Maria R. Santos-Montemayor, MD
Internal Medicine Physician · Arcadia, CA
Maria R. Santos-Montemayor, MD is an internal medicine physician with a practice address in Arcadia, California, and NPI 1316974397, issued on Jun 27, 2006. Check the license (California A79424, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Maria R. Santos-Montemayor
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A79424 CA
042995 CT
Self-reported in NPPES; status is on the state search - Practice location
- 450 E Huntington Dr, Arcadia, CA 91006
- Phone
- (626) 462-1884
- Enumerated
- Jun 27, 2006
- Record last updated
- Jan 9, 2026
- Medicare enrollment
- Enrolled (PECOS I20060828000554); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 450 E Huntington Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Yehuda Berenson, MDInternal Medicine Physician1366402711
- Mariam Botros, DPMFoot & Ankle Surgery Podiatrist1619328457
- Mary Cao, FNP-BCFamily Nurse Practitioner1568200665
Verify Maria R. Santos-Montemayor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A79424Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average internal medicine physician in 2024
8,436 Medicare Part D claims for 668 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 197 claims were for opioids.
Most prescribed
- Amlodipine Besylate525 claims
- Atorvastatin Calcium450 claims
- Rosuvastatin Calcium328 claims
- Lisinopril324 claims
- Losartan Potassium300 claims
- Levothyroxine Sodium289 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.
Bills Medicare through one group practice
- Healthcare Partners Affiliates Medical GroupArcadia, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Maria R. Santos-Montemayor among 17,696 internal medicine physician records in California
Maria R. Santos-Montemayor, 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 fileYes · 63% of these records are
- Graduated1989 · median 2004 among the 11,065 with a school on file
- 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).
74 internal medicine physician records list a practice address in Arcadia
They are 74 of the 2,033 NPPES records with a practice address in Arcadia, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Arcadia → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Yehuda Berenson, MDArcadia, CA 910061366402711
- Beverly Botnick, MDArcadia, CA 910061790754455
- Christine Castano, MDArcadia, CA 910061225076268
- Wen-Che Chung, MDArcadia, CA 910061891754149
- Zewdu Gebreyes, M.D.Arcadia, CA 910061366419541
- Renato Labog, M.DArcadia, CA 910061427011204
- Scott Liang, MDArcadia, CA 910061639124514
- Haig Manjikian, M.D.Arcadia, CA 910061093783813
Common questions
What is Maria R. Santos-Montemayor, MD's NPI number?
Maria R. Santos-Montemayor, MD's National Provider Identifier (NPI) is 1316974397, issued on Jun 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Maria R. Santos-Montemayor, MD located?
The NPPES record lists a practice address at 450 E Huntington Dr, Arcadia, CA, 91006. Phone: (626) 462-1884. Providers update this record themselves, so call before visiting.
How can I verify Maria R. Santos-Montemayor, MD's license?
NPPES lists California license number A79424, 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 Maria R. Santos-Montemayor, MD prescribe under Medicare Part D?
In 2024, Maria R. Santos-Montemayor, MD had 8,436 Medicare Part D claims for 668 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.