IndividualActive
William Underhill, M.D.
NPI 1285899500 · Family Medicine Physician · Saginaw, MI
William Underhill, M.D. is a Family Medicine Physician provider in Saginaw, MI (NPI 1285899500).
Provider details
- NPI number
- 1285899500
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 023191 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(87/100 index)
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
2770 Freeland Rd. #14
Saginaw, MI 48604-9616
Phone: (989) 245-4927
Street-level locationGet directions
Mailing address
2770 Freeland Rd. #14
Saginaw, MI 48604-9616
Registry dates
- Enumerated
- 2008-07-25
- Last updated
- 2008-07-25
Frequently asked questions
- What is William Underhill's NPI number?
- William Underhill's National Provider Identifier (NPI) is 1285899500, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Underhill's specialty?
- William Underhill is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Underhill located?
- William Underhill's practice location on file with NPPES is 2770 Freeland Rd. #14, Saginaw, MI 48604-9616.
- What is William Underhill's phone number?
- The practice phone number listed in the NPPES registry for William Underhill is (989) 245-4927.
- Is William Underhill's NPI active?
- Yes — William Underhill's NPI (1285899500) is active in the NPPES registry as of the last update on 2008-07-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.