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CPT code 36228: Intracranial catheterization, additional intracranial branch2026 Medicare rate & RVUs in Baltimore area, MD

Reports selective catheter placement and angiography of an additional intracranial branch, such as an anterior or middle cerebral artery branch, during cerebral angiography.

CMS RVU26DEffective Oct 1, 2026One payment locality2K Medicare services in 2024

In Baltimore area, MD, Medicare pays $1,653.57 for 36228 in the office and $241.15 when it’s performed in a hospital or facility.

$1,653.57Office (non-facility)
$241.15Hospital or facility
+7.3%vs the national office rate ($1,541.12)

Check a contract rate as a % of Medicare · 36228 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 36228 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Baltimore area, MD
  2. What 36228 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 36228 covers

This add-on describes selective catheterization of an additional second- or third-order intracranial branch within a vascular family, with angiography of the selected vessel and its supplied intracranial branches when performed. Neurointerventional physicians and other physicians performing diagnostic cerebral angiography may use it when they advance the catheter beyond an internal carotid or vertebral artery into a qualifying intracranial branch. The service is commonly performed in a hospital angiography suite.

Report 36228 with the applicable primary angiography service, commonly 36224 for an internal carotid artery study or 36226 for a vertebral artery study; it is not reported alone. Documentation should identify the vascular family, the additional branch selectively catheterized, and the angiography performed. Report the code for each qualifying additional branch. It is an add-on paid within the primary procedure's global period. For a bilateral procedure reported with modifier 50, CMS pays 150% of the single-procedure amount.

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 Baltimore area, MD compares for 36228

Across 109 of 109 payment localities, the office rate for 36228 runs from $1,326.89 in Arkansas to $2,133.11 in San Benito County, CA. Baltimore area, MD pays $1,653.57. The RVUs are the same everywhere; the geographic indexes change the dollars.

36228 in Baltimore area, MD vs other payment areas
  1. Baltimore area, MD · this page$1,653.57
  2. Rest of Maryland · Maryland$1,554.84−$98.73
  3. Los Angeles, CA · California$1,778.72+$125.15
  4. Washington, DC area · District of Columbia$1,795.19+$141.62
  5. Miami, FL · Florida$1,669.71+$16.14
  6. Chicago, IL · Illinois$1,610.71−$42.86
  7. Manhattan, NY · New York$1,797.48+$143.91

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

Every other payment area

36228 in every other Medicare payment locality
Payment localityOfficeFacility
AlaskaAlaska$1,676.89$275.00
AlabamaAlabama$1,351.00$199.22
ArkansasArkansas$1,326.89$196.16
ArizonaArizona$1,492.23$216.71
Bakersfield, CACalifornia$1,655.16$212.46
Chico, CACalifornia$1,651.39$208.70
El Centro, CACalifornia$1,651.63$208.93
Fresno, CACalifornia$1,651.39$208.70

36228 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.

$1,326.89

$1,892.25

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

View every state and territory as a table
36228 office rate range by state
State / territoryOffice rate rangeLocalities
AK$1,676.891
AL$1,351.001
AR$1,326.891
AZ$1,492.231
CA$1,651.39–$2,133.1129
CO$1,619.041
CT$1,658.251
DC$1,795.191
DE$1,520.721
FL$1,505.52–$1,669.713
GA$1,403.94–$1,572.812
GU$1,706.651
HI$1,706.651
IA$1,397.131
ID$1,407.541
IL$1,450.12–$1,615.554
IN$1,417.651
KS$1,387.341
KY$1,386.641
LA$1,383.28–$1,467.662
MA$1,605.45–$1,804.422
MD$1,554.84–$1,795.193
ME$1,414.66–$1,511.302
MI$1,429.39–$1,526.462
MN$1,546.791
MO$1,352.88–$1,476.173
MS$1,340.301
MT$1,541.021
NC$1,433.081
ND$1,512.751
NE$1,407.071
NH$1,590.711
NJ$1,675.95–$1,769.892
NM$1,438.251
NV$1,534.501
NY$1,459.18–$1,847.015
OH$1,423.611
OK$1,385.471
OR$1,521.51–$1,681.522
PA$1,427.37–$1,608.382
PR$1,555.311
RI$1,583.301
SC$1,430.971
SD$1,509.401
TN$1,395.691
TX$1,415.77–$1,614.548
UT$1,454.941
VA$1,504.04–$1,795.192
VI$1,555.311
VT$1,503.971
WA$1,603.32–$1,846.892
WI$1,451.151
WV$1,384.191
WY$1,528.701

