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CPT code 77321: Radiation plan, special port plan2026 Medicare rate & RVUs in Connecticut

A special teletherapy port plan supports radiation treatment using nonstandard field arrangements, such as mantle or inverted-Y fields, when standard isodose planning categories do not fit.

CMS RVU26DEffective Oct 1, 2026One payment locality11K Medicare services in 2024

In Connecticut, Medicare pays $100.25 for 77321 in the office.

$100.25Office (non-facility)
Not available in this settingHospital or facility
+6.1%vs the national office rate ($94.52)

Check a contract rate as a % of Medicare · 77321 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 77321 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Connecticut
  2. What 77321 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 77321 covers

A radiation oncologist and the radiation physics team use this planning service to develop a special external-beam treatment arrangement. It is associated with distinctive field designs such as mantle or inverted-Y fields, rather than routine teletherapy isodose plans. The planning work supports the prescribed treatment geometry and dose distribution in radiation oncology settings.

Report 77321 when the documented plan is a special teletherapy port plan, not merely because a conventional plan involves multiple fields or is technically demanding. The record should identify the treatment arrangement and support why this special plan category was used. CMS separately prices the professional and technical components: modifier 26 represents the professional interpretation, and modifier TC represents the technical work, equipment, and staff. Reporting without either 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.

How Connecticut compares for 77321

Across 109 of 109 payment localities, the office rate for 77321 runs from $85.00 in Arkansas to $124.48 in San Benito County, CA. Connecticut pays $100.25. The RVUs are the same everywhere; the geographic indexes change the dollars.

77321 in Connecticut vs other payment areas
  1. Connecticut · this page$100.25
  2. Los Angeles, CA · California$106.54+$6.29
  3. Washington, DC area · District of Columbia$107.39+$7.14
  4. Miami, FL · Florida$99.61−$0.64
  5. Chicago, IL · Illinois$97.21−$3.04
  6. Manhattan, NY · New York$107.50+$7.25
  7. Alaska · Alaska$113.32+$13.07

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

Every other payment area

77321 in every other Medicare payment locality
Payment localityOfficeFacility
AlabamaAlabama$86.08—
ArkansasArkansas$85.00—
ArizonaArizona$92.37—
Bakersfield, CACalifornia$100.39—
Chico, CACalifornia$100.21—
El Centro, CACalifornia$100.22—
Fresno, CACalifornia$100.21—
Hanford, CACalifornia$100.21—

77321 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.

$85.00

$113.32

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

View every state and territory as a table
77321 office rate range by state
State / territoryOffice rate rangeLocalities
AK$113.321
AL$86.081
AR$85.001
AZ$92.371
CA$100.21–$124.4829
CO$98.491
CT$100.251
DC$107.391
DE$93.771
FL$92.65–$99.613
GA$88.17–$95.942
GU$102.291
HI$102.291
IA$88.271
ID$88.701
IL$90.09–$97.704
IN$89.161
KS$87.761
KY$87.521
LA$87.35–$91.112
MA$97.96–$107.602
MD$95.44–$107.393
ME$88.95–$93.352
MI$89.36–$93.512
MN$95.141
MO$85.95–$91.563
MS$85.501
MT$94.521
NC$89.781
ND$93.531
NE$88.731
NH$96.851
NJ$101.61–$106.482
NM$89.731
NV$94.311
NY$90.94–$109.625
OH$89.161
OK$87.541
OR$93.78–$101.452
PA$89.37–$97.942
PR$95.181
RI$96.971
SC$89.581
SD$93.421
TN$88.131
TX$88.84–$97.988
UT$90.651
VA$92.98–$107.392
VI$95.181
VT$93.081
WA$97.80–$109.802
WI$90.771
WV$87.151
WY$94.091

See 77321 in every payment locality

How the 77321 rate is calculated

Each of 77321’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 · 77321

RVUs × geographic indexes × conversion factor

Office or facility?

Work0.93

0.93 RVUs× 1.000 GPCI

Practice expense1.85

1.85 RVUs× 1.000 GPCI

Malpractice0.05

0.05 RVUs× 1.000 GPCI

Adjusted RVUs

2.8300

Conversion factor

$33.4009

Medicare rate

$94.52

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

The exact Connecticut inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

9,068

Code
77321
Physician work
0.93
Practice expense
1.85
Malpractice
0.05

GPCI2026.csv

38

Locality
Connecticut
Physician work
1.020
Practice expense
1.077
Malpractice
1.210
Office calculation for 77321 in Connecticut
ComponentRVULocality factorAdjusted
Physician work0.93× 1.0200.9486
Practice expense1.85× 1.0771.9925
Malpractice0.05× 1.2100.0605
Total RVUs3.0015
Conversion factor× 33.4009

Office rate, Connecticut$100.25

Office: (0.93 × 1.02 + 1.85 × 1.077 + 0.05 × 1.21) × $33.4009 = $100.25

Open 77321 in the RVU calculator

Payment rules and modifiers for 77321

The CMS indicators that decide how 77321 is paid alongside other services.

