What is William Gregg's NPI number?

William Gregg's National Provider Identifier (NPI) is 1568589729, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is William Gregg's specialty?

William Gregg is listed in the NPPES registry with a primary specialty of Dentist (Dental Providers).

Where is William Gregg located?

William Gregg's practice location on file with NPPES is 23321 El Toro Rd, Lake Forest, CA 92630-4825.

What is William Gregg's phone number?

The practice phone number listed in the NPPES registry for William Gregg is (949) 770-7686.

Is William Gregg's NPI active?

Yes — William Gregg's NPI (1568589729) is active in the NPPES registry as of the last update on 2007-07-08.

IndividualActive

William Gregg, DDS

NPI 1568589729 · Dentist · Lake Forest, CA

William Gregg, DDS is a Dentist provider in Lake Forest, CA (NPI 1568589729).

Provider details

NPI number: 1568589729
Entity type: Individual
Primary specialty: DentistDental Providers
Credential: DDS
Sex: Male
Sole proprietor: Yes
License: 26644 (CA)

Specialties & taxonomies

DentistPrimary122300000XLicense 26644 (CA)
Dental Providers

Profile Score

Detailed profile(89/100 index)

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

23321 El Toro Rd

Suite D

Lake Forest, CA 92630-4825

Phone: (949) 770-7686

Fax: (949) 770-0725

Street-level locationGet directions

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Mailing address