Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MARK O'CONNOR MD
NPI 1245232800
Internal Medicine - Clinical Cardiac Electrophysiology in Toledo, OH

Q: What is Mark O'connor's NPI number?

The NPI number for Mark O'connor is 1245232800. It was assigned to this individual provider in the NPPES registry on August 12, 2005.

Q: What is Mark O'connor's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Clinical Cardiac Electrophysiology, with taxonomy code 207RC0001X.

Q: When was this NPI record last updated?

The NPPES record for Mark O'connor was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since August 12, 2005PECOS EnrolledAccepts Medicare Assignment

2409 CHERRY ST, STE 100, TOLEDO, OH 43608(419) 251-3700(419) 251-3835 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Mark O'connor Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARK O'CONNOR MD (NPI 1245232800) is an individual clinical cardiac electrophysiology provider in Toledo, Ohio, licensed in Ohio (350721050) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, is affiliated with Promedica Toledo Hospital, and is a graduate of University Of Michigan Medical School (1986).

NPPES Registry Identity

NPI1245232800

Entity TypeIndividualMale

Primary Taxonomy207RC0001X

Provider Legal NameMARK O'CONNORCredential: MD

Location Address2409 CHERRY ST, STE 100Toledo, OH 43608-2625

Mailing Address2409 Cherry St, Ste 100Toledo, OH 43608-2625 · (419) 251-3700 · Fax (419) 251-3835

Phone(419) 251-3700

Fax(419) 251-3835

Sole ProprietorNo

Medical School CMSUniversity Of Michigan Medical SchoolGraduated 1986

Enumeration DateAugust 12, 2005

Last NPPES UpdateSeptember 29, 2026

✔ NPI 1245232800 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Clinical Cardiac ElectrophysiologyAllopathic & Osteopathic Physicians

Taxonomy Code207RC0001X

License✔ Licensed in OH · 350721050

Definition

A field of special interest within the subspecialty of cardiovascular disease, specialty of Internal Medicine, which involves intricate technical procedures to evaluate heart rhythms and determine appropriate treatment for them.

2409 CHERRY ST, Toledo, OH 43608

Open in Google Maps ↗

Other Identifiers 6

Medicaid4140805MI

Other02570OH · Paramount

Other1105810672MI · Blue Cross Blue Shield Michigan

Other000000140670OH · Anthem

Other060056251OH · Railroad Medicare

Medicaid2018846OH

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mark O'connor Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2466447727

PECOS Enrollment IDI20040416000393, I20121019000084

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Mark O'connor reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Toledo Cardiology Consultants Inc

Same address

Cardiovascular Disease

2409 CHERRY ST, SUITE 100
Toledo, OH 43608

Reassigned Medicare billing, Michigan and Ohio enrollments
Also billed through NPI 1811863202 (Ohio)
5 clinicians in this Medicare group

NPI 1134164775 (419) 251-3711

Mercy Health Physicians North Specialty Care LLC

0.9 mi

Surgery

2200 JEFFERSON AVE
Toledo, OH 43604

Reassigned Medicare billing, Michigan and Ohio enrollments
21 clinicians in this Medicare group

NPI 1306468418 (888) 696-3541

Mercy Health Physicians-North LLC

0.9 mi

Family Medicine

2200 JEFFERSON AVE
Toledo, OH 43604

Reassigned Medicare billing, Michigan and Ohio enrollments
22 clinicians in this Medicare group

NPI 1609000769 (419) 871-6359

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 23

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

853 services501 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

838 services495 patients

Programming of dual lead pacemaker system 93280

Programming of a dual lead pacemaker system is a procedure to adjust your heart's pacemaker settings. This process involves a small device, called a programmer, that communicates with your pacemaker to ensure it's working optimally for your heart's needs.

206 services125 patients

Evaluation of single, dual, or multiple lead implantable defibrillator system 93289

This procedure evaluates your implantable defibrillator system, which helps regulate your heart rhythm. It can involve single, dual, or multiple lead systems. It's essential to ensure the device is working correctly and adjusting to your heart's needs.

119 services76 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010

A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.

109 services92 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

100 services63 patients

Programming of single lead implantable defibrillator system 93282

Programming of a single lead implantable defibrillator system involves setting up and adjusting a device implanted in your body. This device helps regulate your heartbeat. It can detect irregular heart rhythms and provide corrective electric shocks to restore a normal heartbeat.

75 services41 patients

Technetium tc-99m sestamibi, diagnostic, per study dose A9500

Technetium Tc-99m Sestamibi is a diagnostic test used to create images of your heart or breast tissues. It involves a safe radioactive substance injection that helps doctors to detect any abnormalities or changes in these tissues.

74 services36 patients

Programming of multiple lead implantable defibrillator system 93284

Programming of a multiple lead implantable defibrillator system involves adjusting settings on your implanted device to help control irregular heart rhythms. The process is non-invasive and helps ensure optimal device performance for maintaining heart health.

73 services41 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

66 services65 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision and review by physician 93015

An exercise or drug-induced heart stress test with ECG is a procedure performed by a doctor to assess how your heart responds to exertion. It involves monitoring your heart's electrical activity while you exercise or after medication is given to mimic exercise effects.

63 services63 patients

Infusion, normal saline solution, 250 cc J7050

An infusion of normal saline solution, 250 cc, involves administering a sterile saltwater solution into your body through a vein, usually in your arm. This helps to replenish fluids, maintain hydration, and balance electrolytes in your body.

37 services36 patients

Evaluation of cardiac rhythm monitor system 93291

The evaluation of a cardiac rhythm monitor system involves checking your heart's electrical activity. It's a non-invasive procedure that uses a device to record your heart's rhythm and rate. This helps identify any irregularities, ensuring your heart is functioning properly.

35 services25 patients

Injection, regadenoson, 0.1 mg J2785

Regadenoson injection, 0.1 mg, is a medication used to help visualize the heart during a stress test. It works by increasing blood flow in the arteries of the heart. It's injected into a vein and is generally well-tolerated.

35 services35 patients

Programming of cardiac rhythm monitor system 93285

Programming of a cardiac rhythm monitor system involves setting up a device to track your heart's activity. This helps identify irregular heartbeats or rhythms. The data collected assists your healthcare team in making accurate treatment decisions.

30 services21 patients

Programming of dual lead implantable defibrillator system 93283

Programming of a dual lead implantable defibrillator system involves adjusting settings on a device implanted in your chest. This device monitors your heart rhythm and delivers electrical pulses to correct irregular heartbeats, helping maintain a healthy heart rhythm.

24 services23 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

23 services23 patients

Evaluation of implantable heart and blood vessel monitoring system, remote up to 30 days 93297

This service involves remotely monitoring your heart and blood vessel implant system for up to 30 days. Using advanced technology, healthcare professionals can track the device's performance and your health status, ensuring the system is working optimally for your needs.

22 services18 patients

Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days 93296

This procedure involves remotely monitoring your pacemaker or implantable defibrillator system. Over a 90-day period, we check the device's performance and your heart's activity. This helps ensure the device is functioning properly and providing the best possible support for your heart health.

17 services14 patients

Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days 93294

This procedure evaluates your pacemaker system remotely for up to 90 days. It checks whether single, dual, multiple lead, or leadless pacemakers are working properly. It's a safe, convenient way to ensure your heart device is functioning optimally.

16 services13 patients

Injection, aminophyllin, up to 250 mg J0280

An aminophyllin injection is a treatment often used for severe asthma or other lung conditions. It helps to relax and open air passages in the lungs, making it easier to breathe. Up to 250 mg can be administered in one dose.

13 services13 patients

Insertion of pacemaker and upper and lower heart chamber electrode 33208

A pacemaker insertion is a procedure where a small device, called a pacemaker, is implanted under your skin. This device uses electrical pulses to prompt the heart to beat at a normal rate. Electrodes are placed in the upper and lower chambers of your heart to help regulate your heartbeat.

12 services12 patients

Insertion of implantable defibrillator system 33249

The insertion of an implantable defibrillator system is a procedure to manage irregular heart rhythms. A small device is placed under your skin, which monitors your heart rate. If it detects an abnormal rhythm, it sends an electrical pulse to restore normal heartbeat.

11 services11 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Promedica Toledo Hospital

Acute Care Hospitals · Toledo, OH

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number360068

Location2142 North Cove BoulevardToledo, OH 43606 · Lucas County

Emergency services Birthing friendly

Mercy Health - Tiffin Hospital

Acute Care Hospitals · Tiffin, OH

5/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number360089

Location45 St Lawrence DriveTiffin, OH 44883 · Seneca County

Emergency services Birthing friendly

Mercy St Vincent Medical Center

Acute Care Hospitals · Toledo, OH

3/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number360112

Location2213 Cherry StreetToledo, OH 43608 · Lucas County

Emergency services Birthing friendly

Mercy Health - Willard Hospital

Critical Access Hospitals · Willard, OH

OwnershipVoluntary non-profit - Private

CMS Certification Number361310

Location1100 Neal Zick RoadWillard, OH 44890 · Huron County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 43608 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$126.12 typical visit price

range $54.34 – $166.65

Typical copayment $31.53 (range $13.58 – $41.66)

Most-billed visit code 99204

Established Patient

$96.44 typical visit price

range $17.10 – $135.40

Typical copayment $24.11 (range $4.27 – $33.85)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. BASEM A ALAWNEH MD

Internal Medicine (Interventional Cardiology)

2409 CHERRY ST
TOLEDO, OH 43608

Lucas County (419) 407-3040

THEODORE J. WARE MD

Internal Medicine

2409 CHERRY ST, SUITE 207
TOLEDO, OH 43608

Lucas County (419) 251-4696

RANDALL MCCORMICK TOLEDO INTERNAL MEDICINE SPEC INC

Internal Medicine

2409 CHERRY ST, STE 207
TOLEDO, OH 43608

Lucas County (419) 251-7672

WANDA JEAN NEWBERN NP-C

Nurse Practitioner (Adult Health)

2409 CHERRY ST, 100
TOLEDO, OH 43608

Lucas County (419) 251-3700

TOLEDO CARDIOLOGY CONSULTANTS INC

Internal Medicine (Cardiovascular Disease)

2409 CHERRY ST, SUITE 100
TOLEDO, OH 43608

Lucas County (419) 251-3711

DR. HUNTER OSTLIE MD

Student in an Organized Health Care Education/Training Program

2409 CHERRY ST
TOLEDO, OH 43608

Lucas County (419) 251-6553

GLENN LUTHER CRNA

Nurse Anesthetist, Certified Registered

2409 CHERRY ST, #305
TOLEDO, OH 43608

Lucas County (419) 251-3740

TOLEDO SURGICAL SPECIALISTS, INC.

Surgery

2409 CHERRY ST, MOB 303
TOLEDO, OH 43608

Lucas County (419) 251-4674

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark O'connor's NPI number?

The NPI number for Mark O'connor is 1245232800. It was assigned to this individual provider in the NPPES registry on August 12, 2005.

Where is Mark O'connor located?

Mark O'connor practices at 2409 Cherry St Ste 100, Toledo, OH 43608. The listed phone number is (419) 251-3700.

What is Mark O'connor's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Clinical Cardiac Electrophysiology, with taxonomy code 207RC0001X.

Is Mark O'connor enrolled in Medicare?

Yes. Mark O'connor is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Mark O'connor's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark O'connor reassigns Medicare benefits to 3 organizations: Toledo Cardiology Consultants Inc (Toledo, OH), Mercy Health Physicians North Specialty Care LLC (Toledo, OH) and Mercy Health Physicians-North LLC (Toledo, OH). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark O'connor's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mark O'connor accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Anthem Blue Cross and Blue Shield and Antidote Health Plan of Ohio, Inc. and 7 other insurers list Mark O'connor as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Mark O'connor affiliated with any hospitals?

According to CMS data, Mark O'connor is affiliated with Promedica Toledo Hospital, Mercy Health - Tiffin Hospital, Mercy St Vincent Medical Center and Mercy Health - Willard Hospital.

When was this NPI record last updated?

The NPPES record for Mark O'connor was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.