William Gustin, MD
NPI 1457431504 · Hospitalist Physician · San Juan Capistrano, CA
William Gustin, MD is a Hospitalist Physician provider in San Juan Capistrano, CA (NPI 1457431504).
Provider details
- NPI number
- 1457431504
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 000000A77418 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
- 2006-10-16
- Last updated
- 2014-10-06
Frequently asked questions
- What is William Gustin's NPI number?
- William Gustin's National Provider Identifier (NPI) is 1457431504, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Gustin's specialty?
- William Gustin is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is William Gustin located?
- William Gustin's practice location on file with NPPES is 30230 Rancho Viejo Rd, San Juan Capistrano, CA 92675-1557.
- What is William Gustin's phone number?
- The practice phone number listed in the NPPES registry for William Gustin is (949) 443-4303.
- Is William Gustin's NPI active?
- Yes — William Gustin's NPI (1457431504) is active in the NPPES registry as of the last update on 2014-10-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.