IndividualActive
William Day, MSW
NPI 1184934309 · Social Worker · New York, NY
William Day, MSW is a Social Worker provider in New York, NY (NPI 1184934309).
Provider details
- NPI number
- 1184934309
- Entity type
- Individual
- Primary specialty
- Social WorkerBehavioral Health & Social Service Providers
- Credential
- MSW
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(76/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
83% 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
423 E 23rd St
New York, NY 10010-5011
Phone: (212) 686-7500
Street-level locationGet directions
Mailing address
506 Fort Washington Ave
New York, NY 10033-2049
Registry dates
- Enumerated
- 2010-10-21
- Last updated
- 2010-10-21
Frequently asked questions
- What is William Day's NPI number?
- William Day's National Provider Identifier (NPI) is 1184934309, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Day's specialty?
- William Day is listed in the NPPES registry with a primary specialty of Social Worker (Behavioral Health & Social Service Providers).
- Where is William Day located?
- William Day's practice location on file with NPPES is 423 E 23rd St, New York, NY 10010-5011.
- What is William Day's phone number?
- The practice phone number listed in the NPPES registry for William Day is (212) 686-7500.
- Is William Day's NPI active?
- Yes — William Day's NPI (1184934309) is active in the NPPES registry as of the last update on 2010-10-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.