See 36228 in every payment locality

How the 36228 rate is calculated

Each of 36228’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 · 36228

RVUs × geographic indexes × conversion factor

Office or facility?

Work4.14

4.14 RVUs× 1.000 GPCI

Practice expense40.57

40.57 RVUs× 1.000 GPCI

Malpractice1.43

1.43 RVUs× 1.000 GPCI

Adjusted RVUs

46.1400

Conversion factor

$33.4009

Medicare rate

$1,541.12

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

The exact Baltimore area, MD inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

4,454

Code
36228
Physician work
4.14
Practice expense
40.57
Malpractice
1.43

GPCI2026.csv

60

Locality
Baltimore area, MD
Physician work
1.016
Practice expense
1.073
Malpractice
1.237
Office calculation for 36228 in Baltimore area, MD
ComponentRVULocality factorAdjusted
Physician work4.14× 1.0164.2062
Practice expense40.57× 1.07343.5316
Malpractice1.43× 1.2371.7689
Total RVUs49.5068
Conversion factor× 33.4009

Office rate, Baltimore area, MD$1653.57

Office: (4.14 × 1.016 + 40.57 × 1.073 + 1.43 × 1.237) × $33.4009 = $1653.57

Facility: (4.14 × 1.016 + 1.16 × 1.073 + 1.43 × 1.237) × $33.4009 = $241.15

Open 36228 in the RVU calculator

Payment rules and modifiers for 36228

The CMS indicators that decide how 36228 is paid alongside other services.

CMS payment indicators · 36228

Intracranial catheterization, additional intracranial branch

RuleCMS valueWhat it means
Global periodZZZAdd-on code: falls within the primary procedure’s global period.
Multiple procedures0No multiple-procedure reduction.
Bilateral (modifier 50)1Bilateral with modifier 50 pays 150% of the fee schedule amount.
Assistant at surgery (80/81/82/AS)1Not paid (statutory restriction).
Co-surgeons (62)0Not permitted.
Team surgery (66)0Not permitted.
Professional/technical0Physician service: no professional/technical split.

What modifiers do to the payment

Modifier 50 · payment effect

With and without the modifier

36228 without 50 · national office

$1,541.12

Intracranial catheterization, additional intracranial branch

36228-50 · Bilateral: 150%

$2,311.68

Both sides on one line with modifier 50 are paid at 150% of the fee schedule amount (subject to multiple-procedure rules with other procedures).

When to use modifier 50

Codes related to 36228

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

Codes related to 36228
CodeHow it relatesOffice range, Baltimore area, MD
Primary code
36224Carotid angiography, internal carotid, both circulationsCommon primary internal carotid angiography service for an additional intracranial branch.$2,521.14
36226Vertebral angiography, direct vertebral selectionCommon primary vertebral artery angiography service for an additional intracranial branch.$2,451.76
Same family
36223Carotid angiography, ipsilateral intracranial circulationCervicocerebral angiography code with intracranial imaging from carotid or innominate catheter placement.$2,054.06
36227External carotid angiography, selective placement, unilateralCervicocerebral angiography code for selective external carotid catheterization and imaging.$293.20

How 36228 has changed in Baltimore area, MD

36228 · Office / nonfacility

$1653.57

Effective 2026-10-01

The base rate is $303.45 higher than on 2025-10-01, moving from $1350.12 to $1653.57 (22.5%).

