William Bull, MD
NPI 1104511179 · Internal Medicine Physician · Madison, WI
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Bull, MD is a Internal Medicine Physician provider in Madison, WI (NPI 1104511179).
Provider details
- NPI number
- 1104511179
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 85839-20 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Atorvastatin Calcium | 23 |
| Venlafaxine Hclbrand: Venlafaxine Hcl Er | 12 |
| Bupropion Hclbrand: Bupropion Xl | 12 |
| Aripiprazole | 12 |
| Hydrochlorothiazide | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 749 University Row Ste 200Madison, WI 53705-1465Phone: (608) 263-6400
Registry dates
- Enumerated
- 2023-04-06
- Last updated
- 2025-06-12
- Certified
- 2025-06-12
Frequently asked questions
- What is William Bull's NPI number?
- William Bull's National Provider Identifier (NPI) is 1104511179, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Bull's specialty?
- William Bull is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Bull located?
- William Bull's practice location on file with NPPES is 600 Highland Ave, Madison, WI 53792-0001.
- What is William Bull's phone number?
- The practice phone number listed in the NPPES registry for William Bull is (608) 263-6400.
- Does William Bull accept Medicare?
- William Bull is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Bull's NPI active?
- Yes — William Bull's NPI (1104511179) is active in the NPPES registry as of the last update on 2025-06-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.