John J. Oppenheimer, MD

Medicare activity in 2024

Official CMS public-use data for John J. Oppenheimer, 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. Injection, omalizumab, 5 mg (J2357)2,490 services
2. Injection, benralizumab, 1 mg (J0517)1,500 services
3. Test for allergy using allergenic extract (95004)1,093 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)215 services
5. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)144 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 cholesterol75%
• High blood pressure65%
• Arthritis48%
• Asthma46%
• Ischemic heart disease31%
• Osteoporosis29%

Hospitals where John J. Oppenheimer works

Medicare's Facility Affiliation Data lists John J. Oppenheimer 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.

• Morristown Medical CenterMorristown, NJ · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 310015

Practice locations

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

• 261 James St, Suite 3fMorristown, NJ 07960 (973) 267‑3646
• 3461 US Hwy 22Branchburg, NJ 08876 (908) 725‑4777

Group practices

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

• Jeffrey Weiss, M.D., P.A.18 clinicians in the group

Specialties

• Allergy/Immunologyprimary

Find other Allergy/Immunology doctors in New Jersey →

Other allergist and immunologists in New Jersey

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

• Donatella B. Graffino, MD
• Kerry S. Lebenger, MD
• Dara I. Cohn, MD
• Andrew Hirsch, MD
• Vima Patel, MD
• Chirag Patel, MD
• Peter J. Benincasa, MD
• Martin S. Pine, MD

All allergist and immunologists in New Jersey →

Other clinicians in Jeffrey Weiss, M.D., P.A.

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

• Salwa E. Elias, MD
• Alexander Marotta, MD
• Jessica W. Blume, MD
• Raquel B. Empedrad, MD
• Katie L. Bogusz, MD
• James A. Fox, 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