CPT code 91030: Acid challenge, provocative esophageal acid test2026 Medicare rate & RVUs in South Dakota

In South Dakota, Medicare pays $161.55 for 91030 in the office.

Check a contract rate as a % of Medicare · 91030 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 91030 covers

This test introduces acid into the esophagus through a catheter while the clinician observes whether the patient’s characteristic symptoms are reproduced. It may be used in evaluating noncardiac chest pain or suspected acid-related esophageal symptoms. A gastroenterologist or another clinician experienced in esophageal testing typically performs the procedure; trained staff may assist with the test, and a physician interprets the findings.

Report 91030 when the service is an esophageal acid perfusion challenge, rather than pressure measurement or monitoring of naturally occurring reflux. Documentation should support the clinical indication, the acid challenge performed, the patient’s symptom response, and the interpretation. The code has a 0-day global period, so same-day preoperative and postoperative care is included. Bill the global service without a component modifier, or report modifier 26 for interpretation or TC for equipment and staff. Modifier 50 is inappropriate for this single-organ test. Assistant-at-surgery payment requires documented medical necessity; co-surgeons and team surgery are not permitted.

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 South Dakota compares for 91030

Across 109 of 109 payment localities, the office rate for 91030 runs from $143.34 in Arkansas to $223.18 in San Benito County, CA. South Dakota pays $161.55. The RVUs are the same everywhere; the geographic indexes change the dollars.

Every other payment area

91030 rates by state

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

See 91030 in every payment locality

How the 91030 rate is calculated

Each of 91030’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 91030

The CMS indicators that decide how 91030 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

Codes related to 91030

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

How 91030 has changed in South Dakota

Price 91030 for an earlier date of service

Where the South Dakota rate applies

South Dakota is a Medicare payment area, not a city. Our Census mapping connects it to 485 cities and communities in South Dakota. Some span more than one payment area; confirm with the service ZIP.

• Aberdeen
• Agar
• Agency Village
• Akaska
• Albee
• Alcester
• Alexandria
• Allen

Browse all communities in South Dakota

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