Quick answers
- Does Zachary O. Masi accept Medicare assignment?
- Yes. Medicare's clinician data says Zachary O. Masi 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 Zachary O. Masi see?
- In 2024, CMS data shows 267 Original Medicare patients and 663 services for Zachary O. Masi. This counts Original Medicare only and measures volume, not quality.
- What is Zachary O. Masi's NPI number?
- 1396092979. 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 Zachary O. Masi, 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 | 267 |
|---|---|
| Services billed to Medicare | 663 |
| Different services or procedures | 112 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Drainage of fluid from abdominal cavity using imaging guidance (49083)95 services
- Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)47 services
- Aspiration of fluid from chest cavity using imaging guidance (32555)33 services
- Fine needle aspiration biopsy using ultrasound guidance, first growth (10005)30 services
- Review by radiologist of ct guidance for needle placement (77012)29 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%
- Arthritis44%
- Diabetes41%
- Ischemic heart disease39%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)37%
Hospitals where Zachary O. Masi works
Medicare's Facility Affiliation Data lists Zachary O. Masi 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.
- Corning HospitalCorning, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330277
- Guthrie Cortland Regional Medical CenterCortland, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330175
- Robert Packer HospitalSayre, PA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 390079
Practice locations
Addresses where Zachary O. Masi is enrolled with Medicare (CMS data updated October 2, 2026).
- 1 Guthrie DrCorning, NY 14830 (607) 973‑7200
- 1 Guthrie SqSayre, PA 18840 (570) 887‑3241
Group practices
Medicare enrollment lists Zachary O. Masi as a member of this group (CMS data updated October 2, 2026).
- Guthrie Medical Group PC795 clinicians in the group
Specialties
- Interventional Radiologyprimary
- Diagnostic Radiologyalso
Other interventional radiologists in Corning
Clinicians with the same Medicare primary specialty in Corning, 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 | 2012 (14 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1396092979 |
| 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