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

Dr. Nicholas J Mandalakas, MD

Individual provider Cardiovascular Disease Physician · NPI 1811988868

Dr. Nicholas J Mandalakas, MD is registered under Cardiovascular Disease (Cardiology) in Dover, Delaware. Graduated from Jefferson Medical College of Thomas Jefferson University in 1985, 41 years ago. Practices with Bayhealth Medical Center, Inc, a 401-clinician group and accepts Medicare assignment. Licensed in Delaware and Pennsylvania.

Years since qualifying
41
Trained at
Jefferson Medical College of Thomas Jefferson University
Licensed in
DE, PA
In the registry since
2005
Specialties on file
4
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1113 S State St Ste 100
Dover, DE 19901-4112
Phone: (302) 734-7676
Fax: (302) 734-7615
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Cardiac Electrophysiology Physician (primary) Taxonomy 207RC0001X · Licence C1-0024586 (DE)
Cardiovascular Disease Physician Taxonomy 207RC0000X · Licence C1-0024586 (DE)
Cardiovascular Disease Physician Taxonomy 207RC0000X · Licence MD037192E (PA)
Clinical Cardiac Electrophysiology Physician Taxonomy 207RC0001X · Licence MD037192E (PA)

Record details

NPI number1811988868
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 31, 2005
Last updated in NPPESMarch 3, 2022
Certification dateMarch 3, 2022

Medicare enrollment

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

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Also practisesCARDIAC ELECTROPHYSIOLOGY
Medical schoolJEFFERSON MEDICAL COLLEGE OF THOMAS JEFFERSON UNIVERSITY
Graduated 1985 (41 years in practice)
Group practice Bayhealth Medical Center, Inc — 401 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Pacemaker insertion or repair 32 times · 80th percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients1,906
Services billed 5,875 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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 $624 27 payments · a meal or drink at a meeting or visit, not a fee
Travel and Lodging $110 1 payment · travel or lodging paid or reimbursed, such as to attend a conference

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.

Colleagues at Bayhealth Medical Center, Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 401 clinicians in the practice; 12 are shown here.

Other providers in Dover