What is William Blank's NPI number?

William Blank's National Provider Identifier (NPI) is 1891912739, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is William Blank's specialty?

William Blank is listed in the NPPES registry with a primary specialty of Psychologist (Behavioral Health & Social Service Providers).

Where is William Blank located?

William Blank's practice location on file with NPPES is 137 Hollow Tree Ridge Rd, Darien, CT 06820-5045.

What is William Blank's phone number?

The practice phone number listed in the NPPES registry for William Blank is (203) 341-2468.

Is William Blank's NPI active?

Yes — William Blank's NPI (1891912739) is active in the NPPES registry as of the last update on 2007-07-08.

IndividualActive

William Blank, PSY.D

NPI 1891912739 · Psychologist · Darien, CT

William Blank, PSY.D is a Psychologist provider in Darien, CT (NPI 1891912739).

Provider details

NPI number: 1891912739
Entity type: Individual
Primary specialty: PsychologistBehavioral Health & Social Service Providers
Credential: PSY.D
Sex: Male
Sole proprietor: Yes
License: 015771-1 (NY)

Practice location

137 Hollow Tree Ridge Rd

Apartment 403

Darien, CT 06820-5045

Phone: (203) 341-2468

Street-level locationGet directions

More CT providers

Mailing address

137 Hollow Tree Ridge Rd

Darien, CT 06820-5045

Specialties & taxonomies

PsychologistPrimary103T00000XLicense 015771-1 (NY)
Behavioral Health & Social Service Providers

Profile Score

Detailed profile(90/100 index)

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.

Enumerated: 2007-04-20
Last updated: 2007-07-08

Frequently asked questions

What is William Blank's NPI number?: William Blank's National Provider Identifier (NPI) is 1891912739, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is William Blank's specialty?: William Blank is listed in the NPPES registry with a primary specialty of Psychologist (Behavioral Health & Social Service Providers).
Where is William Blank located?: William Blank's practice location on file with NPPES is 137 Hollow Tree Ridge Rd, Darien, CT 06820-5045.
What is William Blank's phone number?: The practice phone number listed in the NPPES registry for William Blank is (203) 341-2468.
Is William Blank's NPI active?: Yes — William Blank's NPI (1891912739) is active in the NPPES registry as of the last update on 2007-07-08.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.

Provider details

Practice location

Mailing address

Specialties & taxonomies

Profile Score

Registry dates

Frequently asked questions

Specialties & taxonomies

Profile Score

Frequently asked questions