Isabel Christina Tejeda, M.D.
Adult Medicine Physician · Union City, CA
Isabel Christina Tejeda, M.D. is an adult medicine physician with a practice address in Union City, California, and NPI 1326181165, issued on Feb 14, 2007. Check the license (California A88853, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Isabel Christina Tejeda
- Credential
- M.D.
- Primary taxonomy
- Adult Medicine Physician 207QA0505X
- License number
- A88853 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3553 Whipple RD, Union City, CA 94587
- Phone
- (510) 675-4668
- Enumerated
- Feb 14, 2007
- Record last updated
- Dec 9, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (510) 675-2154
- Medicare enrollment
- Enrolled (PECOS I20070412000554); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest adult medicine physician records → All 386 in California → Look up another NPI →
Also registered at 3553 Whipple RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Isabel Christina Tejeda in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A88853Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
29% more Medicare Part D claims than the average adult medicine physician in 2024
3,866 Medicare Part D claims for 455 beneficiaries, against an average of 3,002 among the 1,307 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 73 claims were for opioids.
Most prescribed
- Atorvastatin Calcium327 claims
- Amlodipine Besylate179 claims
- Lisinopril179 claims
- Levothyroxine Sodium146 claims
- Famotidine131 claims
- Losartan Potassium123 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
- Permanente Medical Group IncStockton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Isabel Christina Tejeda among 386 adult medicine physician records in California
Isabel Christina Tejeda, M.D. is one of 386 adult medicine physician records with a practice address in California. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 35% of them.
- NPI issued2007 · 35% of these records are older, 49% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 48% of these records are
- Graduated2002 · median 2005 among the 187 with a school on file
- Record last updated2021 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QA0505X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Adult Medicine Physician providers in California
There are 386 adult medicine physician records in California.
All 386 in California → Every provider in Union City → Adult Medicine Physician nationwide →
The 8 adult medicine physician records with the nearest ZIP codes
- Marie Agleham, MDUnion City, CA 945871649298209
- Bryan Anker, MDUnion City, CA 945871265926422
- Anthony Noces, MDVallejo, CA 945891801425467
- Kalpana Rao, M.D.Vallejo, CA 945891184651234
- Laurena Dongmo FotsingVallejo, CA 945901003433699
- Peter Navolanic, M.D.Vallejo, CA 945901427121896
- Paige Yoshisato, M.D.Vallejo, CA 945911770586802
- Chanatip Suksang, M.D.Walnut Creek, CA 945951497977102
Common questions
What is Isabel Christina Tejeda, M.D.'s NPI number?
Isabel Christina Tejeda, M.D.'s National Provider Identifier (NPI) is 1326181165, issued on Feb 14, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Isabel Christina Tejeda, M.D. located?
The NPPES record lists a practice address at 3553 Whipple RD, Union City, CA, 94587. Phone: (510) 675-4668. Providers update this record themselves, so call before visiting.
How can I verify Isabel Christina Tejeda, M.D.'s license?
NPPES lists California license number A88853, 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 Isabel Christina Tejeda, M.D. prescribe under Medicare Part D?
In 2024, Isabel Christina Tejeda, M.D. had 3,866 Medicare Part D claims for 455 beneficiaries; the average among adult medicine physician prescribers was 3,002. 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.