Samuel Massion

Primary specialty

Hospitalist PhysicianTaxonomy code 208M00000X

License

A201779 Issued in CA

Practice address

505 Parnassus Ave
San Francisco, CA 94143-2204

Phone

(415) 476-1528

NPI assigned

Apr 3, 2023

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 CA

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

Specialty

HospitalistAlso: Internal Medicine

Education

Other, 2023

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

State licenses

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Regents of the University of California

  • Internal Medicine Physician
  • San Francisco, CA
  • NPI 1760552343
  Medicare reassignment
• UCSF Medical Group Business Services

  • Internal Medicine Physician
  • San Francisco, CA
  • NPI 1477624104
  Medicare reassignment
• University of California San Francisco

  • Pediatrics Physician
  • San Francisco, CA
  • NPI 1861578973
  Medicare reassignment

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

{
    "created_epoch": "1680480000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1779235200000",
    "number": "1821793654",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "505 PARNASSUS AVE # M1480",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941432204"
        },
        {
            "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": "415-476-1528"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MASSION",
        "first_name": "SAMUEL",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2023-04-03",
        "last_updated": "2026-05-20",
        "certification_date": "2026-05-20",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "CA",
            "license": "A201779",
            "primary": true
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A201779",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Massage Grottosf LLC
• Lance Philip Masserant
• Christa Massie
• Lauren Mason Massie, RDN, LD, CLC
• Teresa Lynn Dillen Massillon, IBCLC
• Rajeev Masson
• Dylan Masters, MD
• Nicole Masters, L.AC.
• Steven J. Masters, MD
• Frances Emily Masterson

• Hospitalist Physician in San Francisco, CA
• Providers in San Francisco, CA by specialty
• Hospitalist Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 20, 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.