William Wang, D.O.
Internal Medicine Physician · Whittier, CA
William Wang, D.O. is an internal medicine physician with a practice address in Whittier, California, and NPI 1508213646, issued on May 18, 2016. Check the license (California 20A22387, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Wang
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A22387 CA
Self-reported in NPPES; status is on the state search - Practice location
- 15725 Whittier Blvd Ste 400, Whittier, CA 90603
- Phone
- (562) 947-1669
- Enumerated
- May 18, 2016
- Record last updated
- May 23, 2024
- Fax
- (562) 464-5134
- Medicare enrollment
- Enrolled (PECOS I20241011003236); accepts Medicare assignment
- Medical or professional school
- At Still Un Of Hlth Sciences, Col Of Osteo Med, Mesa, 2016
- 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 15725 Whittier Blvd Ste 400
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amber Brown, NURSE PRACTITIONERFamily Medicine Physician1326671942
- Rachel Dimacali, PA-CFamily Medicine Physician1881989846
- Tanya Kantak, DOFamily Medicine Physician1083318224
- Edward KeddaFamily Medicine Physician1639871965
- Cathleen Li, D.OFamily Medicine Physician1275995490
- Tandis Mahani, MDRheumatology Physician1245818178
Verify William Wang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A22387Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.2 times the Medicare Part D claims of the average internal medicine physician in 2024
13,386 Medicare Part D claims for 2,062 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 87 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,073 claims
- Amlodipine Besylate653 claims
- Levothyroxine Sodium626 claims
- Lisinopril604 claims
- Losartan Potassium515 claims
- Metformin Hcl367 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
- Pih Health PhysiciansLa Mirada, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Wang among 17,696 internal medicine physician records in California
William Wang, D.O. 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 2016, is newer than 79% of them.
- NPI issued2016 · 79% of these records are older, 19% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2016 · median 2004 among the 11,065 with a school on file
- Record last updated2024 · 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).
49 internal medicine physician records list a practice address in Whittier
They are 49 of the 2,836 NPPES records with a practice address in Whittier, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Whittier → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Roshel Graham, M.D.Whittier, CA 906031891056388
- Sy Oang, D.O.Whittier, CA 906031972692937
- Sarvesh Parikh, M.D.Whittier, CA 906031932357936
- Bharat Patel, M.D.Whittier, CA 906031265517817
- Anas Abu-Khader, MDWhittier, CA 906021881180784
- Helen Hanna, M.D.Whittier, CA 906021174054639
- Charles Hu, D.O.Whittier, CA 906021699038042
- Phyu Huang, MDWhittier, CA 906021306243597
Common questions
What is William Wang, D.O.'s NPI number?
William Wang, D.O.'s National Provider Identifier (NPI) is 1508213646, issued on May 18, 2016. An NPI identifies a provider in billing; it is not a license.
Where is William Wang, D.O. located?
The NPPES record lists a practice address at 15725 Whittier Blvd Ste 400, Whittier, CA, 90603. Phone: (562) 947-1669. Providers update this record themselves, so call before visiting.
How can I verify William Wang, D.O.'s license?
NPPES lists California license number 20A22387, 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 Wang, D.O. prescribe under Medicare Part D?
In 2024, William Wang, D.O. had 13,386 Medicare Part D claims for 2,062 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.