Ken Makio Marriner, M.D.
Family Medicine Physician · Oakland, CA
Ken Makio Marriner, M.D. is a family medicine physician with a practice address in Oakland, California, and NPI 1013264126, issued on Aug 8, 2012. Check the license (California A128587, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ken Makio Marriner
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A128587 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3451 E 12TH St, Oakland, CA 94601
- Phone
- (510) 535-3500
- Enumerated
- Aug 8, 2012
- Record last updated
- Jul 21, 2022
- Fax
- (510) 535-7863
- Medicare enrollment
- Enrolled (PECOS I20180803001510); accepts Medicare assignment
- Medical or professional school
- State University Of New York Downstate Medical Center, 2012
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 3451 E 12TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Patricia ArteagaRegistered Nurse1619323870
- Melissa Ayres, MPH, RDNRegistered Dietitian1144067067
- Lidia Barajas Gonzalez, RNRegistered Nurse1780130450
- Paul Bayard, MDFamily Medicine Physician1922101237
- Shelli Bein, MDPediatrics Physician1982836078
- Julia Bley, MDObstetrics & Gynecology Physician1831357177
Verify Ken Makio Marriner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A128587Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% fewer Medicare Part D claims than the average family medicine physician in 2024
2,838 Medicare Part D claims for 219 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 95 claims were for opioids.
Most prescribed
- Atorvastatin Calcium213 claims
- Metformin Hcl183 claims
- Amlodipine Besylate124 claims
- Jardiance122 claims
- Losartan Potassium93 claims
- Hydrocodone-Acetaminophen81 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
- LA Clinica DE LA Raza IncOakland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ken Makio Marriner among 17,133 family medicine physician records in California
Ken Makio Marriner, M.D. 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 2012, is newer than 66% of them.
- NPI issued2012 · 66% of these records are older, 32% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2012 · median 2005 among the 10,652 with a school on file
- Record last updated2022 · 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).
Family Medicine Physician providers in California
There are 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Oakland → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Paul Bayard, MDOakland, CA 946011922101237
- Barbara Benzwi, MDOakland, CA 946011063512317
- Jaime Cortes, MDOakland, CA 946011265587778
- Asano Fertig, MDOakland, CA 946011013017268
- Christine Fratino, DOOakland, CA 946011841398542
- Thomas Halligan, MDOakland, CA 946011457454761
- Irene Kelly, MDOakland, CA 946011386747509
- Jill LeggOakland, CA 946011881771624
Common questions
What is Ken Makio Marriner, M.D.'s NPI number?
Ken Makio Marriner, M.D.'s National Provider Identifier (NPI) is 1013264126, issued on Aug 8, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Ken Makio Marriner, M.D. located?
The NPPES record lists a practice address at 3451 E 12TH St, Oakland, CA, 94601. Phone: (510) 535-3500. Providers update this record themselves, so call before visiting.
How can I verify Ken Makio Marriner, M.D.'s license?
NPPES lists California license number A128587, 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 Ken Makio Marriner, M.D. prescribe under Medicare Part D?
In 2024, Ken Makio Marriner, M.D. had 2,838 Medicare Part D claims for 219 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.