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

    $1350.12changed to$1653.57

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 4.25 changed to 4.14
    • Practice expense RVU 33.01 changed to 40.57
    • Malpractice RVU 1.39 changed to 1.43
    • Work GPCI 1.020 changed to 1.016
    • Practice expense GPCI 1.078 changed to 1.073
    • Malpractice GPCI 1.309 changed to 1.237

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $1384.14changed to$1350.12

    • Conversion factor 33.2875 changed to 32.3465
    • Practice expense RVU 32.90 changed to 33.01
    • Malpractice RVU 1.36 changed to 1.39

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $1361.55changed to$1384.14

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $1394.13changed to$1361.55

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 32.30 changed to 32.90
    • Malpractice RVU 1.28 changed to 1.36
    • Work GPCI 1.024 changed to 1.020
    • Practice expense GPCI 1.087 changed to 1.078
    • Malpractice GPCI 1.311 changed to 1.309

  5. January 1, 2023

    RVU23A

    $1449.62changed to$1394.13

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 32.82 changed to 32.30
    • Malpractice RVU 1.18 changed to 1.28
    • Work GPCI 1.028 changed to 1.024
    • Practice expense GPCI 1.096 changed to 1.087
    • Malpractice GPCI 1.313 changed to 1.311

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $1518.93changed to$1449.62

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 34.39 changed to 32.82
    • Malpractice RVU 1.12 changed to 1.18

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $1486.13changed to$1518.93

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 32.35 changed to 34.39
    • Malpractice RVU 1.07 changed to 1.12
    • Work GPCI 1.026 changed to 1.028
    • Practice expense GPCI 1.095 changed to 1.096
    • Malpractice GPCI 1.304 changed to 1.313

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $1482.57changed to$1486.13

    • Conversion factor 36.0391 changed to 36.0896
    • Practice expense RVU 32.25 changed to 32.35
    • Malpractice RVU 1.14 changed to 1.07
    • Work GPCI 1.023 changed to 1.026
    • Malpractice GPCI 1.295 changed to 1.304

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $1477.90changed to$1482.57

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 32.22 changed to 32.25
    • Malpractice RVU 1.10 changed to 1.14

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $1419.63changed to$1477.90

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 30.95 changed to 32.22
    • Malpractice RVU 1.04 changed to 1.10
    • Practice expense GPCI 1.096 changed to 1.095
    • Malpractice GPCI 1.238 changed to 1.295

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $1353.34changed to$1419.63

    • Conversion factor 35.8043 changed to 35.8887
    • Practice expense RVU 29.47 changed to 30.95
    • Malpractice RVU 0.95 changed to 1.04
    • Practice expense GPCI 1.097 changed to 1.096
    • Malpractice GPCI 1.181 changed to 1.238

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $1406.95changed to$1353.34

    • Conversion factor 35.9335 changed to 35.8043
    • Practice expense RVU 30.62 changed to 29.47
    • Malpractice RVU 1.03 changed to 0.95

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $1399.95changed to$1406.95

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $1296.34changed to$1399.95

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 28.32 changed to 30.62
    • Malpractice RVU 0.64 changed to 1.03
    • Work GPCI 1.025 changed to 1.023
    • Malpractice GPCI 1.194 changed to 1.181

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $1309.50changed to$1296.34

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 30.37 changed to 28.32
    • Malpractice RVU 0.67 changed to 0.64
    • Work GPCI 1.027 changed to 1.025
    • Malpractice GPCI 1.206 changed to 1.194

