Thomas Holobyn
NPI 1891114542 · Internal Medicine Physician · Madison, WI
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Holobyn is a Internal Medicine Physician provider in Madison, WI (NPI 1891114542).
Provider details
- NPI number
- 1891114542
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 65132 (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
12 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
- 2014-04-09
- Last updated
- 2017-03-07
Frequently asked questions
- What is Thomas Holobyn's NPI number?
- Thomas Holobyn's National Provider Identifier (NPI) is 1891114542, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Holobyn's specialty?
- Thomas Holobyn is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Holobyn located?
- Thomas Holobyn's practice location on file with NPPES is Uw Hospital and Clinics, Madison, WI 53792-0001.
- What is Thomas Holobyn's phone number?
- The practice phone number listed in the NPPES registry for Thomas Holobyn is (608) 263-5660.
- Does Thomas Holobyn accept Medicare?
- Thomas Holobyn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Holobyn's NPI active?
- Yes — Thomas Holobyn's NPI (1891114542) is active in the NPPES registry as of the last update on 2017-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.