ADAM ROBERT RIORDAN
NPI 1508126988
Internal Medicine - Gastroenterology in Ithaca, NY
About Adam Robert Riordan NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ADAM ROBERT RIORDAN (NPI 1508126988) is an individual gastroenterology provider in Ithaca, New York, licensed in New York (293512) and active in the NPI registry since May 2012. He is enrolled in Medicare PECOS, is affiliated with Guthrie Cortland Regional Medical Center, and is a graduate of State University Of New York At Buffalo School Of Medicine (2015).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Adam Robert Riordan is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Adam Riordan reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Ithaca, NY 14850
- Reassigned Medicare billing, New York enrollment
- 5 clinicians in this Medicare group
Sayre, PA 18840
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Guthrie Medical Group PC
- 798 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 11
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Guthrie Cortland Regional Medical Center
Acute Care Hospitals · Cortland, NYCayuga Medical Center At Ithaca
Acute Care Hospitals · Ithaca, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 14850 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 6
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ITHACA, NY 14850
ITHACA, NY 14850
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Adam Riordan's NPI number?
The NPI number for Adam Riordan is 1508126988. It was assigned to this individual provider in the NPPES registry on May 20, 2012.
Where is Adam Riordan located?
Adam Riordan practices at 2435 N Triphammer Rd, Ithaca, NY 14850. The listed phone number is (607) 272-5011.
What is Adam Riordan's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Adam Riordan enrolled in Medicare?
Yes. Adam Riordan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Adam Riordan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Adam Riordan reassigns Medicare benefits to 2 organizations: Gastroenterology Associates Of Ithaca, PC (Ithaca, NY) and Guthrie Medical Group, P.C. (Sayre, PA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Adam Riordan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Adam Riordan accept?
Health plans from Ambetter Health, Ambetter Health of Delaware and Ambetter from Buckeye Health Plan list Adam Riordan as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Adam Riordan affiliated with any hospitals?
According to CMS data, Adam Riordan is affiliated with Guthrie Cortland Regional Medical Center and Cayuga Medical Center At Ithaca.
When was this NPI record last updated?
The NPPES record for Adam Riordan was last updated on July 11, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Adam Robert Riordan · NPI 1508126988
Gastroenterology physician in Ithaca, New York. Individual provider, active in the CMS NPPES registry since May 20, 2012.
## Identity
- **NPI:** 1508