HCPCS code G0277: Hyperbaric oxygen, full-body chamber, per 30 minutes2026 Medicare rate & RVUs in Missouri
Reports each 30-minute unit of therapeutic oxygen delivered under pressure in a full-body chamber for a medically indicated treatment session.
Medicare pays $167.14–$184.49 for G0277 in the office in Missouri, from Rest of Missouri to Metropolitan St. Louis, MO. Which amount applies depends on the service address.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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What G0277 covers
G0277 reports the technical service of delivering hyperbaric oxygen in a pressurized, full-body chamber. A patient breathes oxygen while enclosed in the chamber, commonly at a hospital outpatient department or a specialized wound-care or hyperbaric center. Treatment may be part of care for selected conditions such as diabetic lower-extremity wounds or delayed radiation tissue injury. The chamber service is distinct from the physician’s attendance and supervision of the session.
Report units based on the documented treatment time, with each unit representing 30 minutes. The record should support the medical need for hyperbaric treatment, the full-body chamber service, and the time treated. CMS classifies G0277 as technical-component-only: physician interpretation is separately coded rather than included in this service. The CMS fee schedule assigns practice expense and malpractice RVUs, with no physician-work RVUs, consistent with the technical nature of the code.
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.
Where G0277 pays more and less in Missouri
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
3 payment localities
$167.14 to $184.49
| Payment locality | Office | Facility |
|---|---|---|
| Metropolitan Kansas City, MO | $181.96 | Unavailable |
| Metropolitan St. Louis, MO | $184.49 | Unavailable |
| Rest of Missouri | $167.14 | Unavailable |
How the G0277 rate is calculated
Each of G0277’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 · G0277
RVUs × geographic indexes × conversion factor
Work0.00
0.00 RVUs× 1.000 GPCI
Practice expense5.76
5.76 RVUs× 1.000 GPCI
Malpractice0.04
0.04 RVUs× 1.000 GPCI
Adjusted RVUs
5.8000
Conversion factor
$33.4009
Medicare rate
$193.73
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for G0277
The CMS indicators that decide how G0277 is paid alongside other services.
CMS payment indicators · G0277
Hyperbaric oxygen, full-body chamber, per 30 minutes
| 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 | 3 | Technical component only. |
G0277 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 99183Hyperbaric oxygenProfessional service
- 99183 reports the physician’s attendance and supervision per session; G0277 reports the technical full-body chamber treatment in 30-minute units.
- A4575Oxygen chamberDisposable topical
- A4575 describes a disposable topical hyperbaric chamber. G0277 is for oxygen treatment delivered in a full-body chamber.
- 97597Selective wound debridementFirst 20 sq cm or less
- 97597 reports selective wound debridement by area and tissue depth; it does not represent hyperbaric chamber treatment.
G0277 billing questions
Does G0277 include the physician’s attendance and supervision?
No. G0277 reports the chamber treatment; CPT 99183 describes physician attendance and supervision of hyperbaric oxygen therapy per session.
How many units should be reported?
Report one unit for each documented 30-minute treatment interval. The record should substantiate the treatment time billed.
Does G0277 include a professional component?
No. CMS identifies G0277 as technical-component-only, with physician interpretation reported separately.
Can wound debridement be reported on the same date?
A distinct debridement service may be reported when it is performed and separately documented. G0277 represents chamber treatment, not wound debridement.
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
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