William Joseph McGuinness, M.D.
Internal Medicine Physician · Corcoran, CA
William Joseph McGuinness, M.D. is an internal medicine physician with a practice address in Corcoran, California, and NPI 1881893667, issued on Jul 12, 2007. Check the license (California C50798, 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 Joseph McGuinness
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- C50798 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4001 W. King Ave, Corcoran, CA 93212
- Phone
- (559) 992-8800
- Enumerated
- Jul 12, 2007
- Record last updated
- Jul 12, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (559) 992-6196
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify William Joseph McGuinness in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C50798Check 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 Joseph McGuinness among 17,696 internal medicine physician records in California
William Joseph McGuinness, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2007 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
8 internal medicine physician records list a practice address in Corcoran
They are 8 of the 187 NPPES records with a practice address in Corcoran, and 17,696 internal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,696 in California → Every provider in Corcoran → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Khin Aye, MDCorcoran, CA 932121578653515
- Olga BeregovskayaCorcoran, CA 932121548469117
- Mayer HorenstenCorcoran, CA 932121306045562
- Ngozi Igbinosa, M.DCorcoran, CA 932121629393293
- Perlita McGuinnessCorcoran, CA 932121073712246
- Kim NguyenCorcoran, CA 932121194925552
- Godwin Ugwueze, MDCorcoran, CA 932121609990134
- Leonel Apodaca, MDCoalinga, CA 932101699883157
Common questions
What is William Joseph McGuinness, M.D.'s NPI number?
William Joseph McGuinness, M.D.'s National Provider Identifier (NPI) is 1881893667, issued on Jul 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is William Joseph McGuinness, M.D. located?
The NPPES record lists a practice address at 4001 W. King Ave, Corcoran, CA, 93212. Phone: (559) 992-8800. Providers update this record themselves, so call before visiting.
How can I verify William Joseph McGuinness, M.D.'s license?
NPPES lists California license number C50798, 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.