William Castro, M.D.
Family Medicine Physician · Huntington Beach, CA
William Castro, M.D. is a family medicine physician with a practice address in Huntington Beach, California, and NPI 1366607848, issued on Jul 23, 2008. Check the license (California A119270, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Castro
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A119270 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8041 Newman Ave, Huntington Beach, CA 92647
- Phone
- (714) 500-0228
- Enumerated
- Jul 23, 2008
- Record last updated
- Oct 10, 2013 (not updated in 13 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 8041 Newman Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jessica Abraham, PHARM.DPharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1316299621
- Jessica ArredondoCase Manager/Care Coordinator1447409057
- Rajni Boparai, M.D.Family Medicine Physician1578945663
- Mary Cavalier, FNPFamily Nurse Practitioner1255485744
- Tiffany Chou, FNPFamily Nurse Practitioner1457859183
- Maria Cortes, LVNLicensed Vocational Nurse1790875243
Verify William Castro in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A119270Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
27% more Medicare Part D claims than the average family medicine physician in 2024
4,496 Medicare Part D claims for 300 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 59 claims were for opioids.
Most prescribed
- Atorvastatin Calcium366 claims
- Ozempic239 claims
- Losartan Potassium233 claims
- Metformin Hcl233 claims
- Lisinopril153 claims
- Gabapentin145 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.
Industry payments in 2024: $32.56
1 payment: food and beverage; the largest payer was Hologic Sales and Service, LLC. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
William Castro among 17,133 family medicine physician records in California
William Castro, 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. Its NPI, issued in 2008, is newer than 53% of them.
- NPI issued2008 · 53% of these records are older, 42% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2013 · 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).
83 family medicine physician records list a practice address in Huntington Beach
They are 83 of the 4,031 NPPES records with a practice address in Huntington Beach, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Huntington Beach → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Bassil Aish, MDHuntington Beach, CA 926471124015888
- Philip Chan, MDHuntington Beach, CA 926471619095528
- Erica Chang, MDHuntington Beach, CA 926471992922645
- Rosemary Donaldson-Ford, MDHuntington Beach, CA 926471659399301
- Richard Enns, M.D.Huntington Beach, CA 926471891866950
- Nahid Eskandari, MDHuntington Beach, CA 926471528277233
- Howard Frankel, MD PHDHunington Beach, CA 926471881661452
- Julia Heng, MDHuntington Beach, CA 926471720175326
Common questions
What is William Castro, M.D.'s NPI number?
William Castro, M.D.'s National Provider Identifier (NPI) is 1366607848, issued on Jul 23, 2008. An NPI identifies a provider in billing; it is not a license.
Where is William Castro, M.D. located?
The NPPES record lists a practice address at 8041 Newman Ave, Huntington Beach, CA, 92647. Phone: (714) 500-0228. Providers update this record themselves, so call before visiting.
How can I verify William Castro, M.D.'s license?
NPPES lists California license number A119270, 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 Castro, M.D. prescribe under Medicare Part D?
In 2024, William Castro, M.D. had 4,496 Medicare Part D claims for 300 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.