William R. De Wolf, M.D.
Internal Medicine Physician · Oakland, CA
William R. De Wolf, M.D. is an internal medicine physician with a practice address in Oakland, California, and NPI 1538274055, issued on Aug 21, 2006. Check the license (California G40902, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William R. De Wolf
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G40902 CA
Self-reported in NPPES; status is on the state search - Practice location
- 350 30TH St Ste 100, Oakland, CA 94609
- Phone
- (510) 204-8290
- Enumerated
- Aug 21, 2006
- Record last updated
- Nov 21, 2023
- Medicare enrollment
- Enrolled (PECOS I20051122000500); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 1978
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 350 30TH St Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William R. De Wolf in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G40902Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,600 Medicare Part D claims for 195 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 195 claims were for opioids.
Most prescribed
- Atorvastatin Calcium142 claims
- Losartan Potassium114 claims
- Levothyroxine Sodium90 claims
- Lorazepam86 claims
- Gabapentin78 claims
- Hydrocodone-Acetaminophen74 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationOakland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William R. De Wolf among 17,696 internal medicine physician records in California
William R. De Wolf, 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. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1978 · median 2004 among the 11,065 with a school on file
- Record last updated2023 · 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).
432 internal medicine physician records list a practice address in Oakland
They are 432 of the 18,558 NPPES records with a practice address in Oakland, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Oakland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Rachel Callaghan, M.D.Oakland, CA 946091548239627
- Samuel Dong, MDOakland, CA 946091528027471
- Amy Garlin, M.D.Oakland, CA 946091346269719
- Marci Gottlieb, MDOakland, CA 946091194785428
- Christopher Hall, M.D.Oakland, CA 946091295754729
- John Jones, MDOakland, CA 946091639139967
- Michael Kim, MDOakland, CA 946091477513703
- Pandora Lee, M.D.Oakland, CA 946091598725327
Common questions
What is William R. De Wolf, M.D.'s NPI number?
William R. De Wolf, M.D.'s National Provider Identifier (NPI) is 1538274055, issued on Aug 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William R. De Wolf, M.D. located?
The NPPES record lists a practice address at 350 30TH St Ste 100, Oakland, CA, 94609. Phone: (510) 204-8290. Providers update this record themselves, so call before visiting.
How can I verify William R. De Wolf, M.D.'s license?
NPPES lists California license number G40902, 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.
How much does William R. De Wolf, M.D. prescribe under Medicare Part D?
In 2024, William R. De Wolf, M.D. had 2,600 Medicare Part D claims for 195 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. 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.