Melissa Ryan, RN

Primary specialty

Hematology & Oncology PhysicianTaxonomy code 207RH0003X

License

689841 Issued in CA

Practice address

505 Parnassus Ave
San Francisco, CA 94143-2204

Phone

(415) 353-1383

NPI assigned

Nov 3, 2025

Last updated

Nov 3, 2025By 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 1

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Registered Nurse

State licenses

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

{
    "created_epoch": "1762128000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1762128000000",
    "number": "1558230938",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "83 LIVE OAK AVE",
            "city": "FAIRFAX",
            "state": "CA",
            "postal_code": "949301203",
            "telephone_number": "415-353-1383"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "505 PARNASSUS AVE",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941432204",
            "telephone_number": "415-353-1383"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "RYAN",
        "first_name": "MELISSA",
        "credential": "RN",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2025-11-03",
        "last_updated": "2025-11-03",
        "certification_date": "2025-11-03",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "CA",
            "license": "689841",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Karen Ryan
• Katherine Joy Ryan, L.C.S.W.
• Kathleen Mary Ryan, FNP
• Kathleen Mary Ryan, NP
• Mark Ryan, PSYD
• Merle Ryan
• Sally Schneider Ryan, D.O.
• Sarah Caitlin Ryan, MD
• Susan M. Ryan, MD
• Terry Ryan

• Hematology & Oncology Physician in San Francisco, CA
• Providers in San Francisco, CA by specialty
• Hematology & Oncology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 3, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.