Mathew Williams, PH.D.
NPI 1831252204 · Clinical Psychologist · Northport, NY
Enrolled with Medicare as Order and Referring Only - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mathew Williams, PH.D. is a Clinical Psychologist provider in Northport, NY (NPI 1831252204).
Provider details
- NPI number
- 1831252204
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 017560-1 (NY)
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
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
- 2006-12-18
- Last updated
- 2008-04-08
Frequently asked questions
- What is Mathew Williams's NPI number?
- Mathew Williams's National Provider Identifier (NPI) is 1831252204, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mathew Williams's specialty?
- Mathew Williams is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Mathew Williams located?
- Mathew Williams's practice location on file with NPPES is 79 Middleville Rd, Northport, NY 11768-2200.
- What is Mathew Williams's phone number?
- The practice phone number listed in the NPPES registry for Mathew Williams is (631) 261-4400.
- Does Mathew Williams accept Medicare?
- Mathew Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mathew Williams's NPI active?
- Yes — Mathew Williams's NPI (1831252204) is active in the NPPES registry as of the last update on 2008-04-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.