AntimalarialsChloroquineGold
Dr. William Castro Jr., MD
NPI1366607848
- Part D claims, 2024
- 4,496
- Publications
- 7
- Industry payments
- $653
- Affiliated sites
- 1
- State license
- 1
- Practice address
- 8041 Newman Ave, Huntington Beach, CA 92647
- Practice phone
- Call (714) 500-0224
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
AltaMed Medical and Dental Group - Huntington Beach
FQHC - Main Site · Huntington Beach, California
Find Dr. Castro's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. William Castro Jr. is a family medicine physician in Huntington Beach, California
Dr. Castro practices at AltaMed Medical and Dental Group - Huntington Beach in Huntington Beach, California.
Dr. Castro's NPI, 1366607848, was assigned on July 23, 2008. Dr. Castro holds California license A119270.
NPI and contact details
- NPI
- 1366607848NPI Registry (opens in a new tab)
- NPI enumeration date
- July 23, 2008
- NPI status
- Active
- Practice phone
- (714) 500-0224
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. William Castro Jr. practices at AltaMed Medical and Dental Group - Huntington Beach in Huntington Beach, California
Dr. Castro's primary practice is AltaMed Medical and Dental Group - Huntington Beach, at 8041 Newman Ave, Huntington Beach, CA 92647 in Orange County. The practice phone is (714) 500-0224.
- AltaMed Medical and Dental Group - Huntington Beach8041 Newman Ave, Huntington Beach, CA 92647 · Orange CountyPhone(714) 500-0224
Source: Dmand AI Affiliation Data
Dr. William Castro Jr. is affiliated with 1 site of care
Dr. Castro's primary practice is AltaMed Medical and Dental Group - Huntington Beach in Huntington Beach, California. Dr. Castro's employer is on file too: a community health center (fqhc).
AltaMed Medical and Dental Group - Huntington BeachPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William Castro Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Castro practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| AltaMed Medical and Dental Group - Huntington Beach | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every site where Dr. Castro practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. William Castro Jr. is one of 15,680 family medicine physicians in California
Family medicine is Dr. Castro's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Castro is licensed in California.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
Family medicine physicians near Dr. Castro
Counts of family medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William Castro Jr.'s patients have a median age of 60
Across all payers, Dmand AI patient panel data puts Dr. Castro's median patient age at 60, with 63% women.
Dr. Castro's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 60
Patient panel by sex, all payers
- Women63%
- Men37%
Source: Dmand AI Patient Panel Data
Dr. William Castro Jr. wrote 4,496 Medicare Part D claims in 2024
In 2024, Dr. Castro wrote 4,496 Medicare Part D claims for 300 patients. 81% of them were for generic drugs. CMS names the drug for 3,955 of them, across 77 drugs with 11 or more claims each, at $626,344 in total drug cost. In 2023, CMS named 3,606 claims across 74 drugs.
Part D claims, 20244,496
Drugs named by CMS77
Total drug cost$626,344
Part D patients300
Dr. Castro's Part D claims by kind of drug, 2024
- Generic3,651 claims81%
- Brand-name758 claims17%
- Other87 claims2%
Dr. Castro's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Castro's Part D claims, 2024
- Opioids1%59 of 4,496 claims
- Antibiotics1%51 of 4,496 claims
- Antipsychotics, patients 65 and over0%16 of 4,496 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3,6062024: 3,95510%
Drugs named by CMS: 77 in 2024, 74 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
For MedTech and pharma teams
Find family medicine physicians like Dr. Castro by procedure volume and prescribing
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. William Castro Jr. has 7 publications on record
Dmand AI links 7 papers to Dr. Castro, published from 2010 to 2022. The most frequent topics are Antimalarials, Chloroquine and Plasmodium falciparum. Dr. Castro has published most often in J Inorg Biochem. Dr. Castro's most frequent co-author is William G. Castro, MD.
Papers7
Years published2010 to 2022
Dr. Castro's papers by year, 2010 to 2022
Topics Dr. Castro writes about most
- Antimalarials
- Chloroquine
- Plasmodium falciparum
- DNA
- Inhibitory Concentration 50
- Malaria
- Metals
- Parasitic Sensitivity Tests
Dr. Castro's most frequent co-authors
Recent publications by Dr. Castro
AntimalarialsChloroquineMetals
AntimalarialsLife Cycle StagesMalaria
J Inorg Biochem
Antineoplastic AgentsCell Line, TumorCell Proliferation
See who Dr. Castro researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Castro works with, so you can find a warm path to the right family medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William Castro Jr. received $653 in industry payments from 2016 to 2024
CMS Open Payments shows 15 general payments to Dr. Castro from 8 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 94% of the total. Janssen Pharmaceuticals, Inc paid the most, $363.
General payments to Dr. Castro by program year, 2016 to 2024
General payments to Dr. Castro by kind, 2016 to 2024
$653in total
- Food and beverage$61694%
- Debt forgiveness$315%
- Education$61%
Companies that paid Dr. Castro the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. William Castro Jr.'s profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William Castro Jr.
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William Castro Jr.'s NPI number?
Dr. William Castro Jr.'s NPI number is 1366607848. It was assigned on July 23, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. William Castro Jr.?
Dr. William Castro Jr. is a family medicine physician in Huntington Beach, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. William Castro Jr. practice?
Dr. Castro practices at 8041 Newman Ave, Huntington Beach, CA 92647. Dr. Castro's primary practice is AltaMed Medical and Dental Group - Huntington Beach in Huntington Beach, California.
What is Dr. William Castro Jr.'s office phone number?
The practice phone on file for Dr. Castro is (714) 500-0224.
What is Dr. William Castro Jr.'s medical license number?
Dr. Castro holds California license A119270.
What drugs does Dr. William Castro Jr. prescribe most?
In 2024 Medicare Part D data, Dr. Castro's most prescribed drugs by claims were Atorvastatin Calcium, Ozempic and Losartan Potassium.
Has Dr. William Castro Jr. received payments from drug or device companies?
CMS Open Payments shows $653 in general payments to Dr. Castro from 8 companies from 2016 to 2024. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. William Castro Jr. been practicing?
Dr. Castro's NPI was assigned in 2008.
Does Dr. William Castro Jr. do research?
Dmand AI links 7 publications to Dr. Castro, published from 2010 to 2022.
Who does Dr. William Castro Jr. publish with?
Dr. Castro's most frequent co-authors are William G. Castro, MD (7 shared papers).
Selling to family medicine practices?
See family medicine physicians in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card