Maria Lisa O'Brien, M.D.
Family Medicine Physician · Leonardtown, MD
Maria Lisa O'Brien, M.D. is a family medicine physician with a practice address in Leonardtown, Maryland, and NPI 1366429011, issued on Dec 23, 2005. Check the license (Maryland D82534, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Maria Lisa O'Brien
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- D82534 MD
25649 AL
C53909 CA
Self-reported in NPPES; status is on the state search - Practice location
- 41680 Miss Bessie Dr Ste 301, Leonardtown, MD 20650
- Phone
- (301) 997-0055
- Enumerated
- Dec 23, 2005
- Record last updated
- Jan 24, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (301) 997-0066
- Medicare enrollment
- Enrolled (PECOS I20260520001763); may accept Medicare assignment
- Medical or professional school
- Creighton University School Of Medicine, 2002
- Entity
- Type 1 · individual
Also registered at 41680 Miss Bessie Dr Ste 301
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Stephenie Gutridge-Snode, MSN, CRNPFamily Nurse Practitioner1457081838
- Sherry HaubertFamily Nurse Practitioner1740961317
- Ashley O'Neil, CRNPFamily Nurse Practitioner1326577065
- Kathryn Sterling, APRNNurse Practitioner1730707456
Verify Maria Lisa O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D82534Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average family medicine physician in 2024
431 Medicare Part D claims for 145 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium33 claims
- Amlodipine Besylate23 claims
- Levothyroxine Sodium22 claims
- Omeprazole17 claims
- Losartan Potassium15 claims
- Rosuvastatin Calcium14 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 80.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
9 family medicine physician records list a practice address in Leonardtown
They are 9 of the 471 NPPES records with a practice address in Leonardtown, and 1,912 family medicine physician records in Maryland.
All 9 in Leonardtown → All 1,912 in Maryland → Every provider in Leonardtown →
Other family medicine physician records in Maryland
- Amelia Abban, CRNP-BCLaurel, MD1023761970
- Peter Abbott, MDWillards, MD1982603759
- Hanan Aboumatar, MD, MPHBaltimore, MD1437526746
- Ndubuisi Achufusi, M.D.Greenbelt, MD1124057260
- Jose Acol, MDMount Airy, MD1801890306
- Phyllis Acquah, M.D.Silver Spring, MD1285996868
- Charles Adamo, M.D.Annapolis, MD1063437358
- Gillian Adams, M.D.Bel Air, MD1912086794
- Jerry Adams, M.D.Lavale, MD1710088265
- Ifeoluwa AdekanyeDundalk, MD1699419804
Common questions
What is Maria Lisa O'Brien, M.D.'s NPI number?
Maria Lisa O'Brien, M.D.'s National Provider Identifier (NPI) is 1366429011, issued on Dec 23, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Maria Lisa O'Brien, M.D. located?
The NPPES record lists a practice address at 41680 Miss Bessie Dr Ste 301, Leonardtown, MD, 20650. Phone: (301) 997-0055. Providers update this record themselves, so call before visiting.
How can I verify Maria Lisa O'Brien, M.D.'s license?
NPPES lists Maryland license number D82534, 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 Maria Lisa O'Brien, M.D. prescribe under Medicare Part D?
In 2024, Maria Lisa O'Brien, M.D. had 431 Medicare Part D claims for 145 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Maria Lisa O'Brien, M.D.'s MIPS final score?
The 2023 MIPS final score is 80.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.