1. Home
  2. Directory
  3. California
  4. Lake Forest
  5. Dentist
  6. NPI Profile

DR. WILLIAM YOUNG GREGG DDS
NPI 1568589729
Dentist in Lake Forest, CA

Active since March 23, 2007
23321 EL TORO RD, SUITE D, LAKE FOREST, CA 92630(949) 770-7686(949) 770-0725 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. William Young Gregg Dds NPPES

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

DR. WILLIAM YOUNG GREGG DDS (NPI 1568589729) is an individual dentist in Lake Forest, California, licensed in California (26644) and active in the NPI registry since March 2007.

NPPES Registry Identity

NPI1568589729
Entity TypeIndividualMale
Primary Taxonomy122300000X
Provider Legal NameDR. WILLIAM YOUNG GREGGCredential: DDS
Location Address23321 EL TORO RD, SUITE DLake Forest, CA 92630-4825
Mailing Address23321 El Toro Rd, Suite DLake Forest, CA 92630-4825 · (949) 770-7686 · Fax (949) 770-0725
Phone(949) 770-7686
Fax(949) 770-0725
Sole ProprietorYes
Enumeration DateMarch 23, 2007
Last NPPES UpdateJuly 8, 2007
✔ NPI 1568589729 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentistDental Providers
Taxonomy Code122300000X
License✔ Licensed in CA · 26644
Definition
A dentist is a person qualified by a doctorate in dental surgery (D.D.S.) or dental medicine (D.M.D.), licensed by the state to practice dentistry, and practicing within the scope of that license. There is no difference between the two degrees: dentists who have a DMD or DDS have the same education. Universities have the prerogative to determine what degree is awarded. Both degrees use the same curriculum requirements set by the American Dental Association's Commission on Dental Accreditation. Generally, three or more years of undergraduate education plus four years of dental school is required to graduate and become a general dentist. State licensing boards accept either degree as equivalent, and both degrees allow licensed individuals to practice the same scope of general dentistry. Additional post-graduate training is required to become a dental specialist.
23321 EL TORO RD, Lake Forest, CA 92630
Open in Google Maps ↗

Other Providers at the Same Location NPPES 11

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CUONG LY MD, INC
Internal Medicine (Nephrology)
23321 EL TORO RD, SUITE H
LAKE FOREST, CA 92630
Orange County (949) 305-2660
DR. JENNIFER BLAKE ELI D.M.D.
Dentist (General Practice)
23321 EL TORO RD, SUTIE D
LAKE FOREST, CA 92630
Orange County (949) 735-3259
MICHAEL BISSIRI DDS
Dentist (General Practice)
23321 EL TORO RD, SUITE B
LAKE FOREST, CA 92630
Orange County (949) 770-6966
ANNEKE SAGER C.P.N.P.
Nurse Practitioner (Pediatrics)
23321 EL TORO RD, SUITES F&G
LAKE FOREST, CA 92630
Orange County (949) 858-1100
REX CHUANG, DDS, INC.
Dentist (Pediatric Dentistry)
23321 EL TORO RD, SUITE C
LAKE FOREST, CA 92630
Orange County (949) 916-9798
LISA WALPERT F.N.P.
Nurse Practitioner (Pediatrics)
23321 EL TORO RD, SUITES F&G
LAKE FOREST, CA 92630
Orange County (949) 858-1100
MRS. JUDITH WHITNEY LEONARD PNP, BC
Nurse Practitioner (Pediatrics)
23321 EL TORO RD, SUITES F & G
LAKE FOREST, CA 92630
Orange County (949) 770-0513
TERENCE CHU M.D.
Pediatrics
23321 EL TORO RD, SUITES F&G
LAKE FOREST, CA 92630
Orange County (949) 770-0513

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 Gregg's NPI number?

The NPI number for William Gregg is 1568589729. It was assigned to this individual provider in the NPPES registry on March 23, 2007.

Where is William Gregg located?

William Gregg practices at 23321 El Toro Rd Suite D, Lake Forest, CA 92630. The listed phone number is (949) 770-7686.

What is William Gregg's specialty?

The primary specialty registered for this NPI is Dentist with taxonomy code 122300000X.

When was this NPI record last updated?

The NPPES record for William Gregg was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.