Lauren Jefferis, MD
Internal Medicine Physician · San Marcos, CA
Lauren Jefferis, MD is an internal medicine physician with a practice address in San Marcos, California, and NPI 1346354776, issued on Aug 19, 2006. Check the license (California A80674, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Lauren Jefferis
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A80674 CA
Self-reported in NPPES; status is on the state search - Practice location
- 150 Valpreda RD, San Marcos, CA 92069
- Phone
- (760) 736-6700
- Enumerated
- Aug 19, 2006
- Record last updated
- Feb 27, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (760) 736-6782
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 150 Valpreda RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Lauren Jefferis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A80674Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
36 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
Lauren Jefferis among 17,696 internal medicine physician records in California
Lauren Jefferis, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2008 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in California
There are 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Marcos → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Shreya Chandra, MDSan Marcos, CA 920691972519825
- Samuel Poniachik, M.DSan Marcos, CA 920691467485078
- Marie Russell, MD.San Marcos, CA 920691609947449
- Arturo Tolentino, M.D.San Marcos, CA 920691609066018
- Izabela Witczak, M.DSan Marcos, CA 920691184735201
- Abbas Ali, M.DSantee, CA 920711104200112
- Azzah Arikat, MDSantee, CA 920711184971640
- David Corbin, MDSantee, CA 920711275627200
Common questions
What is Lauren Jefferis, MD's NPI number?
Lauren Jefferis, MD's National Provider Identifier (NPI) is 1346354776, issued on Aug 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Lauren Jefferis, MD located?
The NPPES record lists a practice address at 150 Valpreda RD, San Marcos, CA, 92069. Phone: (760) 736-6700. Providers update this record themselves, so call before visiting.
How can I verify Lauren Jefferis, MD's license?
NPPES lists California license number A80674, 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 Lauren Jefferis, MD prescribe under Medicare Part D?
In 2024, Lauren Jefferis, MD had 36 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.