DR. CATHLEEN NOEL BAIREY MERZ M.D.
NPI 1447238324
Internal Medicine - Cardiovascular Disease in Los Angeles, CA
About Dr. Cathleen Noel Bairey Merz M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CATHLEEN NOEL BAIREY MERZ M.D. (NPI 1447238324) is an individual cardiovascular disease provider in Los Angeles, California, licensed in California (G49670) and active in the NPI registry since January 2006. She is enrolled in Medicare PECOS and is a graduate of Harvard Medical School (1981).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
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
Dr. Cathleen Noel Bairey Merz M.d. 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 Reassignment
Medicare enrollment records show Cathleen Bairey Merz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Los Angeles, CA 90048
- Reassigned Medicare billing, California enrollment
- 1,001 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 3
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90048 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
LOS ANGELES, CA 90048
LOS ANGELES, CA 90048
LOS ANGELES, CA 90048
LOS ANGELES, CA 90048
LOS ANGELES, CA 90048
LOS ANGELES, CA 90048
LOS ANGELES, CA 90048
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 Cathleen Bairey Merz's NPI number?
The NPI number for Cathleen Bairey Merz is 1447238324. It was assigned to this individual provider in the NPPES registry on January 3, 2006.
Where is Cathleen Bairey Merz located?
Cathleen Bairey Merz practices at 444 S San Vicente Blvd Suite 600, Los Angeles, CA 90048. The listed phone number is (310) 423-9680.
What is Cathleen Bairey Merz's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.
Is Cathleen Bairey Merz enrolled in Medicare?
Yes. Cathleen Bairey Merz 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 organization bills Medicare for Cathleen Bairey Merz's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Cathleen Bairey Merz reassigns Medicare benefits to Cedars-Sinai Medical Center (Los Angeles, CA). The 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 Cathleen Bairey Merz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Cathleen Bairey Merz was last updated on August 12, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years 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.
# Dr. Cathleen Noel Bairey Merz, M.D. · NPI 1447238324
Cardiovascular Disease physician in Los Angeles, California. Individual provider, active in the CMS NPPES registry since January 3, 2006.
## Identity
- **NPI:** 1447238324 (Entity type: Individual)
- **Enumerated:** January 3, 2006
- **Primary specialty:** Internal Medicine - Cardiovascular Disease · taxonomy 207RC0000X
- **State license:** G49670 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 444 S SAN VICENTE BLVD, SUITE 600, Los Angeles, CA 90048-4165
- **Phone:** (310) 423-9680 · **Fax:** (310) 423-9681
## 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:** Cedars-Sinai Medical Center (NPI 1639172372, Los Angeles, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 1981
## Record status
- **NPPES last updated:** August 12, 2014
- **Other identifiers:** Medicare UPIN E49271 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1447238324) · Data from the CMS NPPES public registry.