Amarillo Medical Specialists,LLP

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

Legal business name

AMARILLO MEDICAL SPECIALISTS,LLP

Practice address

9092 Westgate Pkwy W
Amarillo, TX 79124-2441

Phone

(806) 350-7520

Fax

(806) 350-2383

NPI assigned

May 2, 2006

Last updated

Oct 6, 2026By the provider in NPPES

Organization subpart

No

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

Authorized official

Name

Dr. Alan Keister, M.D.NPI 1255373635

Title

Managing Partner

Phone

(806) 355-9741

Specialties & licenses 14

Addresses

Medicare fee-for-service enrollment

Enrolled in TX

Enrollment records 1

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

CLIA laboratory certificates

Locations

Interoperability endpoints

• FHIR API: https://fhir4.healow.com/fhir/r4/FDFCAA

Practitioners 69

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles, and the practitioner matching its NPPES authorized official.

• Alan Wade Keister, M.D.

  • Internal Medicine Physician
  • Amarillo, TX
  • NPI 1255373635
  Medicare reassignment Care Compare group NPD Authorized official
• Estelle Archer, M.D.

  • Obstetrics & Gynecology Physician
  • Amarillo, TX
  • NPI 1134179492
  Medicare reassignment Care Compare group NPD
• Tiffani Gail Bethel

  • Family Nurse Practitioner
  • Amarillo, TX
  • NPI 1598413825
  Medicare reassignment Care Compare group NPD
• Sarah Biggs, MD

  • Allergy & Immunology Physician
  • Amarillo, TX
  • NPI 1376079202

  Internal Medicine

  Medicare reassignment Care Compare group NPD
• William Curtis Biggs, M.D.

  • Endocrinology, Diabetes & Metabolism Physician
  • Amarillo, TX
  • NPI 1033280862

  Internal Medicine

  Medicare reassignment Care Compare group NPD
• Trey Christopher Bowen, MD

  • Internal Medicine Physician
  • Amarillo, TX
  • NPI 1609432822
  Medicare reassignment Care Compare group NPD
• Ako D Bradford, MD

  • Internal Medicine Physician
  • Amarillo, TX
  • NPI 1891738712
  Medicare reassignment Care Compare group NPD
• Kenny M Brantley, M.D.

  • Endocrinology, Diabetes & Metabolism Physician
  • Amarillo, TX
  • NPI 1255408936
  Medicare reassignment Care Compare group NPD
• Amy J Brasher, FNP

  • Family Medicine Physician
  • Amarillo, TX
  • NPI 1922133966
  Medicare reassignment Care Compare group NPD
• Maria Cristina Espera Caga-Anan, M.D.

  • Endocrinology, Diabetes & Metabolism Physician
  • Amarillo, TX
  • NPI 1992002778

  Internal Medicine

  Medicare reassignment Care Compare group NPD
• Kathleen Anne Clark, M.D.

  • Internal Medicine Physician
  • Amarillo, TX
  • NPI 1518103886
  Medicare reassignment Care Compare group NPD
• Faith Coon, FNP-C

  • Primary Care Nurse Practitioner
  • Amarillo, TX
  • NPI 1740939974
  Medicare reassignment Care Compare group NPD

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

{
    "created_epoch": "1146528000000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1791244800000",
    "number": "1790743524",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "9092 WESTGATE PKWY W",
            "city": "AMARILLO",
            "state": "TX",
            "postal_code": "791242441",
            "telephone_number": "806-350-7520",
            "fax_number": "806-350-2383"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "9092 WESTGATE PKWY W",
            "city": "AMARILLO",
            "state": "TX",
            "postal_code": "791242441",
            "telephone_number": "806-350-7520",
            "fax_number": "806-350-2383"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "9092 Westgate Pkwy W",
            "address_purpose": "LOCATION",
            "city": "Amarillo",
            "state": "TX",
            "postal_code": "791242441",
            "country_code": "US",
            "telephone_number": "806-358-8331",
            "fax_number": "806-356-0045",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "organization_name": "AMARILLO MEDICAL SPECIALISTS,LLP",
        "organizational_subpart": "NO",
        "enumeration_date": "2006-05-02",
        "last_updated": "2026-10-06",
        "certification_date": "2026-10-06",
        "status": "A",
        "authorized_official_last_name": "KEISTER",
        "authorized_official_first_name": "ALAN",
        "authorized_official_title_or_position": "MANAGING PARTNER",
        "authorized_official_telephone_number": "806-355-9741",
        "authorized_official_name_prefix": "Dr.",
        "authorized_official_credential": "M.D."
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine",
            "state": "TX",
            "license": "G7553",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine",
            "state": null,
            "license": null,
            "primary": true
        },
        {
            "code": "207RE0101X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine, Endocrinology, Diabetes & Metabolism",
            "state": "TX",
            "license": "G3157",
            "primary": false
        },
        {
            "code": "207RE0101X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine, Endocrinology, Diabetes & Metabolism",
            "state": "TX",
            "license": "J8472",
            "primary": false
        },
        {
            "code": "207RE0101X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine, Endocrinology, Diabetes & Metabolism",
            "state": "TX",
            "license": "J9835",
            "primary": false
        },
        {
            "code": "207RE0101X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine, Endocrinology, Diabetes & Metabolism",
            "state": "TX",
            "license": "L4222",
            "primary": false
        },
        {
            "code": "207RI0200X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine, Infectious Disease",
            "state": "TX",
            "license": null,
            "primary": false
        },
        {
            "code": "207RN0300X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine, Nephrology",
            "state": "TX",
            "license": "H3590",
            "primary": false
        },
        {
            "code": "207RN0300X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine, Nephrology",
            "state": "TX",
            "license": "J5330",
            "primary": false
        },
        {
            "code": "207RN0300X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine, Nephrology",
            "state": "TX",
            "license": "J4363",
            "primary": false
        },
        {
            "code": "207RP1001X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine, Pulmonary Disease",
            "state": "TX",
            "license": "J7649",
            "primary": false
        },
        {
            "code": "207RR0500X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine, Rheumatology",
            "state": "TX",
            "license": "H8801",
            "primary": false
        },
        {
            "code": "207V00000X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Obstetrics & Gynecology",
            "state": "TX",
            "license": "G3114",
            "primary": false
        },
        {
            "code": "2084N0400X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Psychiatry & Neurology, Neurology",
            "state": "TX",
            "license": "H5053",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Amarillo Nephrology Associates, P.a.
• Amarillo North Texas Emergency Center, LLC
• Amarillo Oncology Associates LLP
• Amarillo Ophthalmic Associates PA

• Internal Medicine Physician in Amarillo, TX
• Providers in Amarillo, TX by specialty
• Internal Medicine Physician in Texas

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 6, 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.