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CPT code 99183: Hyperbaric oxygen, professional service2026 Medicare rate & RVUs in Rhode Island

Reports the physician’s professional service for a hyperbaric oxygen treatment session, separately from the technical service for chamber treatment.

CMS RVU26DEffective Oct 1, 2026One payment locality295.6K Medicare services in 2024

In Rhode Island, Medicare pays $110.98 for 99183 in the office and $110.98 when it’s performed in a hospital or facility.

$110.98Office (non-facility)
$110.98Hospital or facility
+1.3%vs the national office rate ($109.55)

Check a contract rate as a % of Medicare · 99183 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 99183 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Rhode Island
  2. What 99183 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 99183 covers

Code 99183 represents the physician’s professional involvement in a hyperbaric oxygen treatment session. In a hospital or outpatient wound-care setting, the physician oversees the patient during treatment and documents the clinical assessment and response. Common treatment situations include selected diabetic lower-extremity wounds and tissue injury from radiation; the code represents the professional service, not the chamber or oxygen equipment.

Report the code for each documented session in which the physician provides the professional service. The record should identify the treatment session, the patient’s condition and relevant assessment, and the physician’s oversight and report. CMS identifies 99183 as a professional-component-only code; the technical portion is represented separately, commonly by HCPCS G0277 for hyperbaric oxygen under pressure in a full-body chamber. Keep documentation and claims distinct so the professional service is not mistaken for the chamber’s technical 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 Rhode Island compares for 99183

Across 109 of 109 payment localities, the office rate for 99183 runs from $100.82 in Arkansas to $142.14 in Alaska. Rhode Island pays $110.98. The RVUs are the same everywhere; the geographic indexes change the dollars.

99183 in Rhode Island vs other payment areas
  1. Rhode Island · this page$110.98
  2. Los Angeles, CA · California$115.33+$4.35
  3. Washington, DC area · District of Columbia$119.96+$8.98
  4. Miami, FL · Florida$124.15+$13.17
  5. Chicago, IL · Illinois$121.44+$10.46
  6. Manhattan, NY · New York$124.24+$13.26
  7. Alaska · Alaska$142.14+$31.16

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

Every other payment area

99183 in every other Medicare payment locality
Payment localityOfficeFacility
AlabamaAlabama$101.78$101.78
ArkansasArkansas$100.82$100.82
ArizonaArizona$107.31$107.31
Bakersfield, CACalifornia$110.54$110.54
Chico, CACalifornia$109.77$109.77
El Centro, CACalifornia$109.82$109.82
Fresno, CACalifornia$109.77$109.77
Hanford, CACalifornia$109.77$109.77

99183 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.

$100.82

$142.14

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

View every state and territory as a table
99183 office rate range by state
State / territoryOffice rate rangeLocalities
AK$142.141
AL$101.781
AR$100.821
AZ$107.311
CA$109.77–$127.2729
CO$110.531
CT$115.221
DC$119.961
DE$108.641
FL$112.51–$124.153
GA$107.76–$112.022
GU$110.291
HI$110.291
IA$101.591
ID$102.411
IL$111.65–$121.444
IN$102.751
KS$102.171
KY$105.261
LA$105.50–$108.842
MA$110.59–$117.642
MD$109.92–$119.963
ME$103.71–$106.062
MI$107.89–$114.392
MN$104.371
MO$104.90–$108.033
MS$102.831
MT$109.541
NC$104.271
ND$104.401
NE$101.681
NH$109.781
NJ$116.10–$119.612
NM$108.641
NV$108.141
NY$105.37–$127.465
OH$106.831
OK$104.191
OR$106.85–$111.992
PA$106.45–$113.782
PR$109.781
RI$110.981
SC$105.821
SD$103.791
TN$102.621
TX$106.05–$113.158
UT$106.751
VA$106.46–$119.962
VI$109.781
VT$104.941
WA$110.07–$118.682
WI$102.201
WV$109.101
WY$107.301

See 99183 in every payment locality

How the 99183 rate is calculated

Each of 99183’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 · 99183

RVUs × geographic indexes × conversion factor

Office or facility?

Work2.06

2.06 RVUs× 1.000 GPCI

Practice expense0.96

0.96 RVUs× 1.000 GPCI

Malpractice0.26

0.26 RVUs× 1.000 GPCI

Adjusted RVUs

3.2800

Conversion factor

$33.4009

Medicare rate

$109.55

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

The exact Rhode Island inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

13,001

Code
99183
Physician work
2.06
Practice expense
0.96
Malpractice
0.26

GPCI2026.csv

92

Locality
Rhode Island
Physician work
1.019
Practice expense
1.033
Malpractice
0.892
Office calculation for 99183 in Rhode Island
ComponentRVULocality factorAdjusted
Physician work2.06× 1.0192.0991
Practice expense0.96× 1.0330.9917
Malpractice0.26× 0.8920.2319
Total RVUs3.3227
Conversion factor× 33.4009

Office rate, Rhode Island$110.98

Office: (2.06 × 1.019 + 0.96 × 1.033 + 0.26 × 0.892) × $33.4009 = $110.98

Facility: (2.06 × 1.019 + 0.96 × 1.033 + 0.26 × 0.892) × $33.4009 = $110.98

Open 99183 in the RVU calculator

Payment rules and modifiers for 99183

The CMS indicators that decide how 99183 is paid alongside other services.

CMS payment indicators · 99183

Hyperbaric oxygen, professional service

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/technical2Professional component only.

Codes related to 99183

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

Codes related to 99183
CodeHow it relatesOffice range, Rhode Island
Often billed with
G0277Hyperbaric oxygen, full-body chamber, per 30 minutesCommonly reports the separate technical chamber service for the hyperbaric treatment session.$199.93

How 99183 has changed in Rhode Island

99183 · Office / nonfacility

$110.98

Effective 2026-10-01

The base rate is $7.39 higher than on 2025-10-01, moving from $103.59 to $110.98 (7.1%).

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

    $103.59changed to$110.98

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 2.11 changed to 2.06
    • Practice expense RVU 0.78 changed to 0.96
    • Malpractice RVU 0.27 changed to 0.26
    • Work GPCI 1.025 changed to 1.019
    • Practice expense GPCI 1.039 changed to 1.033
    • Malpractice GPCI 0.849 changed to 0.892

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $105.97changed to$103.59

    • Conversion factor 33.2875 changed to 32.3465
    • Practice expense RVU 0.77 changed to 0.78
    • Malpractice RVU 0.26 changed to 0.27

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $104.24changed to$105.97

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $108.45changed to$104.24

    • Conversion factor 33.8872 changed to 32.7442
    • Work GPCI 1.023 changed to 1.025
    • Practice expense GPCI 1.044 changed to 1.039
    • Malpractice GPCI 0.915 changed to 0.849

  5. January 1, 2023

    RVU23A

    $111.33changed to$108.45

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 0.78 changed to 0.77
    • Malpractice RVU 0.25 changed to 0.26
    • Work GPCI 1.021 changed to 1.023
    • Practice expense GPCI 1.048 changed to 1.044
    • Malpractice GPCI 0.981 changed to 0.915

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $112.59changed to$111.33

    • Conversion factor 34.8931 changed to 34.6062
    • Malpractice RVU 0.26 changed to 0.25

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $117.15changed to$112.59

    • Conversion factor 36.0896 changed to 34.8931
    • Malpractice RVU 0.27 changed to 0.26
    • Work GPCI 1.024 changed to 1.021
    • Practice expense GPCI 1.049 changed to 1.048
    • Malpractice GPCI 0.990 changed to 0.981

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $115.86changed to$117.15

    • Conversion factor 36.0391 changed to 36.0896
    • Practice expense RVU 0.76 changed to 0.78
    • Malpractice RVU 0.25 changed to 0.27
    • Work GPCI 1.027 changed to 1.024
    • Practice expense GPCI 1.050 changed to 1.049
    • Malpractice GPCI 0.999 changed to 0.990

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $116.47changed to$115.86

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 0.77 changed to 0.76
    • Malpractice RVU 0.26 changed to 0.25

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $114.95changed to$116.47

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 0.78 changed to 0.77
    • Malpractice RVU 0.25 changed to 0.26
    • Work GPCI 1.025 changed to 1.027
    • Practice expense GPCI 1.052 changed to 1.050
    • Malpractice GPCI 0.879 changed to 0.999

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $113.03changed to$114.95

    • Conversion factor 35.8043 changed to 35.8887
    • Practice expense RVU 0.77 changed to 0.78
    • Work GPCI 1.022 changed to 1.025
    • Practice expense GPCI 1.053 changed to 1.052
    • Malpractice GPCI 0.759 changed to 0.879

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $114.09changed to$113.03

    • Conversion factor 35.9335 changed to 35.8043
    • Practice expense RVU 0.78 changed to 0.77
    • Malpractice RVU 0.26 changed to 0.25

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $113.52changed to$114.09

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $222.85changed to$113.52

    • Conversion factor 35.8228 changed to 35.7547
    • Work RVU 2.34 changed to 2.11
    • Practice expense RVU 3.41 changed to 0.78
    • Malpractice RVU 0.25 changed to 0.26
    • Work GPCI 1.020 changed to 1.022
    • Malpractice GPCI 0.973 changed to 0.759

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    No ratechanged to$222.85

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: No rate

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$110.98$110.98RVU26D
2026-07-01$110.98$110.98RVU26C
2026-04-01$110.98$110.98RVU26B
2026-01-01$110.98$110.98RVU26A
2025-10-01$103.59$103.59RVU25D
2025-07-01$103.59$103.59RVU25C
2025-04-01$103.59$103.59RVU25B
2025-01-01$103.59$103.59RVU25A
2024-10-01$105.97$105.97RVU24D
2024-07-01$105.97$105.97RVU24C
2024-04-01$105.97$105.97RVU24B
2024-03-09$105.97$105.97RVU24AR
2024-01-01$104.24$104.24RVU24A
2023-10-01$108.45$108.45RVU23D
2023-07-01$108.45$108.45RVU23C
2023-04-01$108.45$108.45RVU23B
2023-01-01$108.45$108.45RVU23A
2022-10-01$111.33$111.33RVU22D
2022-07-01$111.33$111.33RVU22C
2022-04-01$111.33$111.33RVU22B
2022-01-01$111.33$111.33RVU22A
2021-10-01$112.59$112.59RVU21D
2021-07-01$112.59$112.59RVU21C
2021-04-01$112.59$112.59RVU21B
2021-01-01$112.59$112.59RVU21A
2020-10-01$117.15$117.15RVU20D
2020-07-01$117.15$117.15RVU20C
2020-04-01$117.15$117.15RVU20B
2020-01-01$117.15$117.15RVU20A
2019-10-01$115.86$115.86RVU19D
2019-07-01$115.86$115.86RVU19C
2019-04-01$115.86$115.86RVU19B
2019-01-01$115.86$115.86RVU19A
2018-10-01$116.47$116.47RVU18D
2018-07-01$116.47$116.47RVU18C
2018-04-01$116.47$116.47RVU18B
2018-01-01$116.47$116.47RVU18AR1
2017-10-01$114.95$114.95RVU17D
2017-07-01$114.95$114.95RVU17C
2017-04-01$114.95$114.95RVU17B
2017-01-01$114.95$114.95RVU17A
2016-10-01$113.03$113.03RVU16D
2016-07-01$113.03$113.03RVU16C
2016-04-01$113.03$113.03RVU16B
2016-01-01$113.03$113.03RVU16A
2015-10-01$114.09$114.09RVU15D
2015-07-01$114.09$114.09RVU15C
2015-04-01$113.52$113.52RVU15B
2015-01-01$113.52$113.52RVU15A
2014-10-01$222.85$126.66RVU14D
2014-07-01$222.85$126.66RVU14C
2014-04-01$222.85$126.66RVU14B
2014-01-01$222.85$126.66RVU14A
2013-10-01Rate data unavailableRate data unavailableRVU13D
2013-07-01Rate data unavailableRate data unavailableRVU13C
2013-04-01Rate data unavailableRate data unavailableRVU13B
2013-01-01Rate data unavailableRate data unavailableRVU13AR

Price 99183 for an earlier date of service

Where the Rhode Island rate applies

Rhode Island is a Medicare payment area, not a city. Our Census mapping connects it to 36 cities and communities in Rhode Island. Some span more than one payment area; confirm with the service ZIP.

  • Ashaway
  • Bradford
  • Carolina
  • Central Falls
  • Charlestown
  • Chepachet
  • Clayville
  • Cranston

Browse all communities in Rhode Island

99183 billing questions

Does 99183 include the hyperbaric chamber service?

No. CMS identifies 99183 as professional-component-only; the chamber’s technical service is reported separately, commonly with HCPCS G0277.

What should the physician document for 99183?

Document the treatment session, the patient’s condition and assessment, and the physician’s oversight and report for that session.

Is 99183 reported once per course of therapy or per session?

It represents a treatment session, so report it for each session when the physician provides and documents the professional service.

Should modifier 26 be appended to 99183?

CMS identifies 99183 itself as a professional-component-only code. Do not treat it as the technical chamber service.

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 99183PPRRVU2026_Oct_nonQPP.csv, line 13,001 (RVU26D)
Geographic factors for Rhode IslandGPCI2026.csv, line 92 (RVU26D)

Open CMS sourceHow we calculate rates

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