Dr. Louisa Ziglar, 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.

• Frederick Health Hospital Hospital · Frederick, MD · listed as Frederick Health Hospital Inc

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.

• Norhan Abdalla Physician Assistant · Rockville, MD
• Alyssa Michelle Bosso, MD Rheumatology Physician · Frederick, MD
• Dr. Albert Galdi, MD Neuromusculoskeletal Medicine & OMM Physician · Wheaton, MD
• Miss. Kiley Catherine Golden, PA-C Physician Assistant · Washington, DC
• Blake Leibowitz, PA-C Physician Assistant · Rockville, MD
• Nicholas McGarry Physical Therapist · Washington, DC
• Charles Oshinsky, MD Rheumatology Physician · Chevy Chase, MD
• Laura Ashley Robbins, PA-C Physician Assistant · Chevy Chase, MD
• Dr. Evan L Siegel, MD Rheumatology Physician · Rockville, MD
• Alexander Thompson, PT, DPT Physical Therapist · Silver Spring, MD
• Katelyn Weeks Mills Physical Therapist · Wheaton, MD
• Dr. Angus Brennan Worthing, MD Rheumatology Physician · Washington, DC

Other providers in Frederick

• Hagerstown Rheumatology Associates, LLC

  Organization Rheumatology Physician · NPI 1386804300

  7115 Guilford Dr Ste 204, Frederick, MD 21704-5236 · (301) 663-6255

• Grant H. Louie, MD

  Individual Rheumatology Physician · NPI 1306013214

  161 Thomas Johnson Dr Ste 250, Frederick, MD 21702-4958 · (301) 942-7600

• Katherine Ann Maher, MD

  Individual Rheumatology Physician · NPI 1225353865

  161 Thomas Johnson Dr Ste 250, Frederick, MD 21702-4958 · (301) 942-7600

• Nathan Wei MD PA

  Organization Rheumatology Physician · NPI 1770680779

  71 Thomas Johnson Dr, Frederick, MD 21702 · (301) 694-5800