HCPCS code A9548: Indium-111 pentetate, per 0.5 mCi2026 Medicare rate & RVUs in Missouri

CMS doesn’t publish an office rate for A9548 in Missouri.

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What A9548 covers

Indium-111 pentetate is a diagnostic radiopharmaceutical used in radionuclide cisternography and other cerebrospinal fluid studies, including investigation of suspected CSF leakage or altered flow. Nuclear medicine professionals use it as an imaging agent, typically administered intrathecally for these studies. A9548 identifies the radiopharmaceutical rather than the imaging procedure; CPT 78630 identifies cisternography.

A9548 is a HCPCS Level II code with physician fee schedule status C: CMS publishes no national payment, and the Medicare Administrative Contractor sets payment for each claim. In the HCPCS pricing file, its pricing method is payment set by statute; coverage is left to the Medicare contractor’s judgment. Each unit represents 0.5 millicurie of indium In-111 pentetate, so 1.0 millicurie corresponds to 2 units.

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 A9548 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.

How the A9548 rate is calculated

Each of A9548’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 A9548

A9548 has no global surgery period, no multiple-procedure, bilateral or assistant-at-surgery adjustment, and no professional/technical split. What changes the payment is where the service happens: the place of service on the claim decides whether Medicare pays the office or the facility rate.

A9548 compared with similar codes

How to choose

A9539Tc-99m pentetatePer study dose

A9539 identifies technetium Tc-99m pentetate, while A9548 identifies indium In-111 pentetate. The radiopharmaceutical used determines the code.

A9547Indium-111 oxyquinolinePer 0.5 mCi

A9547 identifies indium In-111 oxyquinoline, used for cell labeling. A9548 identifies indium In-111 pentetate for diagnostic studies.

78630CSF scanCisternography

CPT 78630 identifies the cisternography imaging service; A9548 identifies the indium In-111 pentetate radiopharmaceutical.

Codes related to A9548

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

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