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About

Summary: - The Johns Hopkins Howard County Medical Center in Columbia, MD is a nonprofit hospital affiliated with Johns Hopkins Medicine, offering a broad range of hospital and wellness services across nearly 100 clinical specialties. - It is part of Johns Hopkins Medicine, with award-winning clinical care, and employs about 224 staff. The center is headquartered in Columbia, Maryland, with a local address at 5755 Cedar Ln, Columbia, MD 21044. - Focus areas include general hospital services and specialty care within the Johns Hopkins system; however, specific hematology/oncology services are not detailed in the provided highlights. For hematology oncology in Columbia, MD, this center is a Johns Hopkins-affiliated option to explore, along with nearby Johns Hopkins-affiliated or affiliated regional programs. - Contact: 410-740-7890. Website: hopkinsmedicine.org/johns-hopkins-howard-county If you’re specifically seeking Hematology-Oncology services at Johns Hopkins in Columbia, consider confirming: - Whether the center offers a dedicated hematology/oncology clinic or cancer center within Howard County. - Availability of Johns Hopkins Medicine Oncology/Tumor Board services, clinical trials, and hematology-oncology specialists in the Columbia area.

Clinic Type

Hematology

Address

9905 Medical Center Drive, Shady Grove Medical Building Suite200, Rockville, MD 20850

Phone

301-424-6231

Email

Opening Hours

Not published — contact the clinic to confirm hours.

Services Offered

Team

  • John M Wallmark, MD — Hematology Oncology
  • Shannon Courtney O'Connor, MD — Hematology Oncology
  • George Aristides Sotos, MD — Hematology Oncology
  • Syed Shahid Mahmood, MD — Hematology, Hematology Oncology
  • Ravin Jain Garg, MD — Hematology Oncology, Medical Oncology
  • Maitri Kalra, MBBS — Breast Medical Oncology, Hematology Oncology, Medical Oncology
  • Roy Elias, MD — Hematology Oncology, Medical Oncology
  • Helen Catherine Wilbur, MD — Hematology Oncology, Medical Oncology
  • Tanya Michelle Prowell, MD — Hematology Oncology, Medical Oncology
  • Adel Mandl, MD, PhD — Hematology Oncology, Medical Oncology
  • Tania Jain, MBBS — Hematology Oncology
  • Samantha L. Vogt, MD, MPH — Hematology, Hematology Oncology, Medical Oncology

Insurance & Payment

Languages Spoken

Photos

What Patients Say

Overall sentiment across review platforms: positive

  • Johns Hopkins Medicine Provider Profiles, US News Health, Vitals: Generally 4.0 to 5.0 out of 5 stars for individual physicians on platforms like Johns Hopkins provider profiles and US News Health. (Varies significantly by provider, ranging from a few reviews to over 300 for some established specialists.)

Patients praise

  • High patient satisfaction ratings (often 4-5 stars) for individual providers affiliated with Johns Hopkins and related oncology practices in Columbia.
  • Staff praised for being kind, knowledgeable, and caring.
  • Professional and efficient clinical environment.

Common complaints

  • Some providers associated with academic institutions may have metrics based on institutional averages (e.g., MIPS scores) rather than specific patient complaints.

"Staff knowledgeable kind and seems to actually care about the pt. and never made me feel like I was a bother. As a retired nurse I am sensitive to how the health care profession treats patients and I was very pleased to put my life in the hands of the people working here."

Vitals patient review for a Columbia, MD based oncologist.

Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 11, 2026.

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Maryland Oncology Hematology (MOH) is a large, physician-led cancer care network in Maryland, founded in 1986. It operates 13+ locations with over 60 physicians and 400+ staff, serving 50,000+ patients. The Columbia area is a key site, with MOH providers seeing patients in Columbia and surrounding areas (e.g., Eldersburg). Services span medical oncology, hematology, radiation oncology, genetics, clinical research, behavioral health, and surgical specialties. The HQ is in Beltsville, MD, with multiple offices statewide, including Columbia (Columbia address: 10710 Charter Dr, G020, Columbia, MD 21044). If you’re seeking a cancer center in Columbia, MOH offers multidisciplinary oncology care, access to advanced treatments, and a growing team of specialists.

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