Physician Profile
Unclaimed ProfileAbout MARKLEY
Based in Columbia, MO, John Gregory Markley, M.D. is listed in the NPI registry under cardiac surgery. John graduated from Medical College of Wisconsin in 1992. John is also listed as specialising in surgery and thoracic surgery (cardiothoracic).
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. Markley's specialty?
Dr. Markley is a cardiac surgeon in Columbia, MO. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “CARDIAC SURGERY”.
NPI registry
Where can I find Dr. Markley?
Dr. Markley is listed at ONE HOSPITAL DR, Columbia, MO 65212. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Markley?
The number on file is (573) 882-6955. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Markley's NPI number?
Dr. Markley's National Provider Identifier is 1932190980. 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. Markley's medical education?
Dr. Markley attended Medical College of Wisconsin, graduating in 1992. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Markley been practising?
Dr. Markley has 34 years experience. Calculated from a graduation year of 1992, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Markley known for?
According to Medicare billing data, Dr. Markley performs procedures including replacement of aortic valve through the skin and femoral artery, repair of mitral valve through the skin, initial prosthesis and harvest of vein using an endoscope. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Markley confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Markley. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (573) 882-6955
- Email not available
Practice Locations
ONE HOSPITAL DR
Columbia, MO 65212
Procedures Most Often Billed to Medicare
82 services · 82 patients · 5 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Replacement of aortic valve through the skin and femoral artery | Procedure | 33361 |
32 |
| Repair of mitral valve through the skin, initial prosthesis | Procedure | 33418 |
16 |
| Harvest of vein using an endoscope | Procedure | 33508 |
12 |
| Insertion of non-tunneled central venous tube for infusion (5 years or older) | Procedure | 36556 |
11 |
| Coronary artery bypass using artery graft, 1 graft | Procedure | 33533 |
11 |
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.
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.
Other cardiac surgeons in Columbia 2
Same specialty, same city.
Trained at Medical College of Wisconsin 3
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1992 at Medical College of Wisconsin 8
Providers who graduated from the same medical school in the same year.
Also performs Replacement of aortic valve through the skin and femoral artery 8
Providers in MO 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.