CMS payment indicators · 77321

Radiation plan, special port plan

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

77321 without 26 · national office

$94.52

Radiation plan, special port plan

77321-26 · Professional component

$49.77

Pays only the interpretation and report.

When to use modifier 26

Codes related to 77321

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

Codes related to 77321
CodeHow it relatesOffice range, Connecticut
Used instead
77306Radiation plan, simple teletherapy planUsed for a simple teletherapy isodose plan rather than a special port plan.$159.62
77307Isodose planning, complex teletherapy planUsed for a complex teletherapy isodose plan when the plan is not a special port plan.$307.93
77301IMRT planning, dose optimization and volume analysisUsed for IMRT planning, a different treatment-planning method.$2,099.52
Often billed with
77300Dosimetry calculation, basic, per calculationA separately performed basic radiation dosimetry calculation may accompany the port plan.$71.34

How 77321 has changed in Connecticut

77321 · Office / nonfacility

$100.25

Effective 2026-10-01

The base rate is $1.25 higher than on 2025-10-01, moving from $99.00 to $100.25 (1.3%).

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

    $99.00changed to$100.25

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 0.95 changed to 0.93
    • Practice expense RVU 1.86 changed to 1.85
    • Work GPCI 1.022 changed to 1.020
    • Practice expense GPCI 1.091 changed to 1.077
    • Malpractice GPCI 1.207 changed to 1.210

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $100.79changed to$99.00

    • Conversion factor 33.2875 changed to 32.3465
    • Practice expense RVU 1.83 changed to 1.86

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $99.14changed to$100.79

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $102.19changed to$99.14

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 1.80 changed to 1.83
    • Work GPCI 1.030 changed to 1.022
    • Practice expense GPCI 1.102 changed to 1.091
    • Malpractice GPCI 1.070 changed to 1.207

  5. January 1, 2023

    RVU23A

    $102.79changed to$102.19

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 1.74 changed to 1.80
    • Work GPCI 1.037 changed to 1.030
    • Practice expense GPCI 1.114 changed to 1.102
    • Malpractice GPCI 0.934 changed to 1.070

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $104.03changed to$102.79

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 1.75 changed to 1.74

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $104.73changed to$104.03

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 1.67 changed to 1.75
    • Malpractice RVU 0.06 changed to 0.05
    • Work GPCI 1.029 changed to 1.037
    • Practice expense GPCI 1.113 changed to 1.114
    • Malpractice GPCI 1.094 changed to 0.934

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $103.74changed to$104.73

    • Conversion factor 36.0391 changed to 36.0896
    • Practice expense RVU 1.66 changed to 1.67
    • Malpractice RVU 0.05 changed to 0.06
    • Work GPCI 1.021 changed to 1.029
    • Practice expense GPCI 1.112 changed to 1.113
    • Malpractice GPCI 1.255 changed to 1.094

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $104.43changed to$103.74

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 1.68 changed to 1.66

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $102.85changed to$104.43

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 1.64 changed to 1.68
    • Work GPCI 1.023 changed to 1.021
    • Practice expense GPCI 1.117 changed to 1.112
    • Malpractice GPCI 1.244 changed to 1.255

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $102.06changed to$102.85

    • Conversion factor 35.8043 changed to 35.8887
    • Practice expense RVU 1.62 changed to 1.64
    • Work GPCI 1.024 changed to 1.023
    • Practice expense GPCI 1.121 changed to 1.117
    • Malpractice GPCI 1.232 changed to 1.244

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $100.81changed to$102.06

    • Conversion factor 35.9335 changed to 35.8043
    • Practice expense RVU 1.58 changed to 1.62

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $100.31changed to$100.81

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $99.42changed to$100.31

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 1.56 changed to 1.58
    • Practice expense GPCI 1.116 changed to 1.121
    • Malpractice GPCI 1.234 changed to 1.232

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $98.27changed to$99.42

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 1.67 changed to 1.56
    • Practice expense GPCI 1.110 changed to 1.116
    • Malpractice GPCI 1.235 changed to 1.234

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: $98.27

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$100.25Not available in this settingRVU26D
2026-07-01$100.25Not available in this settingRVU26C
2026-04-01$100.25Not available in this settingRVU26B
2026-01-01$100.25Not available in this settingRVU26A
2025-10-01$99.00Not available in this settingRVU25D
2025-07-01$99.00Not available in this settingRVU25C
2025-04-01$99.00Not available in this settingRVU25B
2025-01-01$99.00Not available in this settingRVU25A
2024-10-01$100.79Not available in this settingRVU24D
2024-07-01$100.79Not available in this settingRVU24C
2024-04-01$100.79Not available in this settingRVU24B
2024-03-09$100.79Not available in this settingRVU24AR
2024-01-01$99.14Not available in this settingRVU24A
2023-10-01$102.19Not available in this settingRVU23D
2023-07-01$102.19Not available in this settingRVU23C
2023-04-01$102.19Not available in this settingRVU23B
2023-01-01$102.19Not available in this settingRVU23A
2022-10-01$102.79Not available in this settingRVU22D
2022-07-01$102.79Not available in this settingRVU22C
2022-04-01$102.79Not available in this settingRVU22B
2022-01-01$102.79Not available in this settingRVU22A
2021-10-01$104.03Not available in this settingRVU21D
2021-07-01$104.03Not available in this settingRVU21C
2021-04-01$104.03Not available in this settingRVU21B
2021-01-01$104.03Not available in this settingRVU21A
2020-10-01$104.73Not available in this settingRVU20D
2020-07-01$104.73Not available in this settingRVU20C
2020-04-01$104.73Not available in this settingRVU20B
2020-01-01$104.73Not available in this settingRVU20A
2019-10-01$103.74Not available in this settingRVU19D
2019-07-01$103.74Not available in this settingRVU19C
2019-04-01$103.74Not available in this settingRVU19B
2019-01-01$103.74Not available in this settingRVU19A
2018-10-01$104.43Not available in this settingRVU18D
2018-07-01$104.43Not available in this settingRVU18C
2018-04-01$104.43Not available in this settingRVU18B
2018-01-01$104.43Not available in this settingRVU18AR1
2017-10-01$102.85Not available in this settingRVU17D
2017-07-01$102.85Not available in this settingRVU17C
2017-04-01$102.85Not available in this settingRVU17B
2017-01-01$102.85Not available in this settingRVU17A
2016-10-01$102.06Not available in this settingRVU16D
2016-07-01$102.06Not available in this settingRVU16C
2016-04-01$102.06Not available in this settingRVU16B
2016-01-01$102.06Not available in this settingRVU16A
2015-10-01$100.81Not available in this settingRVU15D
2015-07-01$100.81Not available in this settingRVU15C
2015-04-01$100.31Not available in this settingRVU15B
2015-01-01$100.31Not available in this settingRVU15A
2014-10-01$99.42Not available in this settingRVU14D
2014-07-01$99.42Not available in this settingRVU14C
2014-04-01$99.42Not available in this settingRVU14B
2014-01-01$99.42Not available in this settingRVU14A
2013-10-01$98.27Not available in this settingRVU13D
2013-07-01$98.27Not available in this settingRVU13C
2013-04-01$98.27Not available in this settingRVU13B
2013-01-01$98.27Not available in this settingRVU13AR

Price 77321 for an earlier date of service

Where the Connecticut rate applies

Connecticut is a Medicare payment area, not a city. Our Census mapping connects it to 215 cities and communities in Connecticut. Some span more than one payment area; confirm with the service ZIP.

  • Ansonia
  • Ball Pond
  • Baltic
  • Bantam
  • Bethel
  • Bethlehem Village
  • Bigelow Corners
  • Blue Hills

Browse all communities in Connecticut

77321 billing questions

When should 77321 be chosen instead of 77306 or 77307?

Use 77321 for a special teletherapy port arrangement, such as a mantle or inverted-Y field. Codes 77306 and 77307 describe simple or complex teletherapy isodose plans, respectively.

Does a plan qualify for 77321 just because it is complex?

No. The documentation should support a special port plan, rather than relying only on the number of fields or the general difficulty of planning.

How are the professional and technical components reported?

Modifier 26 identifies the professional component, and modifier TC identifies the technical component. Without either modifier, the claim represents the global service.

Can 77300 be reported with 77321?

A separately performed basic radiation dosimetry calculation may be reported with the plan when the record supports that distinct work.

What documentation supports 77321?

Document the special field arrangement and the planning work performed. The record should make clear why the service is a special port plan rather than a routine simple or complex isodose plan.

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 77321PPRRVU2026_Oct_nonQPP.csv, line 9,068 (RVU26D)
Geographic factors for ConnecticutGPCI2026.csv, line 38 (RVU26D)

Open CMS sourceHow we calculate rates

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