NPIMap

Individual provider Active NPI

Mark H Gregory, MD

  • Internal Medicine Physician
  • Saint Louis, MO
National Provider Identifier
1104843663
Registry record updated Jul 9, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
100578 Issued in MO
Practice address
555 N New Ballas Rd
Suite 110
Saint Louis, MO 63141-6825
Phone
(314) 872-8470
Fax
(314) 872-8472
NPI assigned
Jul 17, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jul 9, 2026

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X 100578 MO Primary

Addresses

Primary practice location

555 N New Ballas Rd
Suite 110
Saint Louis, MO 63141-6825

Mailing address

555 N New Ballas Rd Ste 110
Saint Louis, MO 63141-6884
Phone (314) 872-8470

Other identifiers 1

IdentifierTypeStateIssuer
920674500MedicaidMO

Electronic endpoints 1

TypeEndpointUseAffiliation
Direct Messaging Address mark.gregory.1@14439.direct.athenahealth.com Direct

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MO
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20040918000191 MO Practitioner - Internal MedicinePractitioner - General Practice 9234107111 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Internal Medicine
Education
University of Vermont College of Medicine, 1986
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services

Practice addresses (Care Compare)

555 N New Ballas Rd
Suite 110
Saint Louis, MO 63141-6884
Phone (314) 872-8470

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
85.54 of 100Reported as individual
Quality
89.06
Promoting interoperability
100
Improvement activities
40
Cost
62.73

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

Practice roles

OrganizationSpecialtyStatusNew patients
Mark H Gregory MD PC Internal Medicine CurrentSince Sep 1, 2015 Accepting new patients
Amy S Beck DO PC Internal Medicine Current Accepting new patients
Physician Groups LC Internal Medicine Past Accepting new patients

Locations

555 N New Ballas Rd
Ste 110
Saint Louis, MO 63141
Phone (314) 432-7272

Interoperability endpoints

  • Direct secure messaging: mgregory154825@direct.carenet.org
  • Direct secure messaging: mark.gregory.1@14439.direct.athenahealth.com

Organizations & group practices 3

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

Hospital & facility affiliations 9

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1153094400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783555200000",
    "number": "1104843663",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "555 N NEW BALLAS RD STE 110",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631416884",
            "telephone_number": "314-872-8470",
            "fax_number": "314-872-8472"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "555 N NEW BALLAS RD",
            "address_2": "SUITE 110",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631416825",
            "telephone_number": "314-872-8470",
            "fax_number": "314-872-8472"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GREGORY",
        "first_name": "MARK",
        "middle_name": "H",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-07-17",
        "last_updated": "2026-07-09",
        "certification_date": "2026-07-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MO",
            "license": "100578",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "920674500",
            "state": "MO"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "mark.gregory.1@14439.direct.athenahealth.com",
            "affiliation": "N",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "555 N New Ballas Rd",
            "address_2": "Suite 110",
            "city": "Saint Louis",
            "state": "MO",
            "country_code": "US",
            "postal_code": "631416825",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

Other providers in Saint Louis, MO

Sources for this page

Verify at the official NPI Registry.