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: $1309.50

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$1,653.57$241.15RVU26D
2026-07-01$1,653.57$241.15RVU26C
2026-04-01$1,653.57$241.15RVU26B
2026-01-01$1,653.57$241.15RVU26A
2025-10-01$1,350.12$263.24RVU25D
2025-07-01$1,350.12$263.24RVU25C
2025-04-01$1,350.12$263.24RVU25B
2025-01-01$1,350.12$263.24RVU25A
2024-10-01$1,384.14$267.08RVU24D
2024-07-01$1,384.14$267.08RVU24C
2024-04-01$1,384.14$267.08RVU24B
2024-03-09$1,384.14$267.08RVU24AR
2024-01-01$1,361.55$262.72RVU24A
2023-10-01$1,394.13$268.07RVU23D
2023-07-01$1,394.13$268.07RVU23C
2023-04-01$1,394.13$268.07RVU23B
2023-01-01$1,394.13$268.07RVU23A
2022-10-01$1,449.62$269.67RVU22D
2022-07-01$1,449.62$269.67RVU22C
2022-04-01$1,449.62$269.67RVU22B
2022-01-01$1,449.62$269.67RVU22A
2021-10-01$1,518.93$269.16RVU21D
2021-07-01$1,518.93$269.16RVU21C
2021-04-01$1,518.93$269.16RVU21B
2021-01-01$1,518.93$269.16RVU21A
2020-10-01$1,486.13$273.32RVU20D
2020-07-01$1,486.13$273.32RVU20C
2020-04-01$1,486.13$273.32RVU20B
2020-01-01$1,486.13$273.32RVU20A
2019-10-01$1,482.57$274.61RVU19D
2019-07-01$1,482.57$274.61RVU19C
2019-04-01$1,482.57$274.61RVU19B
2019-01-01$1,482.57$274.61RVU19A
2018-10-01$1,477.90$272.45RVU18D
2018-07-01$1,477.90$272.45RVU18C
2018-04-01$1,477.90$272.45RVU18B
2018-01-01$1,477.90$272.45RVU18AR1
2017-10-01$1,419.63$266.36RVU17D
2017-07-01$1,419.63$266.36RVU17C
2017-04-01$1,419.63$266.36RVU17B
2017-01-01$1,419.63$266.36RVU17A
2016-10-01$1,353.34$258.29RVU16D
2016-07-01$1,353.34$258.29RVU16C
2016-04-01$1,353.34$258.29RVU16B
2016-01-01$1,353.34$258.29RVU16A
2015-10-01$1,406.95$263.41RVU15D
2015-07-01$1,406.95$263.41RVU15C
2015-04-01$1,399.95$262.09RVU15B
2015-01-01$1,399.95$262.09RVU15A
2014-10-01$1,296.34$245.12RVU14D
2014-07-01$1,296.34$245.12RVU14C
2014-04-01$1,296.34$245.12RVU14B
2014-01-01$1,296.34$245.12RVU14A
2013-10-01$1,309.50$237.20RVU13D
2013-07-01$1,309.50$237.20RVU13C
2013-04-01$1,309.50$237.20RVU13B
2013-01-01$1,309.50$237.20RVU13AR

Price 36228 for an earlier date of service

Where the Baltimore area, MD rate applies

Baltimore area, MD is a Medicare payment area, not a city. Our Census mapping connects it to 100 cities and communities in Maryland. Some span more than one payment area; confirm with the service ZIP.

  • Baltimore
  • Aberdeen
  • Aberdeen Proving Ground
  • Abingdon
  • Annapolis
  • Annapolis Neck
  • Arbutus
  • Arden on the Severn

Browse all communities in Maryland

36228 billing questions

When is 36228 reported instead of 36224 or 36226?

Use 36224 or 36226 for the applicable internal carotid or vertebral artery angiography service. Add 36228 when the catheter is selectively advanced into an additional qualifying intracranial branch within that vascular family.

Can 36228 be billed by itself?

No. It is an add-on code and must be reported with the applicable primary procedure, commonly 36224 or 36226.

How many units of 36228 should be reported?

Report a unit for each qualifying additional second- or third-order intracranial branch selectively catheterized. The record should identify each branch and the angiography performed.

What supports reporting 36228?

Document the parent vascular family, the specific additional intracranial branch entered selectively, and the imaging performed. Imaging branches from a catheter that remains in the internal carotid or vertebral artery alone does not establish this additional selective catheterization.

How is bilateral 36228 handled?

For a bilateral procedure reported with modifier 50, CMS pays 150% of the single-procedure amount. The add-on must still be reported with its applicable primary procedure.

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 36228PPRRVU2026_Oct_nonQPP.csv, line 4,454 (RVU26D)
Geographic factors for Baltimore area, MDGPCI2026.csv, line 60 (RVU26D)

Open CMS sourceHow we calculate rates

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