Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Michael J Oreilly, MD

Individual provider Surgery Physician · NPI 1548300015

Dr. Michael J Oreilly, MD practises General Surgery in Marietta, Georgia. Graduated from University of Texas Southwestern Medical School at Dallas in 1981, 45 years ago. Practices with Wellstar Medical Group LLC, a 3,072-clinician group and accepts Medicare assignment. Licensed in Georgia.

Years since qualifying
45
Trained at
University of Texas Southwestern Medical School at Dallas
Licensed in
GA
In the registry since
2007
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

800 Canton Rd NE
Marietta, GA 30060-7260
Phone: (770) 424-4328
Fax: (770) 426-9924
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence 34682 (GA)

Record details

NPI number1548300015
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 7, 2007
Last updated in NPPESOctober 11, 2019

Medicare enrollment

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

Medicare specialtyGENERAL SURGERY
Medical schoolUNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL SCHOOL AT DALLAS
Graduated 1981 (45 years in practice)
Group practice Wellstar Medical Group Llc — 3072 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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.

Hernia repair (minimally invasive) 31 times · 95th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 67 times · 69th 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 patients109
Services billed 267 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 $14 1 payment · 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.

  • Wellstar Cobb Medical Center Hospital · Austell, GA · listed as Wellstar Cobb Medical Group, LLC
  • Wellstar Paulding Medical Center Hospital · Hiram, GA · listed as Wellstar Paulding Medical Center, Inc
  • Wellstar Kennestone Regional Medical Center Hospital · Marietta, GA
  • Wellstar North Fulton Medical Center Hospital · Roswell, GA

Also affiliated with 1 long-term care hospital, which CMS identifies by certification number only.

Colleagues at Wellstar Medical Group LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3072 clinicians in the practice; 12 are shown here.

Other providers in Marietta