Quick answers
- Does James M. Maginnis accept Medicare assignment?
- Yes. Medicare's clinician data says James M. Maginnis accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does James M. Maginnis see?
- In 2024, CMS data shows 109 Original Medicare patients and 131 services for James M. Maginnis. This counts Original Medicare only and measures volume, not quality.
- What is James M. Maginnis's NPI number?
- 1023447968. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for James M. Maginnis, 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.
| Original Medicare patients | 109 |
|---|---|
| Services billed to Medicare | 131 |
| Different services or procedures | 52 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Replacement of knee joint, both sides of knee (27447)35 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%
- Arthritis69%
- Diabetes47%
- Ischemic heart disease34%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)23%
Hospitals where James M. Maginnis works
Medicare's Facility Affiliation Data lists James M. Maginnis 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.
- Robert Wood Johnson University Hospital - SomersetSomerville, NJ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 310048
Practice locations
Addresses where James M. Maginnis is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 7; the Medicare profile lists all.
- 1 Diamond Hill RdBerkeley Heights, NJ 07922 (908) 273‑4300
- 1 Diamond Hill Rd, Summit Medical GroupBerkeley Heights, NJ 07922
- 110 Rehill AveSomerville, NJ 08876 (908) 685‑2200
- 110 Rehill Ave, Bldg FamilySomerville, NJ 08876 (908) 685‑2900
- 128 Rehill AveSomerville, NJ 08876 (855) 776‑8334
Group practices
Medicare enrollment lists James M. Maginnis as a member of these groups (CMS data updated October 2, 2026).
- Summit Medical Group PA1,212 clinicians in the group
- Barnabas Health Medical Group PC1,070 clinicians in the group
- RWJBH Observation Associates LLC1,008 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Berkeley Heights
Clinicians with the same Medicare primary specialty in Berkeley Heights, NJ — not a recommendation.
Other clinicians in Summit Medical Group PA
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2013 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1023447968 |
| Corrections | Report an error or suggest an update → |
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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians