Ryan Joseph Duff, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

2022041862 Issued in MO

Practice address

3551 Roger Brooke Dr
San Antonio, TX 78234-4504

Phone

(210) 916-2153

Fax

(210) 916-0709

NPI assigned

Feb 11, 2021

Sex

Male

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

Enrolled in MO

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.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

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

{
    "created_epoch": "1613001600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1781827200000",
    "number": "1043802929",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "3551 ROGER BROOKE DR",
            "city": "JBSA FT SAM HOUSTON",
            "state": "TX",
            "postal_code": "782344504",
            "telephone_number": "210-916-2153",
            "fax_number": "210-916-0709"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3551 ROGER BROOKE DR",
            "city": "SAN ANTONIO",
            "state": "TX",
            "postal_code": "782344504",
            "telephone_number": "210-916-2153",
            "fax_number": "210-916-0709"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DUFF",
        "first_name": "RYAN",
        "middle_name": "JOSEPH",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2021-02-11",
        "last_updated": "2026-06-19",
        "certification_date": "2026-06-19",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208D00000X",
            "taxonomy_group": "",
            "desc": "General Practice",
            "state": "MO",
            "license": "2022041862",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MO",
            "license": "2022041862",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Joslyn Duenes
• Elaine Marcel Duet-Lee, PT
• Douglas Arthur Duey, DDS
• Brian Duff, OTR/L, MSOT
• Rachel S Duff, OT
• Arthur Duffie
• Brent Duffield, CRNA
• Ann Teresa Duffy-Randall, ARNP,DMIN, MA,MSN,BC
• Dustin Duffy
• Jennifer Lynn Duffy, LCSW

• Internal Medicine Physician in San Antonio, TX
• Providers in San Antonio, 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 Jun 19, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.