Louis J. Berk, MD

Medicare activity in 2024

Official CMS public-use data for Louis J. Berk, 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 office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)306 services
2. Insertion of needle into vein for collection of blood sample (36415)265 services
3. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)220 services
4. Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)176 services
5. Blood test, comprehensive group of blood chemicals (80053)165 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 cholesterol61%
• High blood pressure56%
• Arthritis32%
• Anxiety20%
• Diabetes19%
• Ischemic heart disease17%

Hospitals where Louis J. Berk works

Medicare's Facility Affiliation Data lists Louis J. Berk 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.

• Emerson Hospital -W Concord, MA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 220084
• Lahey Hospital & Medical Center, BurlingtonBurlington, MA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 220171
• Massachusetts Eye and Ear Infirmary -Boston, MA · Acute Care Hospital · Emergency services: listed by Medicare · CCN 220075

Practice locations

Addresses where Louis J. Berk is enrolled with Medicare (CMS data updated October 2, 2026).

• 321 Main StActon, MA 01720 (978) 635‑8700

Group practices

Medicare enrollment lists Louis J. Berk as a member of this group (CMS data updated October 2, 2026).

• Acton Medical Associates PC34 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in Massachusetts →

Other internal medicine doctors in Acton

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

• Natalie L. Cohen, MD
• Teli Leung-Galecki, MD
• Lauren M. Bleich
• Meenakshi Garg, MD
• Amy R. Lo, MD
• Christine H. Brown, MD
• Narine Sharkhatunyan, MD
• Allessandro A. Girolamo, MD

All internal medicine doctors in Acton →

Other clinicians in Acton Medical Associates PC

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

• Michelle Travassos
• Natalie L. Cohen, MD
• Jasmin S. Darling, MD
• Narine Sharkhatunyan, MD
• Alexandra L. Iannini, MD
• Barbara J. Casaceli, MNT

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