Quick answers
- Does Stephen J. Gunn accept Medicare assignment?
- Yes. Medicare's clinician data says Stephen J. Gunn 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 Stephen J. Gunn see?
- In 2024, CMS data shows 357 Original Medicare patients and 447 services for Stephen J. Gunn. This counts Original Medicare only and measures volume, not quality.
- What is Stephen J. Gunn's NPI number?
- 1851378996. 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 Stephen J. Gunn, 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 | 357 |
|---|---|
| Services billed to Medicare | 447 |
| Different services or procedures | 36 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Emergency department visit with moderate level of medical decision making (99284)145 services
- Emergency department visit with high level of medical decision making (99285)104 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)41 services
- Emergency department visit with low level of medical decision making (99283)21 services
- Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen (87635)18 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%
- Arthritis52%
- Ischemic heart disease40%
- Diabetes38%
- Anxiety32%
Hospitals where Stephen J. Gunn works
Medicare's Facility Affiliation Data lists Stephen J. Gunn 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.
- Ellis HospitalSchenectady, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330153
- Mount Sinai South NassauOceanside, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330198
Practice locations
Addresses where Stephen J. Gunn is enrolled with Medicare (CMS data updated October 2, 2026).
- 103 Sitterly RdHalfmoon, NY 12065 (518) 579‑2800
- 1101 Nott StSchenecctady, NY 12308 (518) 243‑4121
- 434 Union BlvdWest Islip, NY 11795 (516) 537‑9063
- 801 Broadway, Suite 100Amityville, NY 11701 (516) 784‑4486
Group practices
Medicare enrollment lists Stephen J. Gunn as a member of these groups (CMS data updated October 2, 2026).
- North Shore Lij Urgent Care PC390 clinicians in the group
- Island Emergency Medical Services PC137 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Halfmoon
Clinicians with the same Medicare primary specialty in Halfmoon, NY — not a recommendation.
Other clinicians in North Shore Lij Urgent Care PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Philadelphia College Of Osteopathic Medicine |
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1851378996 |
| 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