Karisa Thayer, M.D.
Internal Medicine Physician · Gardena, CA
Karisa Thayer, M.D. is an internal medicine physician with a practice address in Gardena, California, and NPI 1558765941, issued on Oct 14, 2014. Check the license (California A140754, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karisa Thayer
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A140754 CA
Self-reported in NPPES; status is on the state search - Practice location
- 742 W Gardena Blvd, Gardena, CA 90247
- Phone
- (310) 327-1357
- Enumerated
- Oct 14, 2014
- Record last updated
- Nov 17, 2022
- Medicaid ID
- KA3232267556). CA
- Medicare enrollment
- Enrolled (PECOS I20240625003313); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 2014
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 742 W Gardena Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kelsey BreigFamily Nurse Practitioner1578076055
- Ametra BroomePhysician Assistant1992931729
- Chyron Davis, PAMedical Physician Assistant1750498846
- Yeymi De Leon, MDFamily Medicine Physician1831320852
- Gail Gabourel, MSPA-CInternal Medicine Physician1194946376
- Katelyn KleinInternal Medicine Physician1336600261
Verify Karisa Thayer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A140754Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average internal medicine physician in 2024
516 Medicare Part D claims for 91 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium62 claims
- Amlodipine Besylate41 claims
- Metformin Hcl25 claims
- Hydrochlorothiazide23 claims
- Jardiance18 claims
- Lisinopril16 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
- Centro DE Salud DE LA Comunidad DE San Ysidro, Inc.National City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karisa Thayer among 17,696 internal medicine physician records in California
Karisa Thayer, M.D. 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 2014, is newer than 74% of them.
- NPI issued2014 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2014 · median 2004 among the 11,065 with a school on file
- Record last updated2022 · 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 Gardena → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Siar Basharmal, M.D.Gardena, CA 902471639168099
- Keith Andrew Ebilane, M.D.Gardena, CA 902471225370679
- Kimberly Eddings-Reece, MDGardena, CA 902471073513925
- Gail Gabourel, MSPA-CGardena, CA 902471194946376
- Soumya Kambalapalli, MDGardena, CA 902471558935908
- Katelyn KleinGardena, CA 902471336600261
- Owen Robinson, M.D.Gardena, CA 902471447246806
- Pranit Shrestha, M.D., M.P.H.Gardena, CA 902471164839775
Common questions
What is Karisa Thayer, M.D.'s NPI number?
Karisa Thayer, M.D.'s National Provider Identifier (NPI) is 1558765941, issued on Oct 14, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Karisa Thayer, M.D. located?
The NPPES record lists a practice address at 742 W Gardena Blvd, Gardena, CA, 90247. Phone: (310) 327-1357. Providers update this record themselves, so call before visiting.
How can I verify Karisa Thayer, M.D.'s license?
NPPES lists California license number A140754, 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 Karisa Thayer, M.D. prescribe under Medicare Part D?
In 2024, Karisa Thayer, M.D. had 516 Medicare Part D claims for 91 beneficiaries; 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.