William G. Tsiaras, MD

Medicare activity in 2024

Official CMS public-use data for William G. Tsiaras, 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. Destruction of precancer skin growth, 2-14 growths (17003)391 services
2. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)375 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)352 services
4. Destruction of precancer skin growth, 1 growth (17000)147 services
5. Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or (G2212)105 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 cholesterol72%
• High blood pressure64%
• Arthritis46%
• Chronic kidney disease26%
• Ischemic heart disease25%
• Osteoporosis25%

Hospitals where William G. Tsiaras works

Medicare's Facility Affiliation Data lists William G. Tsiaras 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.

• Brigham and Women's HospitalBoston, MA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 220110

Practice locations

Addresses where William G. Tsiaras is enrolled with Medicare (CMS data updated October 2, 2026).

• 1153 Centre StJamaica Plain, MA 02130 (617) 983‑7000
• 221 Longwood AveBoston, MA 02115 (617) 732‑5500

Group practices

Medicare enrollment lists William G. Tsiaras as a member of this group (CMS data updated October 2, 2026).

• Brigham and Womens Physicians Organization Inc2,994 clinicians in the group

Specialties

• Dermatologyprimary

Find other Dermatology doctors in Massachusetts →

Other dermatologists in Jamaica Plain

Clinicians with the same Medicare primary specialty in Jamaica Plain, MA — not a recommendation.

• Alexandra P. Charrow, MD
• Chrysalyne D. Schmults, MD
• Melissa A. Levoska, MD
• Rebecca G. Gaffney, MD
• Jason E. Frangos, MD
• Sotonye Imadojemu, MD

All dermatologists in Jamaica Plain →

Other clinicians in Brigham and Womens Physicians Organization Inc

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

• Ahmed Yousef, MD
• Emily C. Goins, MD
• Andrew Newman, MD
• Elizabeth McNulty
• Jennifer L. Hanberg, MD
• Kathleen A. Lee-Sarwar, 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