Dr. Mark O'Connor, MD
Not yet claimedCardiologist, Electrophysiologist · Physician (MD)
Toledo, OH
Dr. O'Connor is an electrophysiologist who has practiced at Toledo Cardiology Consultants since 1999 and serves as Co-Director of the Electrophysiology Laboratory at Mercy St. Vincent Medical Center, specializing in arrhythmia management.
About Dr. Mark O'Connor, MD
Updated Sep 21, 2026 · next review Dec 20, 2026Dr. Mark O'Connor is a cardiologist and electrophysiologist practicing in Toledo, Ohio. He works at Toledo Cardiology Consultants and serves as Co-Director of the Electrophysiology Laboratory there. He is affiliated with several Mercy Health hospitals in the Toledo area, including Mercy St. Vincent Medical Center, where he is also part of the team for the Cardiovascular Disease Fellowship program.
Dr. O'Connor earned his medical degree from the University of Michigan Medical School and completed additional training at the University of Washington, the University of Michigan (cardiology fellowship), and Loyola University Medical Center (electrophysiology fellowship). He is board certified in cardiovascular disease and internal medicine, and is a Fellow of the American College of Cardiology (FACC). Earlier in his career he was an Assistant Professor at Rush University and published several research papers and a book chapter on heart arrhythmias, along with participating in continuing medical education teaching, mostly during the 1990s. No more recent publications, society leadership roles, or awards were found in available searches.
From 2021 to 2025, CMS Open Payments records show Dr. O'Connor received a total of $934.87 across 10 payment records from pharmaceutical and medical device companies, including Kestra Medical Technology, Esperion Therapeutics, iRhythm Technologies, Boehringer Ingelheim, and Pfizer. These kinds of industry payments are common and legal, and are publicly disclosed for transparency.
No news coverage from the last three years, public statements on vaccines or alternative medicine, or license discipline, lawsuit, or criminal records were found for Dr. O'Connor in available searches.
- Electrophysiology Lab Co-Director
- Dr. O'Connor is listed as Co-Director of the Electrophysiology Laboratory at Toledo Cardiology Consultants. toledocardiology.com
- Board certifications
- He is board certified in cardiovascular disease/cardiology and internal medicine, according to third-party physician directories. doctor.webmd.com
- Fellow of the American College of Cardiology
- He holds the FACC credential, listed alongside his name and title on his practice bio page. toledocardiology.com
- Medical training
- He earned his MD from the University of Michigan Medical School and did further training at the University of Washington and Loyola University Medical Center. toledocardiology.com
- Cardiology fellowship faculty program
- He is listed as part of the team for the Cardiovascular Disease Fellowship at Mercy Health-St. Vincent Medical Center in Toledo. mercy.com
- 1990s arrhythmia research
- He co-authored several published papers on cardiac arrhythmias and a book chapter on supraventricular arrhythmia during his fellowship and early academic career. toledocardiology.com
- Past academic appointment
- He served as an Assistant Professor in the Division of Cardiology at Rush University and as an Assistant Attending Physician at Rush-Presbyterian-St. Luke's Medical Center from 1994 to 1996. toledocardiology.com
- Multi-hospital affiliations
- He is affiliated with multiple Mercy Health hospitals in the Toledo area, including Mercy St. Vincent, Mercy St. Anne, Mercy St. Charles, and Mercy Tiffin Hospitals. toledocardiology.com
Worth knowing
- Some patient reviews on consumer sites mention long scheduling delays and give mixed satisfaction ratings; these are informal patient opinions, not regulatory or licensing records. ratemds.com
- CMS Open Payments records show Dr. O'Connor received a total of $934.87 from pharmaceutical and device companies between 2021 and 2025. Such payments are common and legal, and are publicly disclosed for transparency purposes. toledocardiology.com
Industry payments (CMS Open Payments)
Open the CMS recordFederal law requires drug and device companies to report what they pay clinicians: meals, travel, speaking, consulting, and research. Payments are common and legal; the point is that you can see them.
2021 to 2025
$935
10 payments
| 2021 | $0 |
| 2022 | $619 |
| 2023 | $296 |
| 2024 | $0 |
| 2025 | $20 |
Top payers
- Kestra Medical Technology Services, Inc.$216
- Esperion Therapeutics, Inc.$125
- iRhythm Technologies, Inc.$120
- Boehringer Ingelheim Pharmaceuticals, Inc.$110
- PFIZER INC.$99
Payment types
- Food and Beverage$935
A word of caution about these numbers
A payment does not mean your doctor is compromised or acting unethically. Most of these entries are drug samples left for patients, or lunch brought in for the office staff, and the amounts are usually small. Research funding and speaking at medical meetings are also normal parts of a clinical career.
As a rough guide, a total under $15,000 a year is usually not a concern. Much larger sums, especially from one company whose product your doctor recommends to you, are worth asking about. You are allowed to ask.
Sources: toledocardiology.com · facebook.com · doximity.com · mercy.com · mercy.com · healthytime.org · doctor.webmd.com · care.healthline.com. Something wrong or out of date? Tell us and we will correct it.
Summary prepared with AI assistance from the public sources linked above, reviewed every three months. It is not a review, a rating, or an endorsement.
Practice location
Toledo Cardiology Consultants, Inc.
2409 Cherry Street, Suite 100
Toledo, OH 43608
Open in maps