Grace E Ahn, 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.

• Virginia Hospital Center Hospital · Arlington, VA · listed as Virginia Hospital Center Physician Group LLC

Colleagues at Arthritis and Rheumatism Associates PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 56 clinicians in the practice; 12 are shown here.

• Ashley Beall, MD Rheumatology Physician · Rockville, MD
• Taylor Cheripko Physician Assistant · Rockville, MD
• Joshua Paul Costa, PTDPT Physical Therapist · Rockville, MD
• Dr. Shari B Diamond, MD Rheumatology Physician · Washington, DC
• Dr. Rachel Kaiser, MD, MPH Rheumatology Physician · Chevy Chase, MD
• Nitasha Kumar, MD Rheumatology Physician · Rockville, MD
• Grant H. Louie, MD Rheumatology Physician · Frederick, MD
• Katherine Ann Maher, MD Rheumatology Physician · Frederick, MD
• Jeffrey A. Potter, MD Rheumatology Physician · Silver Spring, MD
• Dr. Nicole Marie Saddic Thomas, MD Rheumatology Physician · Fairfax, VA
• Dr. David Peter Wolfe, MD Rheumatology Physician · Chevy Chase, MD
• Alisha Jigish Zaveri, PA Physician Assistant · Fairfax, VA

Other providers in Rockville

• Arthritis and Rheumatism Associates PC

  Organization Rheumatology Physician · NPI 1447259866

  14995 Shady Grove Rd Ste 250, Rockville, MD 20850-8727 · (301) 942-7600

• Arthritis and Rheumatism Associates, PC

  Organization Rheumatology Physician · NPI 1295852234

  14995 Shady Grove Rd Ste 250, Rockville, MD 20850-8727 · (301) 942-7600

• Ashley Beall, MD

  Individual Rheumatology Physician · NPI 1164443511

  14995 Shady Grove Rd Ste 250, Rockville, MD 20850-8726 · (301) 942-7600

• Center for Rheumatic Diseases and Osteoporosis PA

  Organization Rheumatology Physician · NPI 1700097219

  4 Taft Ct Ste 175, Rockville, MD 20850-5578 · (301) 230-5888