Walter Gilliam, PHD
NPI 1588623938 · Clinical Child & Adolescent Psychologist · New Haven, CT
Walter Gilliam, PHD is a Clinical Child & Adolescent Psychologist provider in New Haven, CT (NPI 1588623938).
Provider details
- NPI number
- 1588623938
- Entity type
- Individual
- Primary specialty
- Clinical Child & Adolescent PsychologistBehavioral Health & Social Service Providers
- Credential
- PHD
- Sex
- Male
- License
- 002137 (CT)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
- 2006-03-22
- Last updated
- 2007-07-08
Frequently asked questions
- What is Walter Gilliam's NPI number?
- Walter Gilliam's National Provider Identifier (NPI) is 1588623938, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Walter Gilliam's specialty?
- Walter Gilliam is listed in the NPPES registry with a primary specialty of Clinical Child & Adolescent Psychologist (Behavioral Health & Social Service Providers).
- Where is Walter Gilliam located?
- Walter Gilliam's practice location on file with NPPES is 800 Howard Avenue, New Haven, CT 06519.
- What is Walter Gilliam's phone number?
- The practice phone number listed in the NPPES registry for Walter Gilliam is (203) 785-2140.
- Is Walter Gilliam's NPI active?
- Yes — Walter Gilliam's NPI (1588623938) 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.