Individual provider Active NPI

Kristen Elizabeth Mengwasser

  • Rheumatology Physician
  • San Francisco, CA
National Provider Identifier
1841828720
Registry record updated Apr 7, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Rheumatology PhysicianTaxonomy code 207RR0500X
License
A180354 Issued in CA
Practice address
1001 Potrero Avenue BLDG 90 FL2
San Francisco, CA 94110
Phone
(628) 206-4777
Fax
(628) 206-4257
NPI assigned
Mar 27, 2020
Sex
Female
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on Apr 7, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X A180354 CA
Rheumatology Physician 207RR0500X A180354 CA Primary

Addresses

Primary practice location

1001 Potrero Avenue BLDG 90 FL2
San Francisco, CA 94110

Mailing address

PO Box 743749
Los Angeles, CA 90074-3749
Phone (415) 514-3000

Other practice location 1

75 Francis St
Boston, MA 02115-6110
Phone (617) 732-5500

Electronic endpoints 1

TypeEndpointUseAffiliation
Direct Messaging Address kristen_mengwasser@dfci.harvard.edu Direct

Medicare participation

Medicare enrollment files
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

Enrollment IDStateProvider typePAC IDDetails
I20240715002711 CA Practitioner - RheumatologyPractitioner - Internal Medicine 5698150019 Reassigns benefits to 5 organizations

Care Compare profile

Medicare Care Compare
Specialty
RheumatologyAlso: Internal Medicine
Education
Harvard Medical School, 2020
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices

Practice addresses (Care Compare)

2540 23Rd St
FL 4
San Francisco, CA 94143-2500
Phone (628) 206-4777

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
A180354CAMDRheumatology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Eddii Care PLLC Current Accepting new patients
City & County of San Francisco Current Accepting new patients
Regents of the University of California Internal Medicine CurrentSince Jun 30, 2024 Accepting new patients
City & County of San Francisco CurrentSince Jul 15, 2024 Accepting new patients
University of California SFGH Medical Group CurrentSince Jul 1, 2025 Accepting new patients
UCSF Medical Group Business Services Internal Medicine CurrentSince Jun 30, 2024 Accepting new patients
UCSF Medical Group Business Services CurrentSince Jun 30, 2024 Accepting new patients
University of California SFGH Medical Group Current Accepting new patients
City and County of San Francisco CurrentSince Jul 15, 2024 Accepting new patients
University of California San Francisco CurrentSince Jun 30, 2024 Accepting new patients
University of California SFGH Medical Group Internal Medicine CurrentSince Jul 1, 2025 Accepting new patients
University of California San Francisco CurrentSince Jun 30, 2024 Accepting new patients
Regents of the University of California Rheumatology Past Accepting new patients
University of California San Francisco Medical Center Past Accepting new patients

Locations

400 Parnassus Ave
#A632
San Francisco, CA 94143
Phone (415) 473-1000

400 Parnassus Ave
Ste A94
San Francisco, CA 94143

1001 Potrero Ave
Rm 5H22
San Francisco, CA 94110
Phone (628) 206-4774

1001 Potrero Ave
San Francisco, CA 94110
Phone (415) 206-2305

2001 The Embarcadero
Ofc Of
San Francisco, CA 94143
Phone (628) 224-5503

2540 23rd St
Fl 4
San Francisco, CA 94143
Phone (628) 206-4777

505 Parnassus Ave
#M1480
San Francisco, CA 94143
Phone (415) 476-1528

1001 Potrero Ave
Bldg 90
San Francisco, CA 94110
Phone (415) 206-8680

505 Parnassus Ave
San Francisco, CA 94143
Phone (415) 476-9058

2330 Post St
San Francisco, CA 94115
Phone (415) 502-4444

Interoperability endpoints

  • Direct secure messaging: kmengwasser243164@direct-ucsfmedicalcenter.org

Organizations & group practices 14

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.

View all 14

Hospital & facility affiliations 2

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

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

{
    "created_epoch": "1585267200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1775520000000",
    "number": "1841828720",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 743749",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900743749",
            "telephone_number": "415-514-3000",
            "fax_number": "415-502-8175"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1001 POTRERO AVENUE BLDG 90 FL2",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "94110",
            "telephone_number": "628-206-4777",
            "fax_number": "628-206-4257"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "75 Francis St",
            "address_purpose": "LOCATION",
            "city": "Boston",
            "state": "MA",
            "postal_code": "021156110",
            "country_code": "US",
            "telephone_number": "617-732-5500",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MENGWASSER",
        "first_name": "KRISTEN",
        "middle_name": "ELIZABETH",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2020-03-27",
        "last_updated": "2026-04-07",
        "certification_date": "2026-04-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A180354",
            "primary": false
        },
        {
            "code": "207RR0500X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Rheumatology",
            "state": "CA",
            "license": "A180354",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "kristen_mengwasser@dfci.harvard.edu",
            "affiliation": "N",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "75 Francis St",
            "city": "Boston",
            "state": "MA",
            "country_code": "US",
            "postal_code": "021156110",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

Other providers in San Francisco, CA

Sources for this page

Verify at the official NPI Registry.