Sheila Marie Adaya Adan, D.O.
Family Medicine Physician · Ontario, CA
Sheila Marie Adaya Adan, D.O. is a family medicine physician with a practice address in Ontario, California, and NPI 1912272733, issued on Mar 12, 2012. Check the license (California 20A12266, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Sheila Marie Adaya Adan
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A12266 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2295 S Vineyard Ave, Ontario, CA 91761
- Phone
- (909) 724-5000
- Enumerated
- Mar 12, 2012
- Record last updated
- Dec 23, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (909) 724-2526
- Medicare enrollment
- Enrolled (PECOS I20130314000110); accepts Medicare assignment
- Medical or professional school
- College Of Osteo Med Of The Pacific At Pomona, 2010
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 2295 S Vineyard Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ana Mae Abaya, NPFamily Nurse Practitioner1255164943
- Anna Alley, CRNACertified Registered Nurse Anesthetist1518399732
- Hye Hyun An, PHARMDPharmacist1578428470
- Leonila Araneta, LCSWClinical Social Worker1861771974
- Fernando AvilaFamily Medicine Physician1396364147
- Heather Bernhardt-Nevarez, LCSWClinical Social Worker1689177735
Verify Sheila Marie Adaya Adan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A12266Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
39% more Medicare Part D claims than the average family medicine physician in 2024
4,939 Medicare Part D claims for 667 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 265 claims were for opioids.
Most prescribed
- Atorvastatin Calcium366 claims
- Lisinopril206 claims
- Amlodipine Besylate195 claims
- Losartan Potassium184 claims
- Levothyroxine Sodium173 claims
- Hydrocodone-Acetaminophen143 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
- Southern California Permanente Medical GroupRiverside, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sheila Marie Adaya Adan among 17,133 family medicine physician records in California
Sheila Marie Adaya Adan, D.O. 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
- Graduated2010 · median 2005 among the 10,652 with a school on file
- Record last updated2021 · 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 Ontario → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Fernando AvilaOntario, CA 917611396364147
- Judith Cabrera, MDOntario, CA 917611710202734
- Teodoro Diaz, DOOntario, CA 917611437190113
- David Diep, DOOntario, CA 917611750651485
- Michaella Gaite, DOOntario, CA 917611154999522
- Kenneth Lee, M.D.Ontario, CA 917611750826863
- Andrelee Taganas, M.D.Ontario, CA 917611013171230
- Daniel TannousOntario, CA 917611508493040
Common questions
What is Sheila Marie Adaya Adan, D.O.'s NPI number?
Sheila Marie Adaya Adan, D.O.'s National Provider Identifier (NPI) is 1912272733, issued on Mar 12, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Sheila Marie Adaya Adan, D.O. located?
The NPPES record lists a practice address at 2295 S Vineyard Ave, Ontario, CA, 91761. Phone: (909) 724-5000. Providers update this record themselves, so call before visiting.
How can I verify Sheila Marie Adaya Adan, D.O.'s license?
NPPES lists California license number 20A12266, 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 Sheila Marie Adaya Adan, D.O. prescribe under Medicare Part D?
In 2024, Sheila Marie Adaya Adan, D.O. had 4,939 Medicare Part D claims for 667 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.