NPIMap

Individual provider Active NPI

John Spencer Mays, MD

  • General Practice Physician
  • Saint Louis, MO
National Provider Identifier
1083108062
Registry record updated Sep 1, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
General Practice PhysicianTaxonomy code 208D00000X
License
2020001817 Issued in MO
Practice address
1044 N Mason Rd
Div Im General Med, Ste 330
Saint Louis, MO 63141-6431
Phone
(314) 996-8103
Fax
(314) 996-3230
NPI assigned
Jun 21, 2018
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Sep 1, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X 2020001817 MO
General Practice Physician 208D00000X 2020001817 MO Primary

Addresses

Primary practice location

1044 N Mason Rd
Div Im General Med, Ste 330
Saint Louis, MO 63141-6431

Mailing address

PO Box 7412011
Chicago, IL 60674-2011
Phone (314) 996-8103

Electronic endpoints 1

TypeEndpointUseAffiliation
FHIR URL https://epicproxy.et0965.epichosted.com/FHIRProxy/api/FHIR/DSTU2/ Washington University

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
I20210714000243 MO Practitioner - Internal Medicine 8729410790 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Internal Medicine
Education
University of Tennessee, HSC, College of Medicine, 2018
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Physician Groups LCGroup PAC ID 3072421254, 526 clinicians
Elite Physical Therapy of Creve Coeur LLCGroup PAC ID 7719280841, 85 clinicians

Practice addresses (Care Compare)

1110 Highlands Plaza Dr E
Saint Louis, MO 63110-1351
Phone (314) 273-0195

12788 Olive Blvd
Creve Coeur, MO 63141-6211

15425 Manchester Rd
Suite 28
Ballwin, MO 63011-3077
Phone (636) 220-6969

2630 Hwy K
O Fallon, MO 63368-6624
Phone (636) 240-5454

9594 Manchester Rd
Saint Louis, MO 63119-1313
Phone (314) 274-6314

969 N Mason Rd
Saint Louis, MO 63141-6338

Hospital & facility affiliations

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
2020001817MOMDInternal Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Physician Groups LC Internal Medicine CurrentSince Aug 1, 2021 Accepting new patients
Physician Groups LC CurrentSince Aug 1, 2021 Accepting new patients

Locations

2630 Highway K
O Fallon, MO 63368
Phone (636) 240-5454

969 N Mason Rd
Ste 110
Saint Louis, MO 63141
Phone (314) 996-3434

969 N Mason Rd
Ste 160
Saint Louis, MO 63141
Phone (314) 434-8828

Organizations & group practices 5

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 10

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": "1529539200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1788220800000",
    "number": "1083108062",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 7412011",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606742011",
            "telephone_number": "314-996-8103",
            "fax_number": "314-996-3230"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1044 N MASON RD",
            "address_2": "DIV IM GENERAL MED, STE 330",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631416431",
            "telephone_number": "314-996-8103",
            "fax_number": "314-996-3230"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MAYS",
        "first_name": "JOHN",
        "middle_name": "SPENCER",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2018-06-21",
        "last_updated": "2026-09-01",
        "certification_date": "2023-03-22",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MO",
            "license": "2020001817",
            "primary": false
        },
        {
            "code": "208D00000X",
            "taxonomy_group": "",
            "desc": "General Practice",
            "state": "MO",
            "license": "2020001817",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://epicproxy.et0965.epichosted.com/FHIRProxy/api/FHIR/DSTU2/",
            "affiliation": "Y",
            "affiliationName": "Washington University",
            "address_1": "1044 N Mason Rd",
            "address_2": "Div IM General Med, Ste 330",
            "city": "Saint Louis",
            "state": "MO",
            "country_code": "US",
            "postal_code": "631416431",
            "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.