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

Dr. John Gregory Markley, MD

Individual provider Surgery Physician · NPI 1932190980

Dr. John Gregory Markley, MD practises Cardiac Surgery in Columbia, Missouri. Graduated from Medical College of Wisconsin in 1992, 34 years ago. Practices with The Curators of the University of Missouri, a 1,093-clinician group and accepts Medicare assignment. Licensed in California, Missouri and Wisconsin.

Years since qualifying
34
Trained at
Medical College of Wisconsin
Licensed in
CA, MO, WI
In the registry since
2005
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Partly verified

Some contact details are missing from the federal record.

One Hospital Dr
Columbia, MO 65212-0001
Phone: (573) 882-6955
Fax: (573) 884-0437
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (primary) Taxonomy 208G00000X · Licence 2002023140 (MO)
Surgery Physician Taxonomy 208600000X · Licence G85299 (CA)
Surgery Physician Taxonomy 208600000X · Licence 34541-020 (WI)

Record details

NPI number1932190980
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedOctober 31, 2005
Last updated in NPPESMarch 29, 2018

Medicare enrollment

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

Medicare specialtyCARDIAC SURGERY
Also practisesTHORACIC SURGERY
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 1992 (34 years in practice)
Group practice The Curators Of The University Of Missouri — 1093 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.

Coronary artery bypass graft (CABG) 21 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 patients104
Services billed 214 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.

Travel and Lodging $2,491 4 payments · travel or lodging paid or reimbursed, such as to attend a conference
Food and Beverage $1,111 17 payments · 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.

Colleagues at The Curators of the University of Missouri

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1093 clinicians in the practice; 12 are shown here.

Other providers in Columbia