Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Michael Nicholas Papanicolaou, MD

Individual provider Cardiovascular Disease Physician · NPI 1922038967

Dr. Michael Nicholas Papanicolaou, MD is registered under Cardiovascular Disease (Cardiology) in Thousand Oaks, California. Graduated from Duke University School of Medicine in 1985, 41 years ago. Practices with Heart Center Cardiology, a 2-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
41
Trained at
Duke University School of Medicine
Licensed in
CA
In the registry since
2006
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

1000 Newbury Rd Ste 180
Thousand Oaks, CA 91320-6435 Not confirmed with CMS for 14 years — call before visiting
Phone: (805) 480-2600
Fax: (805) 480-2677
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Cardiovascular Disease Physician (primary) Taxonomy 207RC0000X · Licence A43353 (CA)

Record details

NPI number1922038967
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 4, 2006
Last updated in NPPESOctober 17, 2011

Medicare enrollment

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

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Also practisesINTERNAL MEDICINE
Medical schoolDUKE UNIVERSITY SCHOOL OF MEDICINE
Graduated 1985 (41 years in practice)
Group practice Heart Center Cardiology — 2 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 patients1,528
Services billed 8,280 a service is one billed item, such as a visit, a test or a procedure
Average patient age79

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $2,772 129 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Los Robles Hospital & Medical Center Hospital · Thousand Oaks, CA · listed as Los Robles Hospital and Medical Center
  • Northridge Hospital Medical Center Hospital · Northridge, CA

Colleagues at Heart Center Cardiology

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Thousand Oaks