Romeo Aidana Castillo, MD
Internal Medicine Physician · Huntington Park, CA
Romeo Aidana Castillo, MD is an internal medicine physician with a practice address in Huntington Park, California, and NPI 1659345403, issued on Feb 16, 2006. Check the license (California A49358, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Romeo Aidana Castillo
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A49358 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2675 E Slauson Ave, Huntington Park, CA 90255
- Phone
- (323) 589-6681
- Enumerated
- Feb 16, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (323) 584-2505
- Medicaid ID
- GR0040370 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 2675 E Slauson Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Romeo Aidana Castillo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A49358Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,652 Medicare Part D claims for 193 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Metformin Hcl168 claims
- Pravastatin Sodium155 claims
- Atorvastatin Calcium139 claims
- Losartan Potassium133 claims
- Amlodipine Besylate126 claims
- Famotidine107 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: $1,433.84
5 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie 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.
Romeo Aidana Castillo among 17,696 internal medicine physician records in California
Romeo Aidana Castillo, 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2026 · 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).
14 internal medicine physician records list a practice address in Huntington Park
They are 14 of the 1,056 NPPES records with a practice address in Huntington Park, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Huntington Park → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Alberto Alonso, M.D.Huntington Park, CA 902551669621058
- Laura Castro Castrezana, MDHuntington Park, CA 902551134832108
- Robert Cons, MDHuntington Park, CA 902551346306958
- Daniela Drake, M.D.Huntington Park, CA 902551922134907
- Timoty Gonzalez, M.D.Huntington Park, CA 902551982647319
- Thi Htway, M.D.Huntington Park, CA 902551144595190
- Rebecca Kuhn, MDHuntington Park, CA 902551316965429
- Albert LeeHuntington Park, CA 902551639527161
Common questions
What is Romeo Aidana Castillo, MD's NPI number?
Romeo Aidana Castillo, MD's National Provider Identifier (NPI) is 1659345403, issued on Feb 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Romeo Aidana Castillo, MD located?
The NPPES record lists a practice address at 2675 E Slauson Ave, Huntington Park, CA, 90255. Phone: (323) 589-6681. Providers update this record themselves, so call before visiting.
How can I verify Romeo Aidana Castillo, MD's license?
NPPES lists California license number A49358, 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 Romeo Aidana Castillo, MD prescribe under Medicare Part D?
In 2024, Romeo Aidana Castillo, MD had 2,652 Medicare Part D claims for 193 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.