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D WILLIAM NGUYEN MD APC
NPI 1457032732
Psychiatry & Neurology - Psychiatry in San Diego, CA

Active since July 28, 2023
9855 ERMA RD STE 133, SAN DIEGO, CA 92131(760) 656-5523(619) 280-5800 Get Directions Write a Review

NPPES record last updated: June 17, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jun 17, 2024, Jul 28, 2023 (2 updates tracked since 2023).

About D William Nguyen Md Apc NPPES

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

D WILLIAM NGUYEN MD APC (NPI 1457032732) is a healthcare organization registered as a psychiatry in San Diego, California and active in the NPI registry since July 2023. The organization maintains a secondary practice location in La Mesa and lists Mai Linh Hoang, Ceo, as its authorized official.

NPPES Registry Identity

NPI1457032732
Entity TypeOrganization
Primary Taxonomy2084P0800X
Legal Business NameD WILLIAM NGUYEN MD APC
Location Address9855 ERMA RD STE 133San Diego, CA 92131-1092
Mailing AddressPo Box 8005Rancho Santa Fe, CA 92067-8005 · (858) 349-3760
Phone(760) 656-5523
Fax(619) 280-5800
Organization SubpartNo
Authorized OfficialMai Linh HoangCeo · (858) 349-3760
Enumeration DateJuly 28, 2023
Last NPPES UpdateJune 17, 20242 updates tracked since enumeration
NPPES CertifiedJune 17, 2024
✔ NPI 1457032732 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
Also ListedPsychiatry & Neurology · NeurologyTaxonomy 2084N0400X
9855 ERMA RD STE 133, San Diego, CA 92131
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Secondary Practice Location 1

Location 15565 Grossmont Center Dr Ste 229LA Mesa, CA 91942-3026 · Phone (858) 349-3760

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-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)

D William Nguyen Md Apc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

9

Medicare enrollment records show 9 clinicians reassign Medicare billing to D William Nguyen MD Apc, which bills Medicare for the services they deliver. Of these, 1 practice within 10 miles. They are listed nearest first.

Clinicians, nearest first (9)

Jeffensen Jay Timacdog
Nurse Practitioner
NPI 1083103956
6920 MIRAMAR RD STE 326
San Diego, CA 92121
(619) 345-0086
✔ PECOS✔ Accepts Medicare4.1 mi
Stephen Kaiser, M.D.
Psychiatry
NPI 1245677624
5555 GROSSMONT CENTER DR
La Mesa, CA 91942
(619) 356-3216
✔ PECOS✔ Accepts Medicare11 mi
Brandon Ro, MSN, PMHNP
Nurse Practitioner
NPI 1487381059
5565 GROSSMONT CENTER DR STE 229
La Mesa, CA 91942
(858) 342-4572
✔ PECOS✔ Accepts Medicare11 mi
Markus Ploesser, MD
Psychiatry
NPI 1669662755
CDCR 765 THIRD AVENUE STE 300
Chula Vista, CA 91910
(619) 476-3700
✔ PECOS✔ Accepts Medicare20 mi
Rani Barba, NP
Nurse Practitioner
NPI 1912571944
374 H ST STE 201
Chula Vista, CA 91910
(619) 349-0949
✔ PECOS21 mi
Brittany Voelker, PSYCHOLOGIST 35615
Psychiatry
NPI 1841096492
1269 INDIAN CREEK DR
Chula Vista, CA 91915
(619) 755-5589
✔ PECOS✔ Accepts Medicare21 mi
Jusac Suryanata, NP
Nurse Practitioner
NPI 1124897046
3308 CAROLYN CIR
Oceanside, CA 92054
(760) 658-4405
✔ PECOS✔ Accepts Medicare24 mi
Benjamin Gross, M.D.
Neurology
NPI 1124053665
6221 WILSHIRE BLVD SUITE 509
Los Angeles, CA 90048
(323) 939-1689
✔ PECOS✔ Accepts Medicare107 mi
Sukhjit Mann, PHD
Clinical Psychologist
NPI 1972149706
2140 N WINERY AVE STE 101
Fresno, CA 93703
(559) 216-0125
✔ PECOS✔ Accepts Medicare304 mi

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 D William Nguyen MD Apc's NPI number?

The NPI number for D William Nguyen MD Apc is 1457032732. It was assigned to this organization in the NPPES registry on July 28, 2023.

Where is D William Nguyen MD Apc located?

D William Nguyen MD Apc is located at 9855 Erma Rd Ste 133, San Diego, CA 92131. The listed phone number is (760) 656-5523.

What is D William Nguyen MD Apc's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is D William Nguyen MD Apc enrolled in Medicare?

Yes. D William Nguyen MD Apc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through D William Nguyen MD Apc?

According to the CMS Revalidation Reassignment List (October 2026 release), 9 clinicians in 4 Medicare specialties reassign their Medicare billing to D William Nguyen MD Apc. 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. The largest specialties are Nurse Practitioner (4), Psychiatry (3) and Clinical Psychologist (1). Of these, 1 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for D William Nguyen MD Apc was last updated on June 17, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.