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HCPCS G0277 · Level II · G code

G0277: Hyperbaric oxygen under pressure, full body chamber, per 30 minute interval, HCPCS Level II G code

Compiled from CMS files by the QuickIntell RCM Editorial Team · Data effective · Method: reference methodology · Report a data correction

Data currency: HCPCS Level II file: October 2026 (effective October 1, 2026); PFS relative value file: RVU26D, released August 26, 2026 (effective October 1, 2026); NCCI MUE tables: 2026 Q4 (effective October 1, 2026); NCCI PTP edits: v323r0 (2026 Q4) (effective October 1, 2026); OPPS Addendum B: October 2026 (effective October 1, 2026). Next CMS release: January 1, 2027 (quarterly update) for the HCPCS Level II file and NCCI MUE tables and NCCI PTP edits and OPPS Addendum B; RVU27A with the CY2027 PFS final rule, effective January 1, 2027 for the PFS relative value file.

Key facts for G0277

Medicare payment
$193.73
PFS non-facility, national
Coverage code
D
special coverage instructions apply
Practitioner MUE
5
MAI 3
OPPS status
SI S
Procedure or service, not discounted when multiple
NCCI PTP pairs
3
practitioner file
LCDs and articles
0 / 0

TL;DR

CMS describes HCPCS G0277, added in 2015, as "Hyperbaric oxygen under pressure, full body chamber, per 30 minute interval". National PFS payment for G0277 is $193.73 in an office and no facility amount in a facility (October 2026), built from 0.00 work, 5.76 practice-expense and 0.04 malpractice RVUs at $33.4009 per RVU. Qualifying APM participants get $194.69 at $33.5675. CMS caps G0277 at practitioner 5 (MAI 3, Clinical: Data); hospital outpatient 5 (MAI 3, Clinical: Data) units per day in the 2026 Q4 MUE tables. In the NCCI PTP files v323r0 G0277 appears in 0 practitioner pairs as column 2 and 3 as column 1. G0277 appears in no active LCD or billing and coding article, so coverage follows HCPCS coverage code D (special coverage instructions apply) and any NCD. HCPCS record: BETOS P5E (ambulatory procedures - other); pricing indicator 13; type of service 1 (medical care). Nearby codes: G0278, G0279, G0281, G0282.

G0277 descriptor and code status

The October 2026 HCPCS Level II file describes G0277 as “Hyperbaric oxygen under pressure, full body chamber, per 30 minute interval”. It sits in the G section (procedures and professional services, temporary), listed with the other G codes. Although searches often call it the "G0277 CPT code", G0277 is a HCPCS Level II code maintained by CMS, not an AMA CPT code; both go in the same procedure-code field on the claim.

HCPCS file attributes of G0277
FieldValue
Short descriptorHbot, full body chamber, 30m
Added to HCPCS2015-01-01
Last actionN (no maintenance), effective 2015-01-01
Coverage codeD: special coverage instructions apply
Pricing indicator13: physician fee schedule, priced by the contractor
BETOS categoryP5E: ambulatory procedures - other
Type of service1: medical care

Medicare payment for G0277

National PFS payment for G0277 is $193.73 in an office and no facility amount in a facility (October 2026), built from 0.00 work, 5.76 practice-expense and 0.04 malpractice RVUs at $33.4009 per RVU. Qualifying APM participants get $194.69 at $33.5675. The amounts below are national figures from the October 2026 CMS files; the contractor applies the locality, rural or state adjustment and the beneficiary's cost sharing.

Physician fee schedule (RVU26D)

Status A: active: paid separately under the physician fee schedule when covered. Global period XXX (global surgery concept does not apply); PC/TC indicator 3 (technical component only).

PFS relative values and national payment for G0277
ComponentNon-facilityFacility
Work RVU0.000.00
Practice expense RVU5.76NA
Malpractice RVU0.040.04
Total RVUs5.80NA
National payment (CF $33.4009)$193.73n/a
Qualifying APM participant (CF $33.5675)$194.69n/a
  • Multiple procedures (modifier 51): no multiple-procedure reduction
  • Bilateral (modifier 50): 150% bilateral adjustment does not apply
  • Assistant at surgery: assistant at surgery paid only with documentation; co-surgeons: co-surgeons not permitted; team surgery: team surgeons not permitted
  • Physician supervision of diagnostic procedures: supervision concept does not apply

Hospital outpatient (OPPS Addendum B)

Status indicator S (Procedure or service, not discounted when multiple), APC 5061 (Hyperbaric Oxygen), national unadjusted payment $140.59 with a minimum unadjusted copayment of $28.12.

Medically Unlikely Edits for G0277

CMS caps G0277 at practitioner 5 (MAI 3, Clinical: Data); hospital outpatient 5 (MAI 3, Clinical: Data) units per day in the 2026 Q4 MUE tables. The practitioner MUE is a date-of-service clinical edit: units above the limit deny but can be paid on appeal with documentation.

MUE values for G0277 by setting
SettingMUE (units/DOS)MAICMS rationale
Practitioner services53 Date of Service Edit: ClinicalClinical: Data
Facility outpatient hospital53 Date of Service Edit: ClinicalClinical: Data

The MUE lookup for G0277 shows every setting next to any other code on the same claim.

NCCI edits and add-on rules

In the practitioner PTP file v323r0, G0277 is the column-2 (bundled) code in 0 active pairs and the column-1 code in 3 (0% modifier-allowed); 0 earlier pairs have been deleted.

Column-2 codes bundled into G0277 (practitioner)
Column-2 codePairs
36591 (CPT; descriptor licensed by AMA)1
36592 (CPT; descriptor licensed by AMA)1
96523 (CPT; descriptor licensed by AMA)1

G0277 is neither an add-on code nor a designated primary code in the 2026 Q4 NCCI add-on edit file.

Pair counts show exposure, not the answer for one claim. Check G0277 against a second code to see whether the pair bundles and whether a modifier can separate the services.

Medicare coverage policies for G0277

No current LCD or billing and coding article lists G0277. The HCPCS coverage code D means special coverage instructions apply, and any National Coverage Determination for the service still applies.

Denials to expect on G0277

CARC 50 · N115

the service is not reasonable and necessary for the diagnosis on the claim

CARC 151 · N362

units of G0277 exceed the practitioner MUE of 5 per date of service

CARC 4

the modifier reported is inconsistent with the code

CARC 16

the claim lacks the description, invoice or pricing detail a contractor-priced code needs

Where QuickIntell fits for G0277 claims

QuickCode supports qualified coder review of units, modifiers and NCCI pairs for G0277 before the claim leaves, and QuickRCM carries claim readiness and the denial follow-up when an edit or coverage policy is missed.

See QuickCode for coder reviewSee QuickRCM for denial follow-upBook a meeting

Frequently asked questions: HCPCS G0277

What does HCPCS code G0277 describe?

"Hyperbaric oxygen under pressure, full body chamber, per 30 minute interval" (short descriptor "Hbot, full body chamber, 30m"), in the G section (procedures and professional services, temporary). Added 2015-01-01.

Is G0277 a CPT code?

It is not. G0277 belongs to the G section (procedures and professional services, temporary) of HCPCS Level II, the CMS code set, not to AMA CPT. "G0277 CPT code" searches refer to it.

What does Medicare pay for G0277?

National PFS payment for G0277 is $193.73 in an office and no facility amount in a facility (October 2026), built from 0.00 work, 5.76 practice-expense and 0.04 malpractice RVUs at $33.4009 per RVU. Qualifying APM participants get $194.69 at $33.5675.

How many units of G0277 can be billed per day?

CMS caps G0277 at practitioner 5 (MAI 3, Clinical: Data); hospital outpatient 5 (MAI 3, Clinical: Data) units per day in the 2026 Q4 MUE tables. For the practitioner MUE (MAI 3), units above 5 deny for the day but can be paid on appeal with documentation; denials arrive as CARC 151.

Does Medicare cover G0277?

G0277 appears in no active LCD or billing and coding article, so coverage follows HCPCS coverage code D (special coverage instructions apply) and any NCD.

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Disclaimer

This page is an operational reference compiled from CMS publications: the HCPCS Level II file, the physician, DMEPOS and clinical laboratory fee schedules, OPPS and ASC addenda, NCCI MUE, PTP and add-on edit tables and the Medicare Coverage Database. Amounts are Medicare national figures before locality and state adjustment; Medicaid and commercial payers set their own. CPT codes are shown as numbers only; CPT descriptors are copyright AMA. Nothing here is legal, clinical or billing advice.

Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.