William Guinan, MD
NPI 1144317520 · Obstetrics & Gynecology Physician · Manchester, CT
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Guinan, MD is a Obstetrics & Gynecology Physician provider in Manchester, CT (NPI 1144317520).
Provider details
- NPI number
- 1144317520
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 028847 (CT)
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
19 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
- 2006-10-06
- Last updated
- 2011-10-27
Frequently asked questions
- What is William Guinan's NPI number?
- William Guinan's National Provider Identifier (NPI) is 1144317520, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Guinan's specialty?
- William Guinan is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is William Guinan located?
- William Guinan's practice location on file with NPPES is 388 West Center St, Manchester, CT 06040.
- What is William Guinan's phone number?
- The practice phone number listed in the NPPES registry for William Guinan is (860) 649-1120.
- Does William Guinan accept Medicare?
- William Guinan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Guinan's NPI active?
- Yes — William Guinan's NPI (1144317520) is active in the NPPES registry as of the last update on 2011-10-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.