William J. McAllister, M.D.
Internal Medicine Physician · Corte Madera, CA
William J. McAllister, M.D. is an internal medicine physician with a practice address in Corte Madera, California, and NPI 1821072646, issued on Dec 5, 2005. Check the license (California G18899, 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 J. McAllister
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G18899 CA
Self-reported in NPPES; status is on the state search - Practice location
- 21 Tamal Vista Blvd, Corte Madera, CA 94925
- Phone
- (415) 924-5010
- Enumerated
- Dec 5, 2005
- Record last updated
- Feb 13, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (415) 924-5210
- Entity
- Type 1 · individual
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Verify William J. McAllister in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G18899Check 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 J. McAllister among 17,696 internal medicine physician records in California
William J. McAllister, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2017 · 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).
4 internal medicine physician records list a practice address in Corte Madera
They are 4 of the 365 NPPES records with a practice address in Corte Madera, 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 Corte Madera → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Sajot Grewal, M.D.Corte Madera, CA 949251144230053
- Alfred Oppenheim, M.D.Corte Madera, CA 949251023028917
- Ruth Rubin, M.D.Corte Madera, CA 949251043238041
- Nana Barnes, MDRohnert Park, CA 949281063900520
- Michael Bunce, MDRohnert Park, CA 949281740369875
- Sara Ganeless Levine, MDRohnert Park, CA 949281326122490
- Steven Gelber, M.D.Rohnert Park, CA 949281144495326
- Paul Johnson, MDRohnert Park, CA 949281881778876
Common questions
What is William J. McAllister, M.D.'s NPI number?
William J. McAllister, M.D.'s National Provider Identifier (NPI) is 1821072646, issued on Dec 5, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William J. McAllister, M.D. located?
The NPPES record lists a practice address at 21 Tamal Vista Blvd, Corte Madera, CA, 94925. Phone: (415) 924-5010. Providers update this record themselves, so call before visiting.
How can I verify William J. McAllister, M.D.'s license?
NPPES lists California license number G18899, 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.