Alexander Nguyen Castillo, MD
Internal Medicine Physician · Henderson, NV
Alexander Nguyen Castillo, MD is an internal medicine physician with a practice address in Henderson, Nevada, and NPI 1164059226, issued on Mar 26, 2020. Check the license (Nevada 24010, as entered in NPPES) on the Nevada State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Alexander Nguyen Castillo
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 24010 NV
Self-reported in NPPES; status is on the state search - Practice location
- 10624 S Eastern Ave # A955, Henderson, NV 89052
- Phone
- (702) 800-5393
- Enumerated
- Mar 26, 2020
- Record last updated
- Jul 17, 2023
- Fax
- (702) 407-7016
- Medicare enrollment
- Enrolled (PECOS I20230803000691); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,229 in Nevada → Look up another NPI →
Also registered at 10624 S Eastern Ave # A955
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Alexander Nguyen Castillo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNevada State Board of Medical Examiners
Search for license 24010Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average internal medicine physician in 2024
352 Medicare Part D claims for 98 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium17 claims
- Lisinopril16 claims
- Levothyroxine Sodium14 claims
- Amlodipine Besylate12 claims
- Losartan Potassium12 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 58.9 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $624.55
18 payments; by number, the most common kind was food and beverage; the largest payer was Bayer Healthcare Pharmaceuticals 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.
Alexander Nguyen Castillo among 1,229 internal medicine physician records in Nevada
Alexander Nguyen Castillo, MD is one of 1,229 internal medicine physician records with a practice address in Nevada. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 84% of them.
- NPI issued2020 · 84% of these records are older, 12% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2020 · median 2006 among the 772 with a school on file
- Record last updated2023 · 43% 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 Nevada practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
181 internal medicine physician records list a practice address in Henderson
They are 181 of the 7,490 NPPES records with a practice address in Henderson, and 1,229 internal medicine physician records in Nevada.
All 1,229 in Nevada → Every provider in Henderson → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Hossein Akhondi Asl, M.D.Henderson, NV 890521609862051
- Poupak Bigger, M.D.Henderson, NV 890521023010782
- Victor Bonuel, MDHenderson, NV 890521801869862
- Hugh Burt, M.D.Henderson, NV 890521972599371
- Pio Clavecilla, MDHenderson, NV 890521659349140
- Guillermo Fraga, MDHenderson, NV 890521104809433
- Robert Gong, M.D.Henderson, NV 890521265409601
- Witold Iglikowski, M.D.Henderson, NV 890521164412680
Common questions
What is Alexander Nguyen Castillo, MD's NPI number?
Alexander Nguyen Castillo, MD's National Provider Identifier (NPI) is 1164059226, issued on Mar 26, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Alexander Nguyen Castillo, MD located?
The NPPES record lists a practice address at 10624 S Eastern Ave # A955, Henderson, NV, 89052. Phone: (702) 800-5393. Providers update this record themselves, so call before visiting.
How can I verify Alexander Nguyen Castillo, MD's license?
NPPES lists Nevada license number 24010, as entered by the provider. Search the Nevada State Board of Medical Examiners at https://medboard.nv.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alexander Nguyen Castillo, MD prescribe under Medicare Part D?
In 2024, Alexander Nguyen Castillo, MD had 352 Medicare Part D claims for 98 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Alexander Nguyen Castillo, MD's MIPS final score?
The 2023 MIPS final score is 58.9 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.