Margaret Brennan, M.D.
NPI 1851489207 · Cardiovascular Disease Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Brennan, M.D. is a Cardiovascular Disease Physician provider in Baltimore, MD (NPI 1851489207).
Provider details
- NPI number
- 1851489207
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 15409 (TN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-11
- Last updated
- 2022-09-14
- Certified
- 2022-09-14
Frequently asked questions
- What is Margaret Brennan's NPI number?
- Margaret Brennan's National Provider Identifier (NPI) is 1851489207, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Brennan's specialty?
- Margaret Brennan is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Brennan located?
- Margaret Brennan's practice location on file with NPPES is 6569 N Charles St, Baltimore, MD 21204-6831.
- What is Margaret Brennan's phone number?
- The practice phone number listed in the NPPES registry for Margaret Brennan is (443) 849-8989.
- Does Margaret Brennan accept Medicare?
- Margaret Brennan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Brennan's NPI active?
- Yes — Margaret Brennan's NPI (1851489207) is active in the NPPES registry as of the last update on 2022-09-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.