Quick answers
- Does Seymour Rosen accept Medicare assignment?
- Yes. Medicare's clinician data says Seymour Rosen 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 Seymour Rosen see?
- In 2024, CMS data shows 45 Original Medicare patients and 644 services for Seymour Rosen. This counts Original Medicare only and measures volume, not quality.
- What is Seymour Rosen's NPI number?
- 1134234032. 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 Seymour Rosen, 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 | 45 |
|---|---|
| Services billed to Medicare | 644 |
| Different services or procedures | 10 |
| Participating Medicare provider | Yes |
| Average age of these patients | 69 |
Most frequent services
- Antibody evaluation, each additional single antibody stain procedure (88350)360 services
- Special stained specimen slides to examine tissue including interpretation and report (88313)146 services
- Pathology examination of tissue using a microscope, intermediate complexity (88305)44 services
- Antibody evaluation, initial single antibody stain procedure (88346)44 services
- Electron microscopy for diagnosis (88348)42 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%
- Chronic kidney disease75%
- Diabetes58%
- Heart failure40%
- Arthritis38%
Hospitals where Seymour Rosen works
Medicare's Facility Affiliation Data lists Seymour Rosen 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.
- Beth Israel Deaconess Medical CenterBoston, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220086
- Mount Auburn HospitalCambridge, MA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 220002
Practice locations
Addresses where Seymour Rosen is enrolled with Medicare (CMS data updated October 2, 2026).
- 330 Brookline AveBoston, MA 02215 (617) 754‑8612
Group practices
Medicare enrollment lists Seymour Rosen as a member of this group (CMS data updated October 2, 2026).
- Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc1,740 clinicians in the group
Specialties
- Pathologyprimary
Other pathologists in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Other clinicians in Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Illinois College Of Med (chi/peor/rock/chm-Urb) |
| Graduation year | 1959 (67 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134234032 |
| 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