William Brennan
NPI 1578100376 · Athletic Trainer · Lapeer, MI
William Brennan is a Athletic Trainer provider in Lapeer, MI (NPI 1578100376).
Provider details
- NPI number
- 1578100376
- Entity type
- Individual
- Primary specialty
- Athletic TrainerRespiratory, Developmental, Rehabilitative and Restorative Service Providers
- Sex
- Male
- Sole proprietor
- Yes
- License
- 5302027722 (MI)
Specialties & taxonomies
Respiratory, Developmental, Rehabilitative and Restorative Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 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
- 2019-11-30
- Last updated
- 2019-11-30
Frequently asked questions
- What is William Brennan's NPI number?
- William Brennan's National Provider Identifier (NPI) is 1578100376, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Brennan's specialty?
- William Brennan is listed in the NPPES registry with a primary specialty of Athletic Trainer (Respiratory, Developmental, Rehabilitative and Restorative Service Providers).
- Where is William Brennan located?
- William Brennan's practice location on file with NPPES is 540 S Main St, Lapeer, MI 48446-2467.
- What is William Brennan's phone number?
- The practice phone number listed in the NPPES registry for William Brennan is (810) 664-0391.
- Is William Brennan's NPI active?
- Yes — William Brennan's NPI (1578100376) is active in the NPPES registry as of the last update on 2019-11-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.