Physician Profile
Unclaimed ProfileAbout O'CONNOR
Mark J. O'Connor, M.D. practises cardiovascular disease (cardiology) in Leominster, MA. Mark is a 2012 graduate of University of Massachusetts Medical School. Mark is also listed as specialising in cardiovascular disease.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What is Dr. O'Connor's specialty?
Dr. O'Connor is a cardiovascular disease (cardiology) in Leominster, MA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “CARDIOVASCULAR DISEASE (CARDIOLOGY)”.
NPI registry
Where can I find Dr. O'Connor?
Dr. O'Connor is listed at 100 HOSPITAL RD, Leominster, MA 01453. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. O'Connor?
The number on file is (978) 466-2052. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. O'Connor's NPI number?
Dr. O'Connor's National Provider Identifier is 1215297270. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. O'Connor's medical education?
Dr. O'Connor attended University of Massachusetts Medical School, graduating in 2012. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. O'Connor been practising?
Dr. O'Connor has 14 years experience. Calculated from a graduation year of 2012, reported in the CMS National Downloadable File.
CMS public data
What is Dr. O'Connor known for?
According to Medicare billing data, Dr. O'Connor provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report and ultrasound of heart with color-depicted blood flow, rate, direction and valve function, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. O'Connor confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. O'Connor. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (978) 466-2052
- Email not available
Practice Locations
100 HOSPITAL RD
Leominster, MA 01453
Procedures Most Often Billed to Medicare
2,983 services · 2,000 patients · 19 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
1,054 |
| Ultrasound of heart with color-depicted blood flow, rate, direction and valve function | Treatment | 93306 |
224 |
| Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days | Treatment | 93296 |
159 |
| Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days | Treatment | 93294 |
112 |
| Evaluation of single, dual, or multiple lead implantable defibrillator system, remote up to 90 days | Treatment | 93295 |
48 |
| Evaluation of implantable heart and blood vessel monitoring system, remote up to 30 days | Treatment | 93297 |
39 |
| Ultrasound of heart with color-depicted blood flow, rate, direction and valve function | Treatment | 93306 |
34 |
| Heart rhythm recording continous external ekg over more than 48 hours up to 7 days | Treatment | 93242 |
33 |
| Electrocardiogram (ecg) up to 30 days continuous with review and report by health care professional | Treatment | 93228 |
29 |
| Programming of dual lead pacemaker system | Treatment | 93280 |
22 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other cardiovascular diseases at this location 2
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 2
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 29 related providers in 4 groups
Other cardiovascular diseases in Leominster 5
Same specialty, same city.
Trained at University of Massachusetts Medical School 8
Other providers in the same specialty who trained at the same institution.
Class of 2012 at University of Massachusetts Medical School 8
Providers who graduated from the same medical school in the same year.
Also performs Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 8
Providers in MA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.