Cathleen Bairey Merz, M.D.
NPI 1447238324 · Cardiovascular Disease Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cathleen Bairey Merz, M.D. is a Cardiovascular Disease Physician provider in Los Angeles, CA (NPI 1447238324).
Provider details
- NPI number
- 1447238324
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- G49670 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
311 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 246 | $103 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 38 | $154 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 27 | $142 |
Typical Medicare-allowed amounts for these services range $103–$154 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 24 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Rosuvastatin Calcium | 91 | 33 |
| Amlodipine Besylate | 73 | 28 |
| Losartan Potassium | 48 | 26 |
| Ezetimibe | 37 | 17 |
| Telmisartan | 35 | 13 |
| Atorvastatin Calcium | 32 | 18 |
| Ramipril | 29 | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$223,873 across 34 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-03
- Last updated
- 2014-08-12
Frequently asked questions
- What is Cathleen Bairey Merz's NPI number?
- Cathleen Bairey Merz's National Provider Identifier (NPI) is 1447238324, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cathleen Bairey Merz's specialty?
- Cathleen Bairey Merz is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Cathleen Bairey Merz located?
- Cathleen Bairey Merz's practice location on file with NPPES is 444 S San Vicente Blvd, Los Angeles, CA 90048-4165.
- What is Cathleen Bairey Merz's phone number?
- The practice phone number listed in the NPPES registry for Cathleen Bairey Merz is (310) 423-9680.
- Does Cathleen Bairey Merz accept Medicare?
- Cathleen Bairey Merz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cathleen Bairey Merz's NPI active?
- Yes — Cathleen Bairey Merz's NPI (1447238324) is active in the NPPES registry as of the last update on 2014-08-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.