William Gustin, MD
Hospitalist Physician · San Juan Capistrano, CA
William Gustin, MD is a hospitalist physician with a practice address in San Juan Capistrano, California, and NPI 1457431504, issued on Oct 16, 2006. Check the license (California 000000A77418, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- William Gustin
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- 000000A77418 CA
Self-reported in NPPES; status is on the state search - Practice location
- 30230 Rancho Viejo RD, San Juan Capistrano, CA 92675
- Phone
- (949) 443-4303
- Enumerated
- Oct 16, 2006
- Record last updated
- Oct 6, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (949) 443-4033
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 30230 Rancho Viejo RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Beverly Hendrickson, MDPediatrics Physician1306910906
- Rahul Kale, MDPulmonary Disease Physician1447330915
Verify William Gustin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 000000A77418Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
William Gustin among 3,099 hospitalist physician records in California
William Gustin, MD is one of 3,099 hospitalist physician records with a practice address in California. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 73% newer
- In a Medicare fileNo · 90% of these records are
- In the CMS Doctors and Clinicians fileNo · 81% of these records are
- Record last updated2014 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 3,099 in California → Every provider in San Juan Capistrano → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Chidao Nguyen, DOWestminster, CA 926831780850198
- Gilda Ameri, MDNewport Beach, CA 926631821477498
- John Barakat, M.D.Newport Beach, CA 926631356728174
- Emily Boone, MDNewport Beach, CA 926631760184642
- Austin Crochetiere, MDNewport Beach, CA 926631962082644
- Ali Darwish, MDNewport Beach, CA 926631679079958
- Mohamed Ghyaz, MDNewport Beach, CA 926631649858051
- Phuonganh Le, MDNewport Beach, CA 926631265061626
Common questions
What is William Gustin, MD's NPI number?
William Gustin, MD's National Provider Identifier (NPI) is 1457431504, issued on Oct 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Gustin, MD located?
The NPPES record lists a practice address at 30230 Rancho Viejo RD, San Juan Capistrano, CA, 92675. Phone: (949) 443-4303. Providers update this record themselves, so call before visiting.
How can I verify William Gustin, MD's license?
NPPES lists California license number 000000A77418, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.