Vernissia Tam, MD

Medicare activity in 2024

Official CMS public-use data for Vernissia Tam, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Diagnostic exam of anus using an endoscope (46600)67 services
2. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)61 services
3. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)58 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)29 services
5. New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)13 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure75%
• High cholesterol75%
• Arthritis55%
• Ischemic heart disease36%
• Diabetes32%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)32%

Hospitals where Vernissia Tam works

Medicare's Facility Affiliation Data lists Vernissia Tam at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Frederick Health HospitalFrederick, MD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 210005

Practice locations

Addresses where Vernissia Tam is enrolled with Medicare (CMS data updated October 2, 2026).

• 504 E Ridgeville BlvdMount Airy, MD 21771 (240) 215‑6310

Group practices

Medicare enrollment lists Vernissia Tam as a member of this group (CMS data updated October 2, 2026).

• Frederick Health Medical Group LLC199 clinicians in the group

Specialties

• Colorectal Surgery (Proctology)primary

Find other Colorectal Surgery (Proctology) doctors in Maryland →

Other colorectal surgeons in Maryland

Clinicians with the same Medicare primary specialty in Maryland — not a recommendation.

• Steven G. Proshan, MD
• Mari A. Madsen, MD
• Maria Kiely, MD
• Ricardo Patton U. Po, MD
• Irina Bernescu, MD
• Justin C. Somerville, MD
• Jeffery M. Nelson, MD
• Andrea C. Bafford, MD

All colorectal surgeons in Maryland →

Other clinicians in Frederick Health Medical Group LLC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• B A. Shanes, MD
• Lucas Couch, DO
• Nazish Syed, PA
• Amy J. McGreevy, NP
• Ravi Patel, MD
• Syed K. Mahmood, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians