Cynthia L. Sierra, MD
Family Medicine Physician · Chula Vista, CA
Cynthia L. Sierra, MD is a family medicine physician with a practice address in Chula Vista, California, and NPI 1437252905, issued on Sep 7, 2006. Check the license (California A93042, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cynthia L. Sierra
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A93042 CA
Self-reported in NPPES; status is on the state search - Practice location
- 865 3RD Ave, Chula Vista, CA 91911
- Phone
- (619) 498-6200
- Enumerated
- Sep 7, 2006
- Record last updated
- Dec 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (619) 427-0134
- Medicare enrollment
- Enrolled (PECOS I20060328000438); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 2004
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 865 3RD Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Vivencio Abante, DDSGeneral Practice Dentistry1336277748
- Rosa Maria Arias, MDPediatrics Physician1568433779
- Miguel Cordoba, MDPediatrics Physician1053382176
- Myrna Coronado, MDAdult Medicine Physician1710147566
- Violeta Curbelo, MDPediatrics Physician1679544878
- Malachi De Leon-LopezBehavior Analyst1134892896
Verify Cynthia L. Sierra in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A93042Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average family medicine physician in 2024
7,604 Medicare Part D claims for 998 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 380 claims were for opioids.
Most prescribed
- Atorvastatin Calcium471 claims
- Levothyroxine Sodium290 claims
- Losartan Potassium276 claims
- Amlodipine Besylate264 claims
- Metformin Hcl240 claims
- Rosuvastatin Calcium226 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 GroupBonita, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cynthia L. Sierra among 17,133 family medicine physician records in California
Cynthia L. Sierra, 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
- Graduated2004 · 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).
119 family medicine physician records list a practice address in Chula Vista
They are 119 of the 5,329 NPPES records with a practice address in Chula Vista, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Chula Vista → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Carl Battles, M.D.Chula Vista, CA 919111447344460
- Avelino Canlas, MDChula Vista, CA 919111275682528
- David Chang, M.D.Chula Vista, CA 919111386628980
- Maribel Flores, MDChula Vista, CA 919111124104815
- Pamela Kenney, M.D.Chula Vista, CA 919111508836289
- Martin Linder, M.D.Chula Vista, CA 919111801874797
- Marianne McKennett, MDChula Vista, CA 919111376639666
- Tracy Polanco, M.D.Chula Vista, CA 919111538138631
Common questions
What is Cynthia L. Sierra, MD's NPI number?
Cynthia L. Sierra, MD's National Provider Identifier (NPI) is 1437252905, issued on Sep 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Cynthia L. Sierra, MD located?
The NPPES record lists a practice address at 865 3RD Ave, Chula Vista, CA, 91911. Phone: (619) 498-6200. Providers update this record themselves, so call before visiting.
How can I verify Cynthia L. Sierra, MD's license?
NPPES lists California license number A93042, 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 Cynthia L. Sierra, MD prescribe under Medicare Part D?
In 2024, Cynthia L. Sierra, MD had 7,604 Medicare Part D claims for 998 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.