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

Marissa Oconnor

Individual provider Certified Registered Nurse Anesthetist · NPI 1497271662

Marissa Oconnor is registered under Certified Registered Nurse Anesthetist (CRNA) in Cambridge, Massachusetts. Graduated from Boston University School of Medicine in 2018, 8 years ago. Practices with Associated Physicians of Harvard Medical Faculty Physicians at Beth Is, a 558-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
8
Trained at
Boston University School of Medicine
Licensed in
MA
In the registry since
2017
Specialties on file
2
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Practice location Address checks out

330 Mount Auburn St
Cambridge, MA 02138-5597
Phone: (774) 253-5361
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 690 Canton St Ste 240, Westwood, MA 02090-2326 — (339) 204-9516

Specialties & licences

Certified Registered Nurse Anesthetist (primary) Taxonomy 367500000X · Licence RN2294239 (MA)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1497271662
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorNo
NPI enumeratedAugust 18, 2017
Last updated in NPPESNovember 7, 2025
Certification dateNovember 7, 2025

Medicare enrollment

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

Medicare specialtyCERTIFIED REGISTERED NURSE ANESTHETIST (CRNA)
Medical schoolBOSTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 2018 (8 years in practice)
Group practice Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is — 558 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 patients151
Services billed 154 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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 Associated Physicians of Harvard Medical Faculty Physicians at Beth Is

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 558 clinicians in the practice; 12 are shown here.

Other providers in Cambridge