Lynn B. McGrath Jr., MD

Medicare activity in 2024

Official CMS public-use data for Lynn B. McGrath Jr., 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. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)43 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)30 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%
• Arthritis75%
• Diabetes40%
• Ischemic heart disease39%
• Heart failure24%

Hospitals where Lynn B. McGrath Jr. works

Medicare's Facility Affiliation Data lists Lynn B. McGrath Jr. 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 Maine Medical CenterPortland, ME · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 200009
• Northern Light Mercy HospitalPortland, ME · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 200008

Practice locations

Addresses where Lynn B. McGrath Jr. is enrolled with Medicare (CMS data updated October 2, 2026).

• 155 Rover River PkwyPortland, ME 04102 (207) 879‑3000
• 175 Fore River PkwyPortland, ME 04102 (207) 879‑3000
• 195 Fore River Pkwy, Suite 440Portland, ME 04102 (207) 553‑6054
• 40 Park RdWestbrook, ME 04092 (207) 857‑8174

Group practices

Medicare enrollment lists Lynn B. McGrath Jr. as a member of this group (CMS data updated October 2, 2026).

• Mercy Hospital301 clinicians in the group

Specialties

• Neurosurgeryprimary

Find other Neurosurgery doctors in Maine →

Other neurosurgeons in Portland

Clinicians with the same Medicare primary specialty in Portland, ME — not a recommendation.

• Matthew R. Sanborn, MD
• Paul N. Porensky, MD
• Nicolas F. Arredondo, MD
• Robert D. Ecker, MD
• Rajiv D. Desai, MD
• Michael S. Kleinman, DO
• Konrad N. Barth, MD
• Jeffrey E. Florman, MD

All neurosurgeons in Portland →

Other clinicians in Mercy Hospital

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

• Matthew Oliff, MD
• David Ghiorse, PA
• Kelly H. Bickmore
• Cody J. Bothel, PA
• Natasha L. Williamson, NP
• Maureen E. Furlong, CNA

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