Quick answers
- Does Marc Z. Simmons accept Medicare assignment?
- Yes. Medicare's clinician data says Marc Z. Simmons 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 Marc Z. Simmons see?
- In 2024, CMS data shows 1,265 Original Medicare patients and 1,926 services for Marc Z. Simmons. This counts Original Medicare only and measures volume, not quality.
- What is Marc Z. Simmons's NPI number?
- 1841208386. 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 Marc Z. Simmons, 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 | 1,265 |
|---|---|
| Services billed to Medicare | 1,926 |
| Different services or procedures | 38 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Ct scan of chest with contrast (71260)603 services
- Ct scan of abdomen and pelvis with contrast (74177)579 services
- Ct scan of chest without contrast (71250)204 services
- Ultrasound scan of head and neck soft tissue (76536)109 services
- X-ray of chest, 2 views (71046)93 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%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)62%
- Arthritis46%
- Ischemic heart disease36%
- Anxiety33%
Practice locations
Addresses where Marc Z. Simmons is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 10; the Medicare profile lists all.
- 1101 Hempstead TpkeUniondale, NY 11553 (516) 559‑1000
- 1275 York AveNew York, NY 10065 (212) 639‑2000
- 136 Mountain View BlvdBasking Ridge, NJ 07920
- 136 Mountainview BlvdBasking Ridge, NJ 07920 (908) 542‑3000
- 160 E 53rd StNew York, NY 10022 (212) 610‑0496
Group practices
Medicare enrollment lists Marc Z. Simmons as a member of these groups (CMS data updated October 2, 2026).
- MSK Monmouth295 clinicians in the group
- MSK Bergen255 clinicians in the group
- Memorial Sloan Kettering Cancer Center at Basking Ridge New Jersey229 clinicians in the group
- MSKCC Radiology Group193 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Uniondale
Clinicians with the same Medicare primary specialty in Uniondale, NY — not a recommendation.
Other clinicians in MSK Monmouth
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of Ny Upstate Medical University |
| Graduation year | 1986 (40 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1841208386 |
| 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
- 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