William Blaschko, M.D.
Family Medicine Physician · San Francisco, CA
William Blaschko, M.D. is a family medicine physician with a practice address in San Francisco, California, and NPI 1891709689, issued on Jul 28, 2006. Check the license (California G42865, 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 Blaschko
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G42865 CA
Self-reported in NPPES; status is on the state search - Practice location
- 400 Parnassus Ave, San Francisco, CA 94143
- Phone
- (760) 674-3847
- Enumerated
- Jul 28, 2006
- Record last updated
- Jan 28, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00G428650 CA
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
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A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Blaschko in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G42865Check 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 Blaschko among 17,133 family medicine physician records in California
William Blaschko, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileNo · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Family Medicine Physician providers in California
There are 17,133 family medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,133 in California → Every provider in San Francisco → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Daniel Ciccarone, MD, MPHSan Francisco, CA 941431891900544
- Norman Hearst, MDSan Francisco, CA 941431194782714
- Laura Hill-Sakurai, MDSan Francisco, CA 941431689622078
- Sagar Kadakia, DOSan Francisco, CA 941431154909240
- Jirayut Latthivongskorn, MD, MPHSan Francisco, CA 941431508422403
- Michael Potter, M.D.San Francisco, CA 941431952347288
- James Radford, DO, DCSan Francisco, CA 941431023188026
- Heidi Reetz, M.D.San Francisco, CA 941431295901072
Common questions
What is William Blaschko, M.D.'s NPI number?
William Blaschko, M.D.'s National Provider Identifier (NPI) is 1891709689, issued on Jul 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Blaschko, M.D. located?
The NPPES record lists a practice address at 400 Parnassus Ave, San Francisco, CA, 94143. Phone: (760) 674-3847. Providers update this record themselves, so call before visiting.
How can I verify William Blaschko, M.D.'s license?
NPPES lists California license number G42865, 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.