Gregory G. Gensheimer, MD

Medicare activity in 2024

Official CMS public-use data for Gregory G. Gensheimer, 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. Established patient complete exam of visual system (92014)135 services
2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)127 services
3. Imaging of optic nerve (92133)124 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)52 services
5. Imaging of retina (92134)46 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 pressure71%
• High cholesterol64%
• Arthritis41%
• Diabetes27%
• Atrial fibrillation25%
• Ischemic heart disease24%

Hospitals where Gregory G. Gensheimer works

Medicare's Facility Affiliation Data lists Gregory G. Gensheimer 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.

• MaineHealth Mid Coast HospitalBrunswick, ME · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 200021

Practice locations

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

• 130 Centre StBath, ME 04530 (207) 443‑6626
• 22 Bramhall StPortland, ME 04102
• 22 Station AveBrunswick, ME 04011

Group practices

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

• MaineHealth2,633 clinicians in the group

Specialties

• Ophthalmologyprimary

Find other Ophthalmology doctors in Maine →

Other ophthalmologists in Maine

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

• Mark Marotto, MD
• Linda A. Schumacher Feero, MD
• Erin E. Flynn, MD
• Sirus Hamzavi, MD
• Tracey E. Durkovich, DO
• Kimberly K. Anderson, MD
• Hallie R. Hahn, MD
• Sara Bozorg, MD

All ophthalmologists in Maine →

Other clinicians in MaineHealth

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

• Jennifer P. Moody, MD
• Kimberly J. Toomire, DO
• Richard Fernandes Almeida, MD
• Richard D. Hartnett, MD
• Shauna L. Littlefield
• Alexander R. Fiorentino, 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