CPT code 78635: CSF imaging, ventricular flow study2026 Medicare rate & RVUs in South Dakota

In South Dakota, Medicare pays $292.82 for 78635 in the office.

Check a contract rate as a % of Medicare · 78635 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 78635 covers

This nuclear medicine study follows radiotracer distribution through cerebrospinal fluid in the ventricular system. It is used when clinicians need information about ventricular CSF flow, such as in evaluating a suspected flow abnormality. A nuclear medicine physician interprets the images; the study may involve ventricular access for tracer administration, with imaging performed in a nuclear medicine department.

Report 78635 for the ventricular CSF imaging service, rather than a general brain scan or a study focused on shunt function or CSF leakage. The record should support the clinical question, tracer administration and access route, images obtained, and the physician’s interpretation. CMS recognizes a professional component, reported with modifier 26 for interpretation, and a technical component, reported with modifier TC for equipment and staff. Without either modifier, the claim represents the global 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 South Dakota compares for 78635

Across 109 of 109 payment localities, the office rate for 78635 runs from $254.92 in Arkansas to $415.84 in San Benito County, CA. South Dakota pays $292.82. The RVUs are the same everywhere; the geographic indexes change the dollars.

Every other payment area

78635 rates by state

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

See 78635 in every payment locality

How the 78635 rate is calculated

Each of 78635’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 78635

The CMS indicators that decide how 78635 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

Codes related to 78635

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

How 78635 has changed in South Dakota

Price 78635 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