DR. WILLIAM SOMERVILLE PHD
NPI 1891181368
Psychologist - Clinical in Ridgewood, NY
About Dr. William Somerville Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM SOMERVILLE PHD (NPI 1891181368) is an individual clinical provider in Ridgewood, New York, licensed in New York (022436) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS, maintains a secondary practice location in Brooklyn, and is a graduate of Other (2016).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. William Somerville Phd is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show William Somerville reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Ridgewood, NY 11385
- Reassigned Medicare billing, New York enrollment
- 2 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11385 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is William Somerville's NPI number?
The NPI number for William Somerville is 1891181368. It was assigned to this individual provider in the NPPES registry on April 12, 2015.
Where is William Somerville located?
William Somerville practices at 1639 Centre St # 141, Ridgewood, NY 11385. The listed phone number is (718) 594-2458.
What is William Somerville's specialty?
The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.
Is William Somerville enrolled in Medicare?
Yes. William Somerville is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for William Somerville's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Somerville reassigns Medicare benefits to Alliance Psychological Services Of New York, PLLC (Ridgewood, NY). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for William Somerville's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for William Somerville was last updated on November 17, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. William Somerville, PHD · NPI 1891181368
Clinical provider in Ridgewood, New York. Individual provider, active in the CMS NPPES registry since April 12, 2015.
## Identity
- **NPI:** 1891181368 (Entity type: Individual)
- **Enumerated:** April 12, 2015
- **Primary specialty:** Psychologist - Clinical · taxonomy 103TC0700X
- **State license:** 022436 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 1639 CENTRE ST # 141, Ridgewood, NY 11385-5335
- **Phone:** (718) 594-2458 · **Fax:** (718) 425-9862
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Alliance Psychological Services Of New York, PLLC (NPI 1508374646, Ridgewood, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2016
## Record status
- **NPPES last updated:** November 17, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1891181368) · Data from the CMS NPPES public registry.