Joan S. Sisto, MD

Medicare activity in 2024

Official CMS public-use data for Joan S. Sisto, 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)4,632 services
2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)1,632 services
3. Destruction of precancer skin growth, 1 growth (17000)1,516 services
4. Biopsy of related skin growth, first growth (11102)1,022 services
5. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)448 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 pressure58%
• Arthritis40%
• Anxiety21%
• Osteoporosis18%
• Ischemic heart disease15%

Hospitals where Joan S. Sisto works

Medicare's Facility Affiliation Data lists Joan S. Sisto 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.

• Portsmouth Regional HospitalPortsmouth, NH · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 300029
• York HospitalYork, ME · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 200020

Practice locations

Addresses where Joan S. Sisto is enrolled with Medicare (CMS data updated October 2, 2026).

• 1 Hampton Rd, Suite A306Exeter, NH 03833 (603) 294‑4635
• 215 Commerce Way, Suite 100Portsmouth, NH 03801 (603) 441‑1075
• 23 Portsmouth AveStratham, NH 03885 (603) 942‑2171
• 71 US Route 1, Suite JScarborough, ME 04074 (207) 464‑2712

Group practices

Medicare enrollment lists Joan S. Sisto as a member of this group (CMS data updated October 2, 2026).

• Optima Dermatology LLC75 clinicians in the group

Specialties

• Dermatologyprimary

Find other Dermatology doctors in New Hampshire →

Other dermatologists in Exeter

Clinicians with the same Medicare primary specialty in Exeter, NH — not a recommendation.

• Megan L. Bernstein, MD
• Abel Jarell, MD
• Andrew Kim, MD
• Christopher J. Mancuso, DO
• Molly B. Chartier, MD
• Brienne D. Cressey, MD
• Andrew E. Werchniak, MD
• Dylan J. Badin, MD

All dermatologists in Exeter →

Other clinicians in Optima Dermatology LLC

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

• Scott T. Guenthner, MD
• Andrew J. Scripture, MD
• Audrey Hewitt
• Gretchen L. Shull, PA
• Shelby M. Geist
• Abel Jarell, 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