DR. KAREN LEE OPPENHEIMER M.D.
NPI 1164430443
Internal Medicine in Torrance, CA
About Dr. Karen Lee Oppenheimer M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KAREN LEE OPPENHEIMER M.D. (NPI 1164430443) is an individual internal medicine provider in Torrance, California, licensed in California (AO65288) and active in the NPI registry since August 2006. She is enrolled in Medicare PECOS and is a graduate of Icahn School Of Medicine At Mount Sinai (1996).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Karen Lee Oppenheimer M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Karen Oppenheimer reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Harbor City, CA 90710
- Reassigned Medicare billing, California enrollment
- 13,921 clinicians in this Medicare group
Salem, OR 97317
- Reassigned Medicare billing, Oregon and Washington enrollments
- Medicare enrollment name: Kaiser Foundation Health Plan Of The Northwest
- Also billed through NPI 1871848457 (Washington)
- 3,207 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90503 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 12
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
TORRANCE, CA 90503
TORRANCE, CA 90503
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Karen Oppenheimer's NPI number?
The NPI number for Karen Oppenheimer is 1164430443. It was assigned to this individual provider in the NPPES registry on August 3, 2006.
Where is Karen Oppenheimer located?
Karen Oppenheimer practices at 20790 Madrona Ave, Torrance, CA 90503. The listed phone number is (310) 312-2831.
What is Karen Oppenheimer's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Karen Oppenheimer enrolled in Medicare?
Yes. Karen Oppenheimer is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Karen Oppenheimer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Oppenheimer reassigns Medicare benefits to 2 organizations: Southern California Permanente Medical Group (Harbor City, CA) and South Salem Rehabilitation, LLC (Salem, OR). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Karen Oppenheimer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Karen Oppenheimer accept?
Health plans from Kaiser Permanente list Karen Oppenheimer as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Karen Oppenheimer was last updated on December 1, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Karen Lee Oppenheimer, M.D. · NPI 1164430443
Internal Medicine physician in Torrance, California. Individual provider, active in the CMS NPPES registry since August 3, 2006.
## Identity
- **NPI:** 1164430443 (Entity type: Individual)
- **Enumerated:** August 3, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** AO65288 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 20790 MADRONA AVE, Torrance, CA 90503-3777
- **Phone:** (310) 312-2831
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Southern California Permanente Medical Group (NPI 1598797011, Harbor City, CA); South Salem Rehabilitation, LLC (NPI 1215071998, Salem, OR) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Icahn School Of Medicine At Mount Sinai, class of 1996
## Record status
- **NPPES last updated:** December 1, 2021
- **Other identifiers:** Other P00411272 (OR); Medicaid 213267 (OR)
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Source: [NPI Profile](https://npiprofile.com/npi/1164430443) · Data from the CMS NPPES public registry.