DR. WILLIAM HENRY BULL V MD
NPI 1104511179
Internal Medicine in Beaver Dam, WI
About Dr. William Henry Bull V Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM HENRY BULL V MD (NPI 1104511179) is an individual internal medicine provider in Beaver Dam, Wisconsin, licensed in Wisconsin (85839-20) and active in the NPI registry since April 2023. He is enrolled in Medicare PECOS, is affiliated with Marshfield Medical Center - Beaver Dam (mmc-bd), and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Accepted 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
Dr. William Henry Bull V Md 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.
Medicare Billing Reassignment
Medicare enrollment records show William Bull reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Middleton, WI 53562
- Reassigned Medicare billing, Wisconsin enrollment
- 2,832 clinicians in this Medicare group
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Marshfield Medical Center - Beaver Dam (mmc-Bd)
Acute Care Hospitals · Beaver Dam, WIUniversity Of Wi Hospitals & Clinics Authority
Acute Care Hospitals · Madison, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 53916 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
BEAVER DAM, WI 53916
BEAVER DAM, WI 53916
BEAVER DAM, WI 53916
BEAVER DAM, WI 53916
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 William Bull's NPI number?
The NPI number for William Bull is 1104511179. It was assigned to this individual provider in the NPPES registry on April 6, 2023.
Where is William Bull located?
William Bull practices at 705 S University Ave, Beaver Dam, WI 53916. The listed phone number is (920) 887-9272.
What is William Bull's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is William Bull enrolled in Medicare?
Yes. William Bull 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 organization bills Medicare for William Bull's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Bull reassigns Medicare benefits to University Of Wisconsin Medical Foundation, Inc (Middleton, WI). The 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 William Bull's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Bull accept?
Health plans from Anthem Blue Cross and Blue Shield, Aspirus Health Plan, Group Health Cooperative-SCW, HealthPartners and Network Health and 2 other insurers list William Bull 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 William Bull affiliated with any hospitals?
According to CMS data, William Bull is affiliated with Marshfield Medical Center - Beaver Dam (mmc-Bd) and University Of Wi Hospitals & Clinics Authority.
When was this NPI record last updated?
The NPPES record for William Bull was last updated on June 11, 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.
# Dr. William Henry Bull V, MD · NPI 1104511179
Internal Medicine physician in Beaver Dam, Wisconsin. Individual provider, active in the CMS NPPES registry since April 6, 2023.
## Identity
- **NPI:** 1104511179 (Entity type: Individual)
- **Enumerated:** April 6, 2023
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 85839-20 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 705 S UNIVERSITY AVE, Beaver Dam, WI 53916-3053
- **Phone:** (920) 887-9272
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** University Of Wisconsin Medical Foundation, Inc (NPI 1598784555, Middleton, WI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Wisconsin School Of Medicine, class of 2023
## Record status
- **NPPES last updated:** June 11, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1104511179) · Data from the CMS NPPES public registry.