keep the radiation oncologist’s request and the physicist’s report. The report should identify the unusual treatment issue, the calculations or measurements performed, and the resulting findings.

Is 77370 reported for every complex radiation plan?

No. Complexity alone is not the service; the record should support a distinct, physician-requested physics consultation beyond routine planning or review.

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 77370PPRRVU2026_Oct_nonQPP.csv, line 9,087 (RVU26D)
Geographic factors for Chicago, ILGPCI2026.csv, line 48 (RVU26D)

Open CMS sourceHow we calculate rates

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