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Rheumatologists who accept Medicare in Frederick, MD
CMS lists 19 clinicians in this specialty with a practice address in Frederick. Accept Medicare assignment (the Medicare-approved amount as full payment): 19. Offer telehealth: 16.
Typical amounts Medicare approves in ZIP 21702 (2024 Medicare rates, the latest CMS has published): a new-patient visit $133, of which you pay about $33; a follow-up visit $102, of which you pay about $26 — the 20% coinsurance after the yearly Part B deductible. Clinicians who don't accept assignment can charge up to 15% more; with a Medicare Advantage plan, your plan's copay applies instead.
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Order: clinicians who accept assignment first, then by MIPS score (highest first), then by last name.
Moe Zan, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90/100✓ TelehealthGraduated 1998FemaleDrug and device company payments (2025): $4,606Grace E. Ahn, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 2006 · University of Virginia School of MedicineFemaleDrug and device company payments (2025): $18Ashley D. Beall, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 1999 · Medical College of Georgia School of MedicineFemaleOther offices in Frederick: 2Drug and device company payments (2025): $38Adey Berhanu, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 2011 · University of Illinois College of Med (chi/peor/rock/chm-Urb)FemaleDrug and device company payments (2025): $19Daniel Elbogdadi, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 2001 · George Washington University School of MedicineMaleDrug and device company payments (2025): $5,215Rami Eltaraboulsi, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 2020 · University of North Carolina at Chapel Hill School of MedicineMaleOther offices in Frederick: 2Drug and device company payments (2025): $391Nitasha Kumar, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 2014FemaleDrug and device company payments (2025): $54Grant H. Louie, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 2001 · Hahnemann University College of MedicineMaleOther offices in Frederick: 2Katherine A. Maher, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 2010 · Georgetown University School of MedicineFemaleOther offices in Frederick: 2Drug and device company payments (2025): $117Charles Oshinsky, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 2017 · New York University School of MedicineMaleDrug and device company payments (2025): $6,377Justin Peng, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 2005 · Boston University School of MedicineMaleDrug and device company payments (2025): $19Jeffrey A. Potter, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 2006 · Howard University College of MedicineMaleDrug and device company payments (2025): $436Guada R. Respicio Duque, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.7/100✓ TelehealthGraduated 2004FemaleDrug and device company payments (2025): $314Neeti Bhargava, MD
✓ Accepts Medicare assignmentGraduated 1993FemaleOther offices in Frederick: 1Drug and device company payments (2025): $366Alyssa Bosso, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2020 · Georgetown University School of MedicineFemaleDrug and device company payments (2025): $15Mary Romanic, MD
✓ Accepts Medicare assignmentGraduated 2000 · University of South Carolina School of MedicineFemaleDrug and device company payments (2025): $947Eva Rottmann, DO
✓ Accepts Medicare assignment✓ TelehealthGraduated 2015 · Lake Erie Col of Osteopathic Medicine, BradentonFemaleDrug and device company payments (2025): $176Enrico T. Villanueva, MD
✓ Accepts Medicare assignmentGraduated 1989MaleOther offices in Frederick: 1Drug and device company payments (2025): $2,196Louisa Ziglar, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2002 · State University of New York Downstate Medical CenterFemaleOther offices in Frederick: 3Drug and device company payments (2025): $118
Before you book
This list comes from Medicare's enrollment records, not from reviews. Call the office to confirm the clinician is taking new Medicare patients. With Original Medicare, a clinician who accepts assignment can only charge you the Medicare deductible and coinsurance; one who doesn't may charge up to 15% more than the Medicare-approved amount. If you have a Medicare Advantage plan, check that the clinician is in the plan's network.
The MIPS final score (0–100) comes from Medicare's Merit-based Incentive Payment System for 2024. It combines quality measures, cost, improvement activities and use of certified health records, and it sets a payment adjustment. Clinicians who report as a group share the group's score. It is not a patient rating, and many clinicians have no published score.
Payments from drug and medical device companies come from CMS Open Payments (2025 general payments: meals, travel, consulting and speaking fees, gifts and similar), summed for each clinician. Receiving payments is legal and common and does not mean a clinician did anything wrong.
Other specialists in Frederick
- Primary care doctors232
- Geriatricians3
- Nurse practitioners391
- Cardiologists53
- Dermatologists17
- Orthopedic surgeons102
- Neurologists30
- Gastroenterologists27
- Ophthalmologists26
- Optometrists26
- Podiatrists33
- Urologists7
- Pulmonologists10
- Nephrologists3
- Endocrinologists8
- ENT doctors8
- Oncologists10
- Psychiatrists18
- Psychologists27
- Therapists and counselors162
- Physical therapists193
- Occupational therapists15
- Audiologists8
- Chiropractors25
- Gynecologists74
- General surgeons16
- Vascular surgeons9
- Pain management doctors4
- Physiatrists11
- Allergists8
- Dietitians5
- Neurosurgeons11
- Infectious disease doctors4
Other care in Frederick
Hospitals · Nursing homes · Dialysis centers · Home health agencies · Hospices
Nearby cities
Enrollment, addresses and scores are as reported to CMS and can change. This is not a list of in-network providers for any Medicare Advantage plan, and it is not medical advice. Source: CMS Provider Data Catalog — Doctors and Clinicians National Downloadable File, Clinician MIPS Performance 2024 and Facility Affiliation Data (released Oct 2, 2026).