Quick answers
- Does Seung Shin Hahn accept Medicare assignment?
- Yes. Medicare's clinician data says Seung Shin Hahn 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 Seung Shin Hahn see?
- In 2024, CMS data shows 239 Original Medicare patients and 654 services for Seung Shin Hahn. This counts Original Medicare only and measures volume, not quality.
- What is Seung Shin Hahn's NPI number?
- 1043233711. 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 Seung Shin Hahn, 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 | 239 |
|---|---|
| Services billed to Medicare | 654 |
| Different services or procedures | 33 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Ct guidance for insertion of radiation therapy fields (77014)244 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)103 services
- Design and construction of complex radiation treatment device (77334)23 services
- Radiation treatment management, 5 treatment sessions (77427)20 services
- Diagnostic exam of voice box using a flexible endoscope (31575)19 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 cholesterol75%
- High blood pressure74%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)53%
- Arthritis36%
- Ischemic heart disease28%
- COPD27%
Hospitals where Seung Shin Hahn works
Medicare's Facility Affiliation Data lists Seung Shin Hahn 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.
- Auburn Community HospitalAuburn, NY · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 330235
- Guthrie Cortland Regional Medical CenterCortland, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330175
- University Hospital S U N y Health Science CenterSyracuse, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330241
Practice locations
Addresses where Seung Shin Hahn is enrolled with Medicare (CMS data updated October 2, 2026).
- 105 County Route 45a, Suite 200Oswego, NY 13126 (315) 207‑9066
- 1088 Commons AveCortland, NY 13045 (607) 758‑2360
- 17 Lansing StAuburn, NY 13021 (315) 255‑7142
- 5584 E Main StVerona, NY 13478 (315) 473‑3300
- 750 E Adams StSyracuse, NY 13210 (315) 464‑5276
Group practices
Medicare enrollment lists Seung Shin Hahn as a member of these groups (CMS data updated October 2, 2026).
- Guthrie Medical Group PC795 clinicians in the group
- Auburn Community Hospital60 clinicians in the group
- Upstate University Radiation Oncology Inc16 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Oswego
Clinicians with the same Medicare primary specialty in Oswego, NY — not a recommendation.
Other clinicians in Guthrie Medical Group PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1976 (50 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1043233711 |
| 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