Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Marianna Lucia Oppenheimer, MD, MSC

Individual provider Emergency Medicine Physician · NPI 1538657762

Marianna Lucia Oppenheimer, MD, MSC practises Emergency Medicine in Walnut Creek, California. Graduated from University of Puerto Rico School of Medicine in 2018, 8 years ago. Practices with Permanente Medical Group Inc, a 10,941-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in California and Ohio.

Years since qualifying
8
Trained at
University of Puerto Rico School of Medicine
Licensed in
CA, OH
In the registry since
2018
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1425 S Main St
Walnut Creek, CA 94596-5318
Phone: (925) 295-4000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 759 Chestnut St, Springfield, MA 01199-1001 — (413) 794-0000
  • 759 Chestnut St, Springfield, MA 01199-1001 — (413) 794-0000
  • 395 W 12th Ave Rm 662, Columbus, OH 43210 — (614) 293-8000

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence A193240 (CA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 35.140450 (OH)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1538657762
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD , MSC
Sole proprietorNo
NPI enumeratedApril 24, 2018
Last updated in NPPESAugust 12, 2024
Certification dateAugust 12, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF PUERTO RICO SCHOOL OF MEDICINE
Graduated 2018 (8 years in practice)
Group practice Permanente Medical Group Inc — 10941 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients15
Services billed 16 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Permanente Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 10941 clinicians in the practice; 12 are shown here.

Other providers in Walnut Creek