Mary Elizabeth Brennan, M.D.
Family Medicine Physician · Crownsville, MD
Mary Elizabeth Brennan, M.D. is a family medicine physician with a practice address in Crownsville, Maryland, and NPI 1952468670, issued on Jan 2, 2007. Check the license (Maryland D0095712, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Mary Elizabeth Brennan
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- D0095712 MD
94-199 NM
Self-reported in NPPES; status is on the state search - Practice location
- 1454 Fairfield Loop RD, Crownsville, MD 21032
- Phone
- (410) 987-6338
- Enumerated
- Jan 2, 2007
- Record last updated
- Feb 9, 2023
- Medicaid ID
- J2527 NM
- Medicare enrollment
- Enrolled (PECOS I20040129000247); accepts Medicare assignment
- Medical or professional school
- State University Of New York At Stony Brook, School Of Medicine, 1993
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 1,912 in Maryland → Look up another NPI →
Also registered at 1454 Fairfield Loop RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lakshmi Chillakuru, M.DFamily Medicine Physician1184810905
- Patricia Deltuva, PTAPhysical Therapy Assistant1730212945
- Daniel Duvall, DPTPhysical Therapist1457819302
- Lisa MersonPhysical Therapist1679031439
- Kayla PhippinOccupational Therapy Assistant1679267058
- Stephanie RayOccupational Therapist1215290887
Verify Mary Elizabeth Brennan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D0095712Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average family medicine physician in 2024
694 Medicare Part D claims for 97 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Gabapentin49 claims
- Lisinopril38 claims
- Amlodipine Besylate34 claims
- Atorvastatin Calcium28 claims
- Metoprolol Succinate25 claims
- Armour Thyroid24 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $20.60
1 payment: food and beverage; the largest payer was Pfizer Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Cura HealthcareAlbuquerque, NM
- Southwest Medical Associates, LLCAlbuquerque, NM
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Elizabeth Brennan among 1,912 family medicine physician records in Maryland
Mary Elizabeth Brennan, M.D. is one of 1,912 family medicine physician records with a practice address in Maryland. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 42% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1993 · median 2004 among the 1,141 with a school on file
- Record last updated2023 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 family medicine physician records list a practice address in Crownsville
They are 3 of the 82 NPPES records with a practice address in Crownsville, and 1,912 family medicine physician records in Maryland.
All 1,912 in Maryland → Every provider in Crownsville → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Lakshmi Chillakuru, M.DCrownsville, MD 210321184810905
- Carmen Hiller, MDCrownsville, MD 210321891868113
- Olufunto Campbell, MDHunt Valley, MD 210311184186710
- Charles Clifton, DOHunt Valley, MD 210311912240904
- Ndifreke Enyeama, FNPHunt Valley, MD 210311295388783
- Robin Motter-Mast, M.D.Hunt Valley, MD 210311902853955
- Omasirichiokike Okogbule-Wonodi, MDHunt Valley, MD 210311730819301
- Matthew Silver, M.D.Hunt Valley, MD 210311437567864
Common questions
What is Mary Elizabeth Brennan, M.D.'s NPI number?
Mary Elizabeth Brennan, M.D.'s National Provider Identifier (NPI) is 1952468670, issued on Jan 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mary Elizabeth Brennan, M.D. located?
The NPPES record lists a practice address at 1454 Fairfield Loop RD, Crownsville, MD, 21032. Phone: (410) 987-6338. Providers update this record themselves, so call before visiting.
How can I verify Mary Elizabeth Brennan, M.D.'s license?
NPPES lists Maryland license number D0095712, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mary Elizabeth Brennan, M.D. prescribe under Medicare Part D?
In 2024, Mary Elizabeth Brennan, M.D. had 694 Medicare Part D claims for 97 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.