DR. MARK H GREGORY MD
NPI 1104843663
Internal Medicine in Saint Louis, MO
About Dr. Mark H Gregory Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK H GREGORY MD (NPI 1104843663) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (100578) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Northwestern Medicine Central Dupage Hospital, and is a graduate of University Of Vermont College Of Medicine (1986).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Mark H Gregory Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Areas of Expertise CMS Part B claims 14
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Northwestern Medicine Central Dupage Hospital
Acute Care Hospitals · Winfield, ILMercy Hospital St Louis
Acute Care Hospitals · Saint Louis, MOBarnes Jewish Hospital
Acute Care Hospitals · Saint Louis, MOMissouri Baptist Medical Center
Acute Care Hospitals · Town And Country, MOBarnes-Jewish West County Hospital
Acute Care Hospitals · Creve Coeur, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63141 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mark Gregory's NPI number?
The NPI number for Mark Gregory is 1104843663. It was assigned to this individual provider in the NPPES registry on July 17, 2006.
Where is Mark Gregory located?
Mark Gregory practices at 555 N New Ballas Rd Suite 110, Saint Louis, MO 63141. The listed phone number is (314) 872-8470.
What is Mark Gregory's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mark Gregory enrolled in Medicare?
Yes. Mark Gregory is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
What insurance does Mark Gregory accept?
Health plans from UnitedHealthcare list Mark Gregory as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Mark Gregory affiliated with any hospitals?
According to CMS data, Mark Gregory is affiliated with Northwestern Medicine Central Dupage Hospital, Mercy Hospital St Louis, Barnes Jewish Hospital, Missouri Baptist Medical Center and Barnes-Jewish West County Hospital.
When was this NPI record last updated?
The NPPES record for Mark Gregory was last updated on July 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 29 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
