Charles Wang, MD
Gastroenterology Physician · Oakland, CA
Charles Wang, MD is a gastroenterology physician with a practice address in Oakland, California, and NPI 1134389810, issued on Jun 16, 2008. Check the license (California A136871, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Charles Wang
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A136871 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1800 Harrison St, 7TH FL, Oakland, CA 94612
- Phone
- (916) 784-4000
- Enumerated
- Jun 16, 2008
- Record last updated
- Aug 6, 2024
- Medicare enrollment
- Enrolled (PECOS I20150903003038); accepts Medicare assignment
- Medical or professional school
- State University Of New York Downstate Medical Center, 2008
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 1800 Harrison St, 7TH FL
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Valentina Pejuhesh, MFT INTERNMarriage & Family Therapist1093164519
Verify Charles Wang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A136871Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
14% more Medicare Part D claims than the average gastroenterology physician in 2024
921 Medicare Part D claims for 474 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Gavilyte-C254 claims
- Pantoprazole Sodium115 claims
- Omeprazole65 claims
- Mesalamine52 claims
- Cholestyramine Light36 claims
- Cholestyramine27 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
- Permanente Medical Group IncRoseville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Charles Wang among 2,140 gastroenterology physician records in California
Charles Wang, MD is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 63% of them.
- NPI issued2008 · 63% of these records are older, 31% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2008 · median 2002 among the 1,538 with a school on file
- Record last updated2024 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Oakland → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Paul Chard, MD PHDOakland, CA 946121427006006
- Susie Cohn, MDOakland, CA 946121205161130
- Earl Darby, MDOakland, CA 946121790743292
- Thomas Hargrave, MDOakland, CA 946121023076692
- Kevin KaneOakland, CA 946121396109914
- Neil Stollman, MDOakland, CA 946121225095763
- Liana Vesga, MDOakland, CA 946121225058159
- Silvia Villagomez, MDOakland, CA 946121790743359
Common questions
What is Charles Wang, MD's NPI number?
Charles Wang, MD's National Provider Identifier (NPI) is 1134389810, issued on Jun 16, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Charles Wang, MD located?
The NPPES record lists a practice address at 1800 Harrison St, 7TH FL, Oakland, CA, 94612. Phone: (916) 784-4000. Providers update this record themselves, so call before visiting.
How can I verify Charles Wang, MD's license?
NPPES lists California license number A136871, 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 Charles Wang, MD prescribe under Medicare Part D?
In 2024, Charles Wang, MD had 921 Medicare Part D claims for 474 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.