CPT code 99183: Hyperbaric oxygen, professional service2026 Medicare rate & RVUs in Riverside, CA

In Riverside, CA, Medicare pays $112.60 for 99183 in the office and $112.60 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.

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 Riverside, CA 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. Riverside, CA pays $112.60. The RVUs are the same everywhere; the geographic indexes change the dollars.

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99183 rates by state

Office rate range in each state. Select a state to see its payment localities.

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.

Payment rules and modifiers for 99183

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

Codes related to 99183

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

How 99183 has changed in Riverside, CA

Price 99183 for an earlier date of service

Where the Riverside, CA rate applies

Riverside, CA is a Medicare payment area, not a city. Our Census mapping connects it to 127 cities and communities in California. Some span more than one payment area; confirm with the service ZIP.

• Ontario
• Riverside
• San Bernardino
• Adelanto
• Aguanga
• Anza
• Apple Valley
• Baker

Browse all communities in California

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

Open CMS sourceHow we calculate rates