KARLEN ULUBABYAN MD
NPI 1376121947
Hospitalist in Los Angeles, CA
About Karlen Ulubabyan Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KARLEN ULUBABYAN MD (NPI 1376121947) is an individual hospitalist provider in Los Angeles, California, licensed in California (A193511) and active in the NPI registry since April 2021. He is enrolled in Medicare PECOS, is affiliated with New York-presbyterian Hospital, and is a graduate of University Of California, San Diego School Of Medicine (2021).
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Karlen Ulubabyan Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Karlen Ulubabyan reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Los Angeles, CA 90095
- Reassigned Medicare billing, California enrollment
- 1,766 clinicians in this Medicare group
New York, NY 10013
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Weill Medical College Of Cornell
- 980 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
New York-Presbyterian Hospital
Acute Care Hospitals · New York, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90095 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Karlen Ulubabyan's NPI number?
The NPI number for Karlen Ulubabyan is 1376121947. It was assigned to this individual provider in the NPPES registry on April 1, 2021.
Where is Karlen Ulubabyan located?
Karlen Ulubabyan practices at 757 Westwood Plz Ste 7501, Los Angeles, CA 90095. The listed phone number is (310) 267-9643.
What is Karlen Ulubabyan's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Karlen Ulubabyan enrolled in Medicare?
Yes. Karlen Ulubabyan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Karlen Ulubabyan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karlen Ulubabyan reassigns Medicare benefits to 2 organizations: The Regents Of The University Of California (Los Angeles, CA) and Weill Medical College Of Cornell University (New York, NY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Karlen Ulubabyan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Karlen Ulubabyan affiliated with any hospitals?
According to CMS data, Karlen Ulubabyan is affiliated with New York-Presbyterian Hospital.
When was this NPI record last updated?
The NPPES record for Karlen Ulubabyan was last updated on August 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Karlen Ulubabyan, MD · NPI 1376121947
Hospitalist physician in Los Angeles, California. Individual provider, active in the CMS NPPES registry since April 1, 2021.
## Identity
- **NPI:** 1376121947 (Entity type: Individual)
- **Enumerated:** April 1, 2021
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** A193511 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 757 WESTWOOD PLZ STE 7501, Los Angeles, CA 90095-8358
- **Phone:** (310) 267-9643 · **Fax:** (310) 267-3840
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): The Regents Of The University Of California (NPI 1235107566, Los Angeles, CA); Weill Medical College Of Cornell University (NPI 1801188313, New York, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Diego School Of Medicine, class of 2021
## Record status
- **NPPES last updated:** August 4, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1376121947) · Data from the CMS NPPES public registry.