Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Mark H Gregory, MD

Individual provider Internal Medicine Physician · NPI 1104843663

Dr. Mark H Gregory, MD practises Internal Medicine in Saint Louis, Missouri. Graduated from University of Vermont College of Medicine in 1986, 40 years ago. Accepts Medicare assignment and offers telehealth. Licensed in Missouri.

Years since qualifying
40
Trained at
University of Vermont College of Medicine
Licensed in
MO
In the registry since
2006
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

555 N New Ballas Rd Ste 110
Saint Louis, MO 63141-6825
Phone: (314) 872-8470
Fax: (314) 872-8472
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 100578 (MO)

Record details

NPI number1104843663
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 17, 2006
Last updated in NPPESJuly 9, 2026
Certification dateJuly 9, 2026

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF VERMONT COLLEGE OF MEDICINE
Graduated 1986 (40 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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 patients250
Services billed 2,769 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Also affiliated with 1 inpatient rehabilitation facility, which CMS identifies by certification number only.

Other providers in Saint Louis