Amy C. Trewella, MD
Family Medicine Physician · San Marcos, CA
Amy C. Trewella, MD is a family medicine physician with a practice address in San Marcos, California, and NPI 1376513119, issued on Jan 24, 2006. Check the license (California A99176, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Amy C. Trewella
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A99176 CA
Self-reported in NPPES; status is on the state search - Practice location
- 277 Rancheros Dr, San Marcos, CA 92069
- Phone
- (760) 291-6700
- Enumerated
- Jan 24, 2006
- Record last updated
- Aug 9, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (760) 471-0513
- Medicare enrollment
- Enrolled (PECOS I20120718000297); accepts Medicare assignment
- Medical or professional school
- Creighton University School Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 277 Rancheros Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alexis Adiarte, DPTPhysical Therapist1053625392
- Kendra Bartels, PMHNPPsychiatric/Mental Health Nurse Practitioner1922445915
- Victor Doroski, MDPsychiatry Physician1851330351
- Walter Ferris, LCSWClinical Social Worker1194765131
- Corinne Grandinetti, MFTMarriage & Family Therapist1740229244
- Trayce Hansen, PH.D.Clinical Psychologist1902099260
Verify Amy C. Trewella in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A99176Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average family medicine physician in 2024
55 Medicare Part D claims for 35 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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 2 group practices
- Arch Health Partners IncPoway, CA
- Cedars-Sinai Medical Care FoundationBeverly Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Amy C. Trewella among 17,133 family medicine physician records in California
Amy C. Trewella, MD is one of 17,133 family medicine physician records with a practice address in California. 81% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2005 · median 2005 among the 10,652 with a school on file
- Record last updated2012 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
47 family medicine physician records list a practice address in San Marcos
They are 47 of the 1,985 NPPES records with a practice address in San Marcos, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in San Marcos → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Wais Alemi, MDSan Marcos, CA 920691427305242
- Oksana Hirniak, D.O.San Marcos, CA 920691891750345
- Cheng Lee, M.D.San Marcos, CA 920691598098345
- Julie Matias, D.O.San Marcos, CA 920691083094510
- Kathryn McHenry, D.O.San Marcos, CA 920691326458373
- Devarshi Nath, MDSan Marcos, CA 920691275630618
- Peter Novota, M.D.San Marcos, CA 920691124132394
- Isela Penunuri, MDSan Marcos, CA 920691548295439
Common questions
What is Amy C. Trewella, MD's NPI number?
Amy C. Trewella, MD's National Provider Identifier (NPI) is 1376513119, issued on Jan 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Amy C. Trewella, MD located?
The NPPES record lists a practice address at 277 Rancheros Dr, San Marcos, CA, 92069. Phone: (760) 291-6700. Providers update this record themselves, so call before visiting.
How can I verify Amy C. Trewella, MD's license?
NPPES lists California license number A99176, 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 Amy C. Trewella, MD prescribe under Medicare Part D?
In 2024, Amy C. Trewella, MD had 55 Medicare Part D claims for 35 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.