Quick answers
- Does Adam R. Riordan accept Medicare assignment?
- Yes. Medicare's clinician data says Adam R. Riordan 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 Adam R. Riordan see?
- In 2024, CMS data shows 344 Original Medicare patients and 730 services for Adam R. Riordan. This counts Original Medicare only and measures volume, not quality.
- What is Adam R. Riordan's NPI number?
- 1508126988. 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 Adam R. Riordan, 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 | 344 |
|---|---|
| Services billed to Medicare | 730 |
| Different services or procedures | 32 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)204 services
- Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)127 services
- Biopsy of large bowel using a flexible endoscope (45380)111 services
- Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)81 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)41 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 cholesterol70%
- High blood pressure65%
- Arthritis39%
- Diabetes27%
- Ischemic heart disease24%
- Anxiety22%
Hospitals where Adam R. Riordan works
Medicare's Facility Affiliation Data lists Adam R. Riordan 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.
- Cayuga Medical Center at IthacaIthaca, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330307
- Guthrie Cortland Regional Medical CenterCortland, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330175
Practice locations
Addresses where Adam R. Riordan is enrolled with Medicare (CMS data updated October 2, 2026).
- 720 Willow AveIthaca, NY 14850 (607) 219‑4600
Group practices
Medicare enrollment lists Adam R. Riordan as a member of this group (CMS data updated October 2, 2026).
- Guthrie Medical Group PC795 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Ithaca
Clinicians with the same Medicare primary specialty in Ithaca, 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 | DO |
|---|---|
| Medical school | State University Of New York At Buffalo School Of Medicine |
| Graduation year | 2015 (11 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1508126988 |
| 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