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ROBERT CHARLES TANNER ZAAS
NPI 1235715822
Radiology - Diagnostic Radiology in Madison, WI

Active since March 23, 2021PECOS EnrolledAccepts Medicare Assignment
600 HIGHLAND AVE, MADISON, WI 53792(608) 263-0899(608) 263-0876 Get Directions Write a Review

NPPES record last updated: July 1, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Robert Charles Tanner Zaas NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ROBERT CHARLES TANNER ZAAS (NPI 1235715822) is an individual diagnostic radiology provider in Madison, Wisconsin, licensed in Wisconsin (87106-20) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS, is affiliated with University Of Wi Hospitals & Clinics Authority, and maintains a secondary practice location in Columbus.

NPPES Registry Identity

NPI1235715822
Entity TypeIndividualMale
Primary Taxonomy2085R0202X
Provider Legal NameROBERT CHARLES TANNER ZAAS
Location Address600 HIGHLAND AVEMadison, WI 53792-0001
Mailing Address7974 Uw Health CtMiddleton, WI 53562-5531
Phone(608) 263-0899
Fax(608) 263-0876
Sole ProprietorNo
Medical School CMSOtherGraduated 2021
Enumeration DateMarch 23, 2021
Last NPPES UpdateJuly 1, 2026
NPPES CertifiedJuly 1, 2026
✔ NPI 1235715822 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0202X
License✔ Licensed in WI · 87106-20
Definition
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
600 HIGHLAND AVE, Madison, WI 53792
Open in Google Maps ↗

Secondary Practice Location 1

Location 1395 W 12th Ave Rm 414Columbus, OH 43210-1267 · Phone (614) 366-0768 · Fax (614) 293-6935

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Group Health Cooperative-SCW.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Robert Charles Tanner Zaas is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3971902511
PECOS Enrollment IDI20260708003300
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Robert Zaas reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

University Of Wisconsin System Non Payroll
0.1 mi
Multi-Specialty
750 HIGHLAND AVE FL 4, HEALTH SCIENCES LEARNING CENTER
Madison, WI 53705
  • Reassigned Medicare billing, Wisconsin enrollment
  • 206 clinicians in this Medicare group
NPI 1346266319 (608) 263-4938
Group Health Cooperative Of South Central Wisconsin
4.5 mi
Health Maintenance Organization
1265 JOHN Q HAMMONS DR
Madison, WI 53717
  • Reassigned Medicare billing, Wisconsin enrollment
  • 422 clinicians in this Medicare group
NPI 1245260165 (608) 251-4156
University Of Wisconsin Medical Foundation, Inc
5.0 mi
Multi-Specialty
7974 UW HEALTH COURT
Middleton, WI 53562
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,832 clinicians in this Medicare group
NPI 1598784555 (608) 829-5485

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

University Of Wi Hospitals & Clinics Authority

Acute Care Hospitals · Madison, WI
4/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number520098
Location600 Highland AvenueMadison, WI 53792 · Dane County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 53792 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$82.92 typical visit price
range $53.90 – $163.24
Typical copayment $20.73 (range $13.47 – $40.81)
Most-billed visit code 99203
Established Patient
$67.37 typical visit price
range $17.40 – $133.76
Typical copayment $16.84 (range $4.35 – $33.44)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JASON ALAN CHRISTENSEN PHARMD
Pharmacist
600 HIGHLAND AVE, COMPLIANCE MAIL CODE 2433
MADISON, WI 53792
Dane County (608) 662-0817
LAURA JEAN KOPPLIN MD, PHD
Ophthalmology
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-6070
HAGGI MAZEH MD
Surgery
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 265-8072
DR. SWAPNIL SUNIL LANJEWAR M.D.
Internal Medicine (Infectious Disease)
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-0946
DR. MATTHEW JAMES HOYT M.D.
Anesthesiology
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-8100
VANESSA MERCEDES WELTEN MD MPH
Transplant Surgery
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (617) 732-5500
JOHN HENRY NORMAN HARRISON
Anesthesiology
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-8100
PIPPA FROUKTE COSPER MD
Radiology (Radiation Oncology)
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-8500

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Robert Zaas's NPI number?

The NPI number for Robert Zaas is 1235715822. It was assigned to this individual provider in the NPPES registry on March 23, 2021.

Where is Robert Zaas located?

Robert Zaas practices at 600 Highland Ave, Madison, WI 53792. The listed phone number is (608) 263-0899.

What is Robert Zaas's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is Robert Zaas enrolled in Medicare?

Yes. Robert Zaas is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Robert Zaas's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Robert Zaas reassigns Medicare benefits to 3 organizations: University Of Wisconsin System Non Payroll (Madison, WI), Group Health Cooperative Of South Central Wisconsin (Madison, WI) and University Of Wisconsin Medical Foundation, Inc (Middleton, WI). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Robert Zaas's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Robert Zaas accept?

Health plans from Anthem Blue Cross and Blue Shield and Group Health Cooperative-SCW list Robert Zaas as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Robert Zaas affiliated with any hospitals?

According to CMS data, Robert Zaas is affiliated with University Of Wi Hospitals & Clinics Authority.

When was this NPI record last updated?

The NPPES record for Robert Zaas was last updated on July 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.