Ronald Castillo Tejada, MD
Internal Medicine Physician · Lakewood, CA
Ronald Castillo Tejada, MD is an internal medicine physician with a practice address in Lakewood, California, and NPI 1407165079, issued on Sep 30, 2010. Check the license (California A118334, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ronald Castillo Tejada
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A118334 CA
036130801 IL
Self-reported in NPPES; status is on the state search - Practice location
- 3300 E South St, Lakewood, CA 90805
- Phone
- (562) 531-0377
- Enumerated
- Sep 30, 2010
- Record last updated
- Oct 1, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (562) 531-1724
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 3300 E South St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ronald Castillo Tejada in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A118334Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average internal medicine physician in 2024
424 Medicare Part D claims for 152 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 18 claims were for opioids.
Most prescribed
- Pantoprazole Sodium39 claims
- Amlodipine Besylate22 claims
- Clopidogrel20 claims
- Tamsulosin Hcl20 claims
- Atorvastatin Calcium19 claims
- Eliquis19 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: $169.05
1 payment: food and beverage; the largest payer was CVRx, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Ronald Castillo Tejada among 17,696 internal medicine physician records in California
Ronald Castillo Tejada, MD 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 2010, is newer than 63% of them.
- NPI issued2010 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2012 · 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).
23 internal medicine physician records list a practice address in Lakewood
They are 23 of the 1,204 NPPES records with a practice address in Lakewood, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Lakewood → Internal Medicine Physician nationwide →
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Common questions
What is Ronald Castillo Tejada, MD's NPI number?
Ronald Castillo Tejada, MD's National Provider Identifier (NPI) is 1407165079, issued on Sep 30, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Ronald Castillo Tejada, MD located?
The NPPES record lists a practice address at 3300 E South St, Lakewood, CA, 90805. Phone: (562) 531-0377. Providers update this record themselves, so call before visiting.
How can I verify Ronald Castillo Tejada, MD's license?
NPPES lists California license number A118334, 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 Ronald Castillo Tejada, MD prescribe under Medicare Part D?
In 2024, Ronald Castillo Tejada, MD had 424 Medicare Part D claims for 152 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.