NPIMap

Individual provider Active NPI

Tianyu Chen, MD

  • Internal Medicine Physician
  • Orange, CA
National Provider Identifier
1164927463
Registry record updated Sep 10, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
A165639 Issued in CA
Practice address
101 The City Dr S
Orange, CA 92868-3201
Phone
(714) 456-8888
NPI assigned
Mar 28, 2018
Last updated
Sep 10, 2025By the provider in NPPES
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Sep 10, 2025

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 A165639 CA Primary
Hospitalist Physician 208M00000X A165639 CA

Addresses

Primary practice location

101 The City Dr S
Orange, CA 92868-3201

Mailing address

5767 W Century Blvd Ste 400
Los Angeles, CA 90045-5631
Phone (310) 301-8707

Other practice location 1

505 Parnassus Ave
San Francisco, CA 94143
Phone (415) 476-7931

Other practice location 2

757 Westwood Plz Ste 7501
Los Angeles, CA 90095-8358
Phone (310) 319-4698

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20210901002926 CA Practitioner - HospitalistPractitioner - Internal Medicine 6406267178 Reassigns benefits to 4 organizations

Care Compare profile

Medicare Care Compare
Specialty
HospitalistAlso: Internal Medicine
Education
Other, 2018
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
The Regents of the University of California-IrvineGroup PAC ID 3971609611, 116 clinicians

Practice addresses (Care Compare)

101 The City Dr S
Orange, CA 92868-3201
Phone (714) 456-7890

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
87.51 of 100Reported as group
Quality
79.37
Promoting interoperability
100
Improvement activities
40
Cost
73.65

Merit-based Incentive Payment System (MIPS)

Final score
87.01 of 100Reported as group
Quality
86.78
Improvement activities
40
Cost
70.46

Merit-based Incentive Payment System (MIPS)

Final score
100 of 100Reported as group
Quality
95
Improvement activities
40
Cost
80.65

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
A165639CAMDHospitalist Physician

Practice roles

OrganizationSpecialtyStatusNew patients
The Regents of the University of California-Irvine Hospitalist CurrentSince Oct 1, 2025 Accepting new patients
University of California San Francisco Internal Medicine CurrentSince Aug 26, 2021 Accepting new patients
UCSF Medical Group Business Services CurrentSince Aug 26, 2021 Accepting new patients
UCSF Medical Group Business Services Internal Medicine CurrentSince Aug 26, 2021 Accepting new patients
University of California San Francisco CurrentSince Aug 26, 2021 Accepting new patients
Regents of the University of California Internal Medicine CurrentSince Aug 26, 2021 Accepting new patients
University of California San Francisco Current Accepting new patients
University of California Irvine Past Accepting new patients

Locations

101 The City Dr S
Orange, CA 92868
Phone (714) 456-6054

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

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

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

Organizations & group practices 8

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

Hospital & facility affiliations 4

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": "1522195200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757462400000",
    "number": "1164927463",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5767 W CENTURY BLVD STE 400",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900455631",
            "telephone_number": "310-301-8707"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "101 THE CITY DR S",
            "city": "ORANGE",
            "state": "CA",
            "postal_code": "928683201",
            "telephone_number": "714-456-8888"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "505 Parnassus Ave",
            "address_purpose": "LOCATION",
            "city": "San Francisco",
            "state": "CA",
            "postal_code": "94143",
            "country_code": "US",
            "telephone_number": "415-476-7931",
            "fax_number": "415-476-4818",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "757 Westwood Plz Ste 7501",
            "address_purpose": "LOCATION",
            "city": "Los Angeles",
            "state": "CA",
            "postal_code": "900958358",
            "country_code": "US",
            "telephone_number": "310-319-4698",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "CHEN",
        "first_name": "TIANYU",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2018-03-28",
        "last_updated": "2025-09-10",
        "certification_date": "2025-09-10",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A165639",
            "primary": true
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "CA",
            "license": "A165639",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Orange, CA

Sources for this page

Verify at the official NPI Registry.