Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Maria Lisa O'Brien, MD

Individual provider Family Medicine Physician · NPI 1366429011

Dr. Maria Lisa O'Brien, MD is registered under Family Practice in Leonardtown, Maryland. Graduated from Creighton University School of Medicine in 2002, 24 years ago. Licensed in Alabama, California and Maryland.

Years since qualifying
24
Trained at
Creighton University School of Medicine
Licensed in
AL, CA, MD
In the registry since
2005
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

41680 Miss Bessie Dr Ste 301
Leonardtown, MD 20650-2965
Phone: (301) 997-0055
Fax: (301) 997-0066
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence D82534 (MD)
Family Medicine Physician Taxonomy 207Q00000X · Licence 25649 (AL)
Family Medicine Physician Taxonomy 207Q00000X · Licence C53909 (CA)

Record details

NPI number1366429011
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 23, 2005
Last updated in NPPESJanuary 24, 2017

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolCREIGHTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 2002 (24 years in practice)
Accepts Medicare assignment Not indicated
Practice locations2 on file with Medicare

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