William Holder, PHYSICIAN ASSISTANT
NPI 1699816256 · Physician Assistant · El Cajon, CA
William Holder, PHYSICIAN ASSISTANT is a Physician Assistant provider in El Cajon, CA (NPI 1699816256).
Provider details
- NPI number
- 1699816256
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PHYSICIAN ASSISTANT
- Sex
- Male
- Sole proprietor
- No
- License
- 14647 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
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
Mailing address
Registry dates
- Enumerated
- 2007-02-08
- Last updated
- 2015-05-27
Frequently asked questions
- What is William Holder's NPI number?
- William Holder's National Provider Identifier (NPI) is 1699816256, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Holder's specialty?
- William Holder is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is William Holder located?
- William Holder's practice location on file with NPPES is 133 W Main St Ste 100, El Cajon, CA 92020-3325.
- What is William Holder's phone number?
- The practice phone number listed in the NPPES registry for William Holder is (619) 401-0404.
- Is William Holder's NPI active?
- Yes — William Holder's NPI (1699816256) is active in the NPPES registry as of the last update on 2015-05-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.