Riannon Christa Atwater, MD

Primary specialty

Hospitalist PhysicianTaxonomy code 208M00000X

License

DR.0077832 Issued in CO

Practice address

777 Bannock St
Denver, CO 80204-4597

Phone

(303) 436-6000

NPI assigned

Apr 7, 2022

Last updated

May 27, 2026By the provider in NPPES

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Specialty

HospitalistAlso: Internal Medicine

Education

University of Colorado School of Medicine, Aurora, 2022

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Interoperability endpoints

• Direct secure messaging: ratwater142356@direct.ohsu.edu

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

{
    "created_epoch": "1649289600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1779840000000",
    "number": "1952043374",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "601 S BROADWAY FL 5",
            "city": "DENVER",
            "state": "CO",
            "postal_code": "802094081",
            "telephone_number": "303-602-7000"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "777 BANNOCK ST",
            "city": "DENVER",
            "state": "CO",
            "postal_code": "802044597",
            "telephone_number": "303-436-6000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ATWATER",
        "first_name": "RIANNON",
        "middle_name": "CHRISTA",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2022-04-07",
        "last_updated": "2026-05-27",
        "certification_date": "2026-05-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "CO",
            "license": "DR.0077832",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Hospitalist Physician in Denver, CO
• Providers in Denver, CO by specialty
• Hospitalist Physician in Colorado

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 27, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• 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.