IndividualActive
William Duffy, R.N.
NPI 1669757084 · Registered Nurse · Centereach, NY
William Duffy, R.N. is a Registered Nurse provider in Centereach, NY (NPI 1669757084).
Provider details
- NPI number
- 1669757084
- Entity type
- Individual
- Primary specialty
- Registered NurseNursing Service Providers
- Credential
- R.N.
- Sex
- Male
- Sole proprietor
- No
- License
- 567015-1 (NY)
Specialties & taxonomies
Nursing Service Providers
Profile Score
Detailed profile(81/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
14 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
33 Ulrich Rd
Centereach, NY 11720-4012
Phone: (845) 709-3711
Street-level locationGet directions
Mailing address
33 Ulrich Road
Centereach, NY 11720
Registry dates
- Enumerated
- 2011-10-17
- Last updated
- 2011-10-17
Frequently asked questions
- What is William Duffy's NPI number?
- William Duffy's National Provider Identifier (NPI) is 1669757084, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Duffy's specialty?
- William Duffy is listed in the NPPES registry with a primary specialty of Registered Nurse (Nursing Service Providers).
- Where is William Duffy located?
- William Duffy's practice location on file with NPPES is 33 Ulrich Rd, Centereach, NY 11720-4012.
- What is William Duffy's phone number?
- The practice phone number listed in the NPPES registry for William Duffy is (845) 709-3711.
- Is William Duffy's NPI active?
- Yes — William Duffy's NPI (1669757084) is active in the NPPES registry as of the last update on 2011-10-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.