Karen Lee Oppenheimer, M.D.
Internal Medicine Physician · Torrance, CA
Karen Lee Oppenheimer, M.D. is an internal medicine physician with a practice address in Torrance, California, and NPI 1164430443, issued on Aug 3, 2006. Check the license (California AO65288, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karen Lee Oppenheimer
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- AO65288 CA
MD25727 OR
Self-reported in NPPES; status is on the state search - Practice location
- 20790 Madrona Ave, Torrance, CA 90503
- Phone
- (310) 312-2831
- Enumerated
- Aug 3, 2006
- Record last updated
- Dec 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 213267 OR
- Medicare enrollment
- Enrolled (PECOS I20141014001902); accepts Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 1996
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 20790 Madrona Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Blake Chin-LeeFamily Medicine Physician1902171366
- Sarah Fong, D.O.Family Medicine Physician1205064268
- Wakana FujiwaraPediatrics Physician1891322798
- Eduardo Godoy, MDFamily Medicine Physician1659305852
- Matthew GualeniStudent in an Organized Health Care Education/Training Program1518754134
- Ricardo Jimenez-Kimble, MDFamily Medicine Physician1194985200
Verify Karen Lee Oppenheimer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license AO65288Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
61% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,250 Medicare Part D claims for 285 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 30 claims were for opioids.
Most prescribed
- Atorvastatin Calcium77 claims
- Levothyroxine Sodium66 claims
- Amlodipine Besylate65 claims
- Rosuvastatin Calcium44 claims
- Losartan Potassium40 claims
- Lisinopril36 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
- Kaiser Foundation Health Plan OF The NorthwestVancouver, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen Lee Oppenheimer among 17,696 internal medicine physician records in California
Karen Lee Oppenheimer, 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 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 fileYes · 63% of these records are
- Graduated1996 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
231 internal medicine physician records list a practice address in Torrance
They are 231 of the 8,901 NPPES records with a practice address in Torrance, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Torrance → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Bahman Bandari, MDTorrance, CA 905031083615298
- Rudo Benjamin, MDTorrance, CA 905031295736676
- Saroj Bharatiya, M.D.Torrance, CA 905031396727319
- Princess Gladys Bordador, M.D.Torrance, CA 905031952366304
- Michael Borovay, M.D.Torrance, CA 905031174575476
- Carl Feld, MDTorrance, CA 905031205837697
- Gulzar Fidai, MDTorrance, CA 905031851398218
- Kalpana Hool, M.D.Torrance, CA 905031629043799
Common questions
What is Karen Lee Oppenheimer, M.D.'s NPI number?
Karen Lee Oppenheimer, M.D.'s National Provider Identifier (NPI) is 1164430443, issued on Aug 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karen Lee Oppenheimer, M.D. located?
The NPPES record lists a practice address at 20790 Madrona Ave, Torrance, CA, 90503. Phone: (310) 312-2831. Providers update this record themselves, so call before visiting.
How can I verify Karen Lee Oppenheimer, M.D.'s license?
NPPES lists California license number AO65288, 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 Karen Lee Oppenheimer, M.D. prescribe under Medicare Part D?
In 2024, Karen Lee Oppenheimer, M.D. had 1,250 Medicare Part D claims for 285 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.