NPIMap

Individual provider Active NPI

Karlen Ulubabyan, MD

  • Hospitalist Physician
  • Los Angeles, CA
National Provider Identifier
1376121947
Registry record updated Aug 4, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Hospitalist PhysicianTaxonomy code 208M00000X
License
A193511 Issued in CA
Practice address
757 Westwood PLZ Ste 7501
Los Angeles, CA 90095-8358
Phone
(310) 267-9643
Fax
(310) 267-3840
NPI assigned
Apr 1, 2021
Last updated
Aug 4, 2026By the provider in NPPES
Sex
Male
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on Aug 4, 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 A195311 CA
Hospitalist Physician 208M00000X A193511 CA Primary

Addresses

Primary practice location

757 Westwood PLZ Ste 7501
Los Angeles, CA 90095-8358

Mailing address

5767 W Century Blvd Ste 400
Los Angeles, CA 90045-5631

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in NY, CA2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20241106001456 NY Practitioner - HospitalistPractitioner - Internal Medicine 3072047562 Reassigns benefits to 1 organization
I20260623000411 CA Practitioner - HospitalistPractitioner - Internal Medicine 3072047562

Care Compare profile

Medicare Care Compare
Specialty
HospitalistAlso: Internal Medicine
Education
University of California, San Diego School of Medicine, 2021
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Weill Medical College of CornellGroup PAC ID 6800709023, 2,023 clinicians

Practice addresses (Care Compare)

525 E 68TH St
New York, NY 10065-4870
Phone (646) 962-3376

Hospital & facility affiliations

National Provider Directory

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

Practice roles

OrganizationSpecialtyStatusNew patients
Weill Medical College of Cornell Single Specialty Current Accepting new patients
Weill Medical College of Cornell Single Specialty CurrentSince Aug 19, 2024 Accepting new patients
Weill Medical College of Cornell Single Specialty CurrentSince Aug 19, 2024 Accepting new patients
The Regents of the University of California Single Specialty PastSince Jul 1, 2015 Accepting new patients
The Regents of the University of California Past Accepting new patients
The New York and Presbyterian Hospital Past Accepting new patients

Locations

1305 York Ave
Fl 8
New York, NY 10021
Phone (646) 962-3176

170 William St
New York, NY 10038
Phone (212) 238-0100

525 E 68th St
New York, NY 10065
Phone (212) 746-2846

525 E 68th St
#5
New York, NY 10065
Phone (212) 746-2771

Networks

  • Healthfirst Medicare Network H5989
  • Healthfirst Medicare Network H1722
  • Healthfirst Medicare Network H9678
  • Healthfirst Medicare Network H3359

Interoperability endpoints

  • FHIR API: https://epicproxy-pub.et1089.epichosted.com/FHIRProxy/api/FHIR/DSTU2/
  • FHIR API: https://epicproxy-pub.et1089.epichosted.com/FHIRProxy/api/FHIR/R4/
  • Direct secure messaging: kau4003@direct.nyp.org

Organizations & group practices 6

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 7

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": "1617235200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1785801600000",
    "number": "1376121947",
    "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"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "757 WESTWOOD PLZ STE 7501",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900958358",
            "telephone_number": "310-267-9643",
            "fax_number": "310-267-3840"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ULUBABYAN",
        "first_name": "KARLEN",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2021-04-01",
        "last_updated": "2026-08-04",
        "certification_date": "2026-08-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A195311",
            "primary": false
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "CA",
            "license": "A193511",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Los Angeles, CA

Sources for this page

Verify at the official NPI Registry.