CPT code 99183: Hyperbaric oxygen, professional service2026 Medicare rate & RVUs in Connecticut
Reports the physician’s professional service for a hyperbaric oxygen treatment session, separately from the technical service for chamber treatment.
In Connecticut, Medicare pays $115.22 for 99183 in the office and $115.22 when it’s performed in a hospital or facility.
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.
On this page 11 sections
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 Connecticut 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. Connecticut pays $115.22. The RVUs are the same everywhere; the geographic indexes change the dollars.
- Connecticut · this page$115.22
- Los Angeles, CA · California$115.33+$0.11
- Washington, DC area · District of Columbia$119.96+$4.74
- Miami, FL · Florida$124.15+$8.93
- Chicago, IL · Illinois$121.44+$6.22
- Manhattan, NY · New York$124.24+$9.02
- Alaska · Alaska$142.14+$26.92
Other areas in Connecticut first, then benchmark localities. Bars start at $0.
Every other payment area
| Payment locality | Office | Facility |
|---|---|---|
| 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 |
| Madera, CACalifornia | $109.77 | $109.77 |
| Merced, CACalifornia | $109.77 | $109.77 |
| Modesto, CACalifornia | $109.77 | $109.77 |
| Napa, CACalifornia | $119.81 | $119.81 |
| Oxnard, CACalifornia | $114.04 | $114.04 |
| Redding, CACalifornia | $109.77 | $109.77 |
| Rest of CaliforniaCalifornia | $109.77 | $109.77 |
| Riverside, CACalifornia | $112.60 | $112.60 |
| Sacramento, CACalifornia | $113.23 | $113.23 |
| Salinas, CACalifornia | $112.76 | $112.76 |
| San Diego, CACalifornia | $113.93 | $113.93 |
| Marin County, CACalifornia | $124.54 | $124.54 |
| San Francisco, CACalifornia | $124.24 | $124.24 |
| San Benito County, CACalifornia | $127.27 | $127.27 |
| Santa Clara County, CACalifornia | $126.06 | $126.06 |
| San Luis Obispo, CACalifornia | $111.15 | $111.15 |
| Santa Cruz, CACalifornia | $113.86 | $113.86 |
| Santa Maria, CACalifornia | $112.77 | $112.77 |
| Santa Rosa, CACalifornia | $114.90 | $114.90 |
| Stockton, CACalifornia | $109.77 | $109.77 |
| Vallejo, CACalifornia | $119.39 | $119.39 |
| Visalia, CACalifornia | $109.77 | $109.77 |
| Yuba City, CACalifornia | $109.77 | $109.77 |
| ColoradoColorado | $110.53 | $110.53 |
| DelawareDelaware | $108.64 | $108.64 |
| Fort Lauderdale, FLFlorida | $116.99 | $116.99 |
| Rest of FloridaFlorida | $112.51 | $112.51 |
| Atlanta, GAGeorgia | $112.02 | $112.02 |
| Rest of GeorgiaGeorgia | $107.76 | $107.76 |
| Hawaii, Guam, HIHawaii | $110.29 | $110.29 |
| IowaIowa | $101.59 | $101.59 |
| IdahoIdaho | $102.41 | $102.41 |
| East St. Louis, ILIllinois | $115.80 | $115.80 |
| Rest of IllinoisIllinois | $111.65 | $111.65 |
| Suburban Chicago, ILIllinois | $117.61 | $117.61 |
| IndianaIndiana | $102.75 | $102.75 |
| KansasKansas | $102.17 | $102.17 |
| KentuckyKentucky | $105.26 | $105.26 |
| New Orleans, LALouisiana | $108.84 | $108.84 |
| Rest of LouisianaLouisiana | $105.50 | $105.50 |
| Metropolitan Boston, MAMassachusetts | $117.64 | $117.64 |
| Rest of MassachusettsMassachusetts | $110.59 | $110.59 |
| Baltimore area, MDMaryland | $115.05 | $115.05 |
| Rest of MarylandMaryland | $109.92 | $109.92 |
| Rest of MaineMaine | $103.71 | $103.71 |
| Southern Maine, MEMaine | $106.06 | $106.06 |
| Detroit, MIMichigan | $114.39 | $114.39 |
| Rest of MichiganMichigan | $107.89 | $107.89 |
| MinnesotaMinnesota | $104.37 | $104.37 |
| Metropolitan Kansas City, MOMissouri | $107.40 | $107.40 |
| Metropolitan St. Louis, MOMissouri | $108.03 | $108.03 |
| Rest of MissouriMissouri | $104.90 | $104.90 |
| MississippiMississippi | $102.83 | $102.83 |
| MontanaMontana | $109.54 | $109.54 |
| North CarolinaNorth Carolina | $104.27 | $104.27 |
| North DakotaNorth Dakota | $104.40 | $104.40 |
| NebraskaNebraska | $101.68 | $101.68 |
| New HampshireNew Hampshire | $109.78 | $109.78 |
| Northern New JerseyNew Jersey | $119.61 | $119.61 |
| Rest of New JerseyNew Jersey | $116.10 | $116.10 |
| New MexicoNew Mexico | $108.64 | $108.64 |
| NevadaNevada | $108.14 | $108.14 |
| NYC suburbs and Long Island, NYNew York | $127.46 | $127.46 |
| Poughkeepsie and northern NYC suburbs, NYNew York | $117.52 | $117.52 |
| Queens, NYNew York | $123.63 | $123.63 |
| Rest of New YorkNew York | $105.37 | $105.37 |
| OhioOhio | $106.83 | $106.83 |
| OklahomaOklahoma | $104.19 | $104.19 |
| Portland, OROregon | $111.99 | $111.99 |
| Rest of OregonOregon | $106.85 | $106.85 |
| Metropolitan Philadelphia, PAPennsylvania | $113.78 | $113.78 |
| Rest of PennsylvaniaPennsylvania | $106.45 | $106.45 |
| Puerto RicoPuerto Rico | $109.78 | $109.78 |
| Rhode IslandRhode Island | $110.98 | $110.98 |
| South CarolinaSouth Carolina | $105.82 | $105.82 |
| South DakotaSouth Dakota | $103.79 | $103.79 |
| TennesseeTennessee | $102.62 | $102.62 |
| Austin, TXTexas | $110.56 | $110.56 |
| Beaumont, TXTexas | $106.05 | $106.05 |
| Brazoria, TXTexas | $107.91 | $107.91 |
| Dallas, TXTexas | $108.81 | $108.81 |
| Fort Worth, TXTexas | $108.61 | $108.61 |
| Galveston, TXTexas | $108.39 | $108.39 |
| Houston, TXTexas | $113.15 | $113.15 |
| Rest of TexasTexas | $107.08 | $107.08 |
| UtahUtah | $106.75 | $106.75 |
| VirginiaVirginia | $106.46 | $106.46 |
| Virgin Islands, VIUnited States Virgin Islands | $109.78 | $109.78 |
| VermontVermont | $104.94 | $104.94 |
| Rest of WashingtonWashington | $110.07 | $110.07 |
| King County, WAWashington | $118.68 | $118.68 |
| WisconsinWisconsin | $102.20 | $102.20 |
| West VirginiaWest Virginia | $109.10 | $109.10 |
| WyomingWyoming | $107.30 | $107.30 |
99183 rates by state
Office rate range in each state. Select a state to see its payment localities.
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
| State / territory | Office rate range | Localities |
|---|---|---|
| AK | $142.14 | 1 |
| AL | $101.78 | 1 |
| AR | $100.82 | 1 |
| AZ | $107.31 | 1 |
| CA | $109.77–$127.27 | 29 |
| CO | $110.53 | 1 |
| CT | $115.22 | 1 |
| DC | $119.96 | 1 |
| DE | $108.64 | 1 |
| FL | $112.51–$124.15 | 3 |
| GA | $107.76–$112.02 | 2 |
| GU | $110.29 | 1 |
| HI | $110.29 | 1 |
| IA | $101.59 | 1 |
| ID | $102.41 | 1 |
| IL | $111.65–$121.44 | 4 |
| IN | $102.75 | 1 |
| KS | $102.17 | 1 |
| KY | $105.26 | 1 |
| LA | $105.50–$108.84 | 2 |
| MA | $110.59–$117.64 | 2 |
| MD | $109.92–$119.96 | 3 |
| ME | $103.71–$106.06 | 2 |
| MI | $107.89–$114.39 | 2 |
| MN | $104.37 | 1 |
| MO | $104.90–$108.03 | 3 |
| MS | $102.83 | 1 |
| MT | $109.54 | 1 |
| NC | $104.27 | 1 |
| ND | $104.40 | 1 |
| NE | $101.68 | 1 |
| NH | $109.78 | 1 |
| NJ | $116.10–$119.61 | 2 |
| NM | $108.64 | 1 |
| NV | $108.14 | 1 |
| NY | $105.37–$127.46 | 5 |
| OH | $106.83 | 1 |
| OK | $104.19 | 1 |
| OR | $106.85–$111.99 | 2 |
| PA | $106.45–$113.78 | 2 |
| PR | $109.78 | 1 |
| RI | $110.98 | 1 |
| SC | $105.82 | 1 |
| SD | $103.79 | 1 |
| TN | $102.62 | 1 |
| TX | $106.05–$113.15 | 8 |
| UT | $106.75 | 1 |
| VA | $106.46–$119.96 | 2 |
| VI | $109.78 | 1 |
| VT | $104.94 | 1 |
| WA | $110.07–$118.68 | 2 |
| WI | $102.20 | 1 |
| WV | $109.10 | 1 |
| WY | $107.30 | 1 |
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
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 Connecticut 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
38
- Locality
- Connecticut
- Physician work
- 1.020
- Practice expense
- 1.077
- Malpractice
- 1.210
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 2.06 | × 1.020 | 2.1012 |
| Practice expense | 0.96 | × 1.077 | 1.0339 |
| Malpractice | 0.26 | × 1.210 | 0.3146 |
| Total RVUs | 3.4497 | ||
| Conversion factor | × 33.4009 | ||
Office rate, Connecticut$115.22
Office: (2.06 × 1.02 + 0.96 × 1.077 + 0.26 × 1.21) × $33.4009 = $115.22
Facility: (2.06 × 1.02 + 0.96 × 1.077 + 0.26 × 1.21) × $33.4009 = $115.22
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
| Rule | CMS value | What it means |
|---|---|---|
| Global period | XXX | The global surgery concept doesn’t apply. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 2 | Professional component only. |
How 99183 has changed in Connecticut
99183 · Office / nonfacility
$115.22
Effective 2026-10-01
The base rate is $7.40 higher than on 2025-10-01, moving from $107.82 to $115.22 (6.9%).
It is unchanged from the immediately preceding available release, effective 2026-07-01.
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
January 1, 2026
RVU26A
$107.82changed to$115.22
- 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 1.022 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.
January 1, 2025
RVU25A
$110.19changed to$107.82
- 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.
March 9, 2024
RVU24AR
$108.39changed to$110.19
- Conversion factor 32.7442 changed to 33.2875
Held through RVU24B, RVU24C, RVU24D.
January 1, 2024
RVU24A
$111.83changed to$108.39
- Conversion factor 33.8872 changed to 32.7442
- 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
January 1, 2023
RVU23A
$113.87changed to$111.83
- 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 1.037 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.
January 1, 2022
RVU22A
$115.14changed to$113.87
- Conversion factor 34.8931 changed to 34.6062
- Malpractice RVU 0.26 changed to 0.25
Held through RVU22B, RVU22C, RVU22D.
January 1, 2021
RVU21A
$120.35changed to$115.14
- Conversion factor 36.0896 changed to 34.8931
- Malpractice RVU 0.27 changed to 0.26
- 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.
January 1, 2020
RVU20A
$119.40changed to$120.35
- 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 1.021 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.
January 1, 2019
RVU19A
$120.13changed to$119.40
- 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.
January 1, 2018
RVU18AR1
$119.90changed to$120.13
- 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 1.023 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.
January 1, 2017
RVU17A
$119.29changed to$119.90
- Conversion factor 35.8043 changed to 35.8887
- Practice expense RVU 0.77 changed to 0.78
- 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.
January 1, 2016
RVU16A
$120.57changed to$119.29
- 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.
July 1, 2015
RVU15C
$119.97changed to$120.57
- Conversion factor 35.7547 changed to 35.9335
Held through RVU15D.
January 1, 2015
RVU15A
$233.21changed to$119.97
- 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
- Practice expense GPCI 1.116 changed to 1.121
- Malpractice GPCI 1.234 changed to 1.232
Held through RVU15B.
January 1, 2014
RVU14A
$236.34changed to$233.21
- Conversion factor 34.0230 changed to 35.8228
- Practice expense RVU 3.81 changed to 3.41
- Malpractice RVU 0.26 changed to 0.25
- Practice expense GPCI 1.110 changed to 1.116
- Malpractice GPCI 1.235 changed to 1.234
Held through RVU14B, RVU14C, RVU14D.
January 1, 2013
RVU13AR
Earliest loaded release: $236.34
Held through RVU13B, RVU13C, RVU13D.
| Effective from | Office | Facility | CMS release |
|---|---|---|---|
| 2026-10-01 | $115.22 | $115.22 | RVU26D |
| 2026-07-01 | $115.22 | $115.22 | RVU26C |
| 2026-04-01 | $115.22 | $115.22 | RVU26B |
| 2026-01-01 | $115.22 | $115.22 | RVU26A |
| 2025-10-01 | $107.82 | $107.82 | RVU25D |
| 2025-07-01 | $107.82 | $107.82 | RVU25C |
| 2025-04-01 | $107.82 | $107.82 | RVU25B |
| 2025-01-01 | $107.82 | $107.82 | RVU25A |
| 2024-10-01 | $110.19 | $110.19 | RVU24D |
| 2024-07-01 | $110.19 | $110.19 | RVU24C |
| 2024-04-01 | $110.19 | $110.19 | RVU24B |
| 2024-03-09 | $110.19 | $110.19 | RVU24AR |
| 2024-01-01 | $108.39 | $108.39 | RVU24A |
| 2023-10-01 | $111.83 | $111.83 | RVU23D |
| 2023-07-01 | $111.83 | $111.83 | RVU23C |
| 2023-04-01 | $111.83 | $111.83 | RVU23B |
| 2023-01-01 | $111.83 | $111.83 | RVU23A |
| 2022-10-01 | $113.87 | $113.87 | RVU22D |
| 2022-07-01 | $113.87 | $113.87 | RVU22C |
| 2022-04-01 | $113.87 | $113.87 | RVU22B |
| 2022-01-01 | $113.87 | $113.87 | RVU22A |
| 2021-10-01 | $115.14 | $115.14 | RVU21D |
| 2021-07-01 | $115.14 | $115.14 | RVU21C |
| 2021-04-01 | $115.14 | $115.14 | RVU21B |
| 2021-01-01 | $115.14 | $115.14 | RVU21A |
| 2020-10-01 | $120.35 | $120.35 | RVU20D |
| 2020-07-01 | $120.35 | $120.35 | RVU20C |
| 2020-04-01 | $120.35 | $120.35 | RVU20B |
| 2020-01-01 | $120.35 | $120.35 | RVU20A |
| 2019-10-01 | $119.40 | $119.40 | RVU19D |
| 2019-07-01 | $119.40 | $119.40 | RVU19C |
| 2019-04-01 | $119.40 | $119.40 | RVU19B |
| 2019-01-01 | $119.40 | $119.40 | RVU19A |
| 2018-10-01 | $120.13 | $120.13 | RVU18D |
| 2018-07-01 | $120.13 | $120.13 | RVU18C |
| 2018-04-01 | $120.13 | $120.13 | RVU18B |
| 2018-01-01 | $120.13 | $120.13 | RVU18AR1 |
| 2017-10-01 | $119.90 | $119.90 | RVU17D |
| 2017-07-01 | $119.90 | $119.90 | RVU17C |
| 2017-04-01 | $119.90 | $119.90 | RVU17B |
| 2017-01-01 | $119.90 | $119.90 | RVU17A |
| 2016-10-01 | $119.29 | $119.29 | RVU16D |
| 2016-07-01 | $119.29 | $119.29 | RVU16C |
| 2016-04-01 | $119.29 | $119.29 | RVU16B |
| 2016-01-01 | $119.29 | $119.29 | RVU16A |
| 2015-10-01 | $120.57 | $120.57 | RVU15D |
| 2015-07-01 | $120.57 | $120.57 | RVU15C |
| 2015-04-01 | $119.97 | $119.97 | RVU15B |
| 2015-01-01 | $119.97 | $119.97 | RVU15A |
| 2014-10-01 | $233.21 | $131.27 | RVU14D |
| 2014-07-01 | $233.21 | $131.27 | RVU14C |
| 2014-04-01 | $233.21 | $131.27 | RVU14B |
| 2014-01-01 | $233.21 | $131.27 | RVU14A |
| 2013-10-01 | $236.34 | $127.19 | RVU13D |
| 2013-07-01 | $236.34 | $127.19 | RVU13C |
| 2013-04-01 | $236.34 | $127.19 | RVU13B |
| 2013-01-01 | $236.34 | $127.19 | RVU13AR |
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
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
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