William Hisgen, M.D.
NPI 1952554966 · Geriatric Medicine (Internal Medicine) Physician · Madison, WI
William Hisgen, M.D. is a Geriatric Medicine (Internal Medicine) Physician provider in Madison, WI (NPI 1952554966).
Provider details
- NPI number
- 1952554966
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 16404 (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
17 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-11-04
- Last updated
- 2008-11-04
Frequently asked questions
- What is William Hisgen's NPI number?
- William Hisgen's National Provider Identifier (NPI) is 1952554966, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Hisgen's specialty?
- William Hisgen is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is William Hisgen located?
- William Hisgen's practice location on file with NPPES is 1215 Garfield St, Madison, WI 53711-2215.
- What is William Hisgen's phone number?
- The practice phone number listed in the NPPES registry for William Hisgen is (608) 256-3489.
- Is William Hisgen's NPI active?
- Yes — William Hisgen's NPI (1952554966) is active in the NPPES registry as of the last update on 2008-11-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.