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ALISA L WILLIAMS, MD, FACOG, INC.
NPI 1083887921
Specialist in San Diego, CA

Active since April 11, 2008
5555 RESERVOIR DR STE 307, SAN DIEGO, CA 92120(619) 299-3111(619) 299-3126 Get Directions Write a Review

NPPES record last updated: January 2, 2020. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Alisa L Williams, Md, Facog, Inc. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALISA L WILLIAMS, MD, FACOG, INC. (NPI 1083887921) is a healthcare organization registered as a specialist in San Diego, California and active in the NPI registry since April 2008. The organization lists Alisa Lynn Williams, Officer, as its authorized official.

NPPES Registry Identity

NPI1083887921
Entity TypeOrganization
Primary Taxonomy174400000X
Legal Business NameALISA L WILLIAMS, MD, FACOG, INC.
Location Address5555 RESERVOIR DR STE 307San Diego, CA 92120-5134
Mailing Address5555 Reservoir Dr Ste 307San Diego, CA 92120-5134 · (619) 299-3111 · Fax (619) 299-3126
Phone(619) 299-3111
Fax(619) 299-3126
Organization SubpartNo
Authorized OfficialAlisa Lynn WilliamsOfficer · (619) 299-3111
Enumeration DateApril 11, 2008
Last NPPES UpdateJanuary 2, 2020
✔ NPI 1083887921 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers
Taxonomy Code174400000X
License✔ Licensed in CA · G60944
Definition
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
5555 RESERVOIR DR STE 307, San Diego, CA 92120
Open in Google Maps ↗

Other Identifiers 1

Medicaid000G609440CA

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Alisa L Williams, Md, Facog, Inc. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Alisa L Williams, MD, Facog, Inc., which bills Medicare for the services this clinician delivers.

Clinician (1)

Alisa Williams, M.D.
Obstetrics/Gynecology
NPI 1720006398
5555 RESERVOIR DR STE 307
San Diego, CA 92120
(619) 299-3111
✔ PECOS✔ Accepts MedicareSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Alisa L Williams, MD, Facog, Inc.'s NPI number?

The NPI number for Alisa L Williams, MD, Facog, Inc. is 1083887921. It was assigned to this organization in the NPPES registry on April 11, 2008.

Where is Alisa L Williams, MD, Facog, Inc. located?

Alisa L Williams, MD, Facog, Inc. is located at 5555 Reservoir Dr Ste 307, San Diego, CA 92120. The listed phone number is (619) 299-3111.

What is Alisa L Williams, MD, Facog, Inc.'s specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Alisa L Williams, MD, Facog, Inc. enrolled in Medicare?

Yes. Alisa L Williams, MD, Facog, Inc. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Alisa L Williams, MD, Facog, Inc.?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Obstetrics/Gynecology) reassigns their Medicare billing to Alisa L Williams, MD, Facog, Inc.. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Alisa L Williams, MD, Facog, Inc. was last updated on January 2, 2020. 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.