John M Wallmark, MD

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

• Suburban Hospital Hospital · Bethesda, MD
• Adventist Home Health Services, Inc. Home health agency · Silver Spring, MD · listed as Adventist Home Health Services Inc
• Adventist Healthcare Shady Grove Medical Center Hospital · Rockville, MD
• Holy Cross Germantown Hospital Hospital · Germantown, MD

Colleagues at Maryland Oncology Hematology PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 101 clinicians in the practice; 12 are shown here.

• Dr. Courtney D Ackerman, MD Hematology & Oncology Physician · Silver Spring, MD
• Dr. Ali Abbas Bukhari, MD Hematology & Oncology Physician · Dayton, OH
• Michele Lynn Cleary, CRNP Family Nurse Practitioner · Brandywine, MD
• Dr. Sean Cronin, MD Obstetrics & Gynecology Physician · Falls Church, VA
• Marissa Davidson Nurse Practitioner · Columbia, MD
• Dr. Ari Hayim Elman, MD Hematology & Oncology Physician · Baltimore, MD
• Victoria Michaela Eskay Student in an Organized Health Care Education/Training Program · Ypsilanti, MI
• Nicholas J. Farrell, MD Hematology & Oncology Physician · Rockville, MD
• Mrs. Keisha Natasha Hinds, CRNP Family Nurse Practitioner · Brandywine, MD
• Renee W Maloney, FNP-C Family Nurse Practitioner · Rockville, MD
• Vivek A Patil, MD Surgery Physician · Bethesda, MD
• Lindsey Wise, MSW, LCSW, OSW-C Clinical Social Worker · Rockville, MD

Other providers in Rockville

• Potomac Oncology & Hematology, LLC

  Organization Hematology & Oncology Physician · NPI 1962947937

  6000 Executive Blvd Ste 501, Rockville, MD 20852-3803 · (240) 618-0275

• Rcca MD LLC

  Organization Hematology & Oncology Physician · NPI 1255894879

  9715 Medical Center Dr Ste 221, Rockville, MD 20850-6319 · (301) 774-6136

• Rcca MD LLC

  Organization Hematology & Oncology Physician · NPI 1689207920

  9715 Medical Center Dr Ste 531, Rockville, MD 20850-3310 · (301) 424-9723

• George A Sotos, MD

  Individual Hematology & Oncology Physician · NPI 1033290705

  9707 Medical Center Dr Ste 300, Rockville, MD 20850-3348 · (301) 424-6231

• Dongmei Wang, MD

  Individual Hematology & Oncology Physician · NPI 1447422431

  2401 Research Blvd Ste 370, Rockville, MD 20850-3269 · (301) 222-3615

• Dr. Farah Zeba Zia, MD

  Individual Hematology & Oncology Physician · NPI 1407011729

  6116 Executive Blvd Ste 609, Rockville, MD 20852-4920 · (301) 496-6986