Primary Care

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MedStar Medical Group at Olney Professional Park has been awarded recognition by the National Committee for Quality Assurance Patient-Centered Medical Home™ (PCMH™ Level 3). This recognition demonstrates that the practice has the tools, systems, and resources to provide our patients with the right care at the right time.

NCQA Patient Centered Home

Patient-Centered Medical Home™ is a trademark of the National Committee for Quality Assurance.

Primary Care Doctor Patients

Primary Care from MedStar Medical Group at Olney Professional Park

At MedStar Medical Group at Olney Professional Park, we provide comprehensive and compassionate services, close to where you live and work. Our physicians are board-certified in internal medicine or family medicine. We also have endocrinology services available. We provide comprehensive and compassionate care for our patients.

We accept most major healthcare insurance plans. If you do not see our name in your provider directory, please call your insurance carrier.

We offer an extensive range of services for patients of all ages. Whether you need a medical evaluation or are feeling ill, our expert providers are there to help. Some of the services provided include:

  • Annual physicals and sports physicals
  • Auto accident injury evaluation
  • Cold care
  • Ear infection care
  • Flu and flu symptom care
  • Geriatrics
  • Men’s health exams
  • Preoperative consultations
  • Preventive medicine
  • Sleep disorder care
  • Sexually transmitted disease care
  • Urinary tract infection care
  • Vaccines
  • Weight loss assistance
  • Well woman exams
  • Wellness exams

You’ll always have the best in primary care close by whenever you or your loved one needs it. And with MedStar locations throughout Maryland and the Washington, D.C., region, you’ll also have access to the extraordinary resources of a nationally renowned health system—including 10 hospitals, hundreds of sites of service, thousands of MedStar specialists and other providers, the most advanced medical technologies, innovative treatments, the latest research, clinical trials, and much more.

Meet Our Team


Mary Ellen Ritchie, MD

Mary Ritchie, MD
Family Medicine

Syeda Batool Moosvi, MD
Internal Medicine

Robin Martinez, NP
Internal Medicine

Claudia Morrison, RD
Registered Dietician

Mohammad Ahmad Safdar Ali, MD
Internal Medicine

Niemah Chapman, CRNP
Family Medicine



Office Information:

2901 Olney-Sandy Spring Rd
Olney, MD 20832

Phone Number: 301-774-6655

Hours of Operation: Monday-Friday 8 a.m. to 5 p.m.

Phone Hours: Monday - Friday 8:30 a.m. to 4:30 p.m.


  • See all of our locations
  • To learn more about how we handle phone calls, appointments, emergency closings, laboratory results, medical records and more, click here.

Did You Know? We offer urgent care at locations throughout Maryland and the Washington, D.C. region. Click here to find an urgent care center.

Ride With Uber

We have partnered with Uber to create a convenient ride option to get you to and from your appointments. Set a reminder and you will receive a text message when it is time to hail your ride.