Marie K. Yamamotoya, MD
Family Medicine Physician · Fairfield, CA
Marie K. Yamamotoya, MD is a family medicine physician with a practice address in Fairfield, California, and NPI 1487732111, issued on Nov 1, 2006. Check the license (California A61112, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Marie K. Yamamotoya
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A61112 CA
Self-reported in NPPES; status is on the state search - Practice location
- 470 Chadbourne RD Ste A, Fairfield, CA 94534
- Phone
- (707) 419-8989
- Enumerated
- Nov 1, 2006
- Record last updated
- Jan 29, 2025
- Medicaid ID
- 00A611120 CA
- Medicare enrollment
- Enrolled (PECOS I20140721001985); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 470 Chadbourne RD Ste A
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mara Adelman, PHYSICIANS ASST PAPhysician Assistant1124053483
- Wanda Avila, ASWClinical Social Worker1811694599
- Renee BassettClinical Social Worker1124623236
- Janina Mae Bernas, RDRegistered Dietitian1811465800
- Jason Booth, MDFamily Medicine Physician1215236443
- Yvette BravoSocial Worker1881042547
Verify Marie K. Yamamotoya in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A61112Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% fewer Medicare Part D claims than the average family medicine physician in 2024
2,383 Medicare Part D claims for 320 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium314 claims
- Amlodipine Besylate227 claims
- Levothyroxine Sodium141 claims
- Losartan Potassium122 claims
- Metoprolol Succinate107 claims
- Lisinopril83 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
- American Indian Health And Services CorporationSanta Barbara, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marie K. Yamamotoya among 17,133 family medicine physician records in California
Marie K. Yamamotoya, 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
- Graduated1995 · median 2005 among the 10,652 with a school on file
- Record last updated2025 · 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).
67 family medicine physician records list a practice address in Fairfield
They are 67 of the 3,595 NPPES records with a practice address in Fairfield, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Fairfield → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Jason Booth, MDFairfield, CA 945341215236443
- Daniel Ferrick, M.D.Fairfield, CA 945341942397260
- Vanessa Franco, MDFairfield, CA 945341255481305
- Douglas Freeman, M.D.Fairfield, CA 945341588760110
- Ehsan Ghods, D.O.Fairfield, CA 945341386663508
- Bryan Holcomb, MDFairfield, CA 945341366523516
- Alina Hongsakaphadana, M.D.Fairfield, CA 945341740304237
- Kelse McKinley, M.D.Fairfield, CA 945341649433178
Common questions
What is Marie K. Yamamotoya, MD's NPI number?
Marie K. Yamamotoya, MD's National Provider Identifier (NPI) is 1487732111, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marie K. Yamamotoya, MD located?
The NPPES record lists a practice address at 470 Chadbourne RD Ste A, Fairfield, CA, 94534. Phone: (707) 419-8989. Providers update this record themselves, so call before visiting.
How can I verify Marie K. Yamamotoya, MD's license?
NPPES lists California license number A61112, 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 Marie K. Yamamotoya, MD prescribe under Medicare Part D?
In 2024, Marie K. Yamamotoya, MD had 2,383 Medicare Part D claims for 320 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.