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Margaret Ann O'Reilly

About me

I was born and raised in Fairfax County, VIrginia, but practiced law in the Boston area for 25 years before returning to Northen Virignia in the fall of 2003.  I am acitve in several community and non-profit groups, and serve on the board of directors of the Herndon Rotary Club and the Council for the Arts of Herndon.


Photos and videos

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Practice areas


  1. Elder Law: 20%
  2. Estate Planning: 20%
  3. Medicaid & Medicare: 20%
  4. Probate: 20%
  5. Guardianship: 20%



Hourly ($285-350/hour), Fixed (sometimes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

4 total 

Are you an attorney? Endorse this lawyer

  • Ross Cameron Hart

    I am happy to endorse Ms. O'Reilly -- she has taught me and other lawyers some of the intricacies of our practice area and has been a leader in the field of elder law.


    Ross Hart Guardianship Attorney
    Relationship: Fellow lawyer in community

  • Rebecca Lynne Evans

    I endorse this lawyer. She is very knowledgeable in this field and is able to provide clients with assistance and guidance.


    Rebecca Evans Estate planning Attorney
    Relationship: Fellow lawyer in community

Contact info

Margaret A. O'Reilly, PC

441A Carlisle Drive
Herndon, VA, 20170


VAAuthorized to practice law200403/31/2016
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Best Lawyer - Elder LawBest Lawyers in America2014
Best Lawyers - Elder LawWshingtonian Magazine2013
Best Lawyer - Elder LawBest Lawyers in America2013
Best Lawyers -- Elder LawBest Lawyers in America2012
Best Lawers - Elder LawWashingtonian Magazine2011
Best Lawyers - Elder LawWashingtonian Magazine2009
Life FellowMassachusetts Bar Foundation2002
AV ratedMartindale-Hubbell1980
Work experience
TitleCompany nameDuration
Founder and PrincipalMargaret A. O'Reilly, PC2012 - Present
PartnerCossa, Gray and O'Reilly, PLC2008 - 2012
AssociateZell Law2007 - 2008
AssociateThe O'Reilly Law Firm2003 - 2007
PrincipalMargaret A. O'Reilly, Attorney At Law1987 - 2003
Association namePosition nameDuration
Rotary Club of HerndonBoard of Directors2012 - Present
Fairfax Bar AssociationElder Law Section2011 - Present
National Academy of Elder Law AttorneysCouncil of Advanced Practitioners2010 - Present
Virginia Academy of Elder Law AttorneysBoard of Directors2006 - Present
National Elder Law FoundationCertified Elder Law Attorney2004 - Present
National Academy of Elder Law AttorneysMember1997 - Present
Friends of Runnymede ParkBoard of Directors2007 - 2011
Publication nameTitleDate
NBIMedicare Conditional Payment Subrogation Rights2011
NBIOverview of SSI, Medicaid and SNTs to Protect Eligibility2011
NBIUsing Geriatric Care Managers2007
The Advanced PlannerWhat is Elder Law?2007
NBIVirginia Medicaid Eligibility2005
School nameMajorDegreeGraduated
Northeastern University School of LawLawJD - Juris Doctor1978
Duke UniversityN/ABA - Bachelor of Arts1972
Speaking engagements
Conference nameTitleDate
Spring ArborLegal Issues for Caregivers2014
Reston PresentsElder Law2014
Osher Lifelong Learning InstituteNavigating Life Changes Facing Seniors2014
Cascades Senior CenterLegal Issues in Transitions2014
Alzheimers Family Day CareLegal Issues for Caregivers2014
St. John Neumann Catholic ChurchEssential Legal Documents2013
Reston Community CenterLegal issues for Seniors2013
Reston Community CenterLong Term Care Issues2013
Reston Community CenterWhat is Elder Law?2013
Osher Lifelong Learning InstituteMedicare and Madicaid2013
Osher Lifelong Learning InstituteNavigating Life Changes Facing Seniors2013
Osher Lifelong Learning Institute-Medicare and Medicaid2012
Virginia Retirement SystemEssential Legal Documents2011
Reston PresentsAffordable Care Act -- Implications for Seniors2011
Reston PresentsWhat is Elder Law?2010
AAUW - Reston Branch MeetingUnderstanding Elder Care Options2010