NPIMap

Organization Active NPI

Clayton Medical Associates, P.C.

  • Rheumatology Physician
  • Saint Louis, MO
National Provider Identifier
1891774329
Registry record updated Jul 16, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Rheumatology PhysicianTaxonomy code 207RR0500X
Legal business name
CLAYTON MEDICAL ASSOCIATES, P.C.
Doing business as
Saint Louis Rheumatology
Practice address
520 S Elm Ave
Saint Louis, MO 63119-3845
Phone
(314) 645-4434
Fax
(314) 645-3801
NPI assigned
Jan 12, 2006
Organization subpart
No

NPPES NPI Registry

Updated by the provider on Jul 16, 2026

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

Authorized official

Name
Mrs. Laci Hueffmeier
Title
Practice Administrator
Phone
(314) 645-4434

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Rheumatology PhysicianGroup: 193400000X SINGLE SPECIALTY GROUP 207RR0500X Primary
Non-Pharmacy Dispensing Site 332900000X

Addresses

Primary practice location

520 S Elm Ave
Saint Louis, MO 63119-3845

Mailing address

520 S Elm Ave
Saint Louis, MO 63119-3845
Phone (314) 645-4434

Other names 1

  • Saint Louis Rheumatology Doing business as

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MO

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
O20050112000353 MO Part B Supplier - Clinic/Group Practice 9133177587 Receives reassigned benefits from 11 practitioners
Practice locations: Bridgeton, MO; Saint Louis, MO

Laboratory certificates & supplier records

Derived by NPIMap

These CMS records do not include an NPI. They are shown because their name and street address match this provider’s.

CLIA laboratory certificates

CLIA numberLaboratoryCertificateExpires
26D0983231Saint Louis Rheumatology520 South Elm Ave, Saint Louis, MO 63119Certificate of waiverApr 26, 2027

National Provider Directory

National Provider Directory

Locations

6400 Clayton Rd
Ste 110
Saint Louis, MO 63117
Phone (314) 645-4434

Practitioners & affiliated clinicians

Practitioners 11

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles.

NPI Registry JSON

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

{
    "created_epoch": "1137024000000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1784160000000",
    "number": "1891774329",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "520 S ELM AVE",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631193845",
            "telephone_number": "314-645-4434",
            "fax_number": "314-645-3801"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "520 S ELM AVE",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631193845",
            "telephone_number": "314-645-4434",
            "fax_number": "314-645-3801"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "CLAYTON MEDICAL ASSOCIATES, P.C.",
        "organizational_subpart": "NO",
        "enumeration_date": "2006-01-12",
        "last_updated": "2026-07-16",
        "certification_date": "2026-07-16",
        "status": "A",
        "authorized_official_last_name": "HUEFFMEIER",
        "authorized_official_first_name": "LACI",
        "authorized_official_title_or_position": "PRACTICE ADMINISTRATOR",
        "authorized_official_telephone_number": "314-645-4434",
        "authorized_official_name_prefix": "Mrs."
    },
    "taxonomies": [
        {
            "code": "207RR0500X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Internal Medicine, Rheumatology",
            "state": null,
            "license": null,
            "primary": true
        },
        {
            "code": "332900000X",
            "taxonomy_group": "",
            "desc": "Non-Pharmacy Dispensing Site",
            "state": null,
            "license": null,
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "organization_name": "Saint Louis Rheumatology",
            "code": "3",
            "type": "Doing Business As"
        }
    ]
}

Other providers in Saint Louis, MO

Sources for this page

  • NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 16, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
  • Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
  • Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
  • National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.