Quick answers
- Does Gregg D. Blumberg accept Medicare assignment?
- Yes. Medicare's clinician data says Gregg D. Blumberg 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.
- What is Gregg D. Blumberg's NPI number?
- 1659994440. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregg D. Blumberg works
Medicare's Facility Affiliation Data lists Gregg D. Blumberg 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.
- Clara Maass Medical CenterBelleville, NJ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 310009
- Jersey City Medical CenterJersey City, NJ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 310074
Practice locations
Addresses where Gregg D. Blumberg is enrolled with Medicare (CMS data updated October 2, 2026).
- 1 Hamilton Health PlHamilton, NJ 08690 (609) 586‑7900
- 1 Robert Wood Johnson Pl, Robert Wood Johnson University HospNew Brunswick, NJ 08901 (732) 828‑3000
Group practices
Medicare enrollment lists Gregg D. Blumberg as a member of this group (CMS data updated October 2, 2026).
- RWJBH Observation Associates LLC1,008 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Hamilton
Clinicians with the same Medicare primary specialty in Hamilton, NJ — not a recommendation.
Other clinicians in RWJBH Observation Associates LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | New York College Of Osteo Medicine Of New York Institute Of Technology |
| Graduation year | 2020 (6 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659994440 |
| 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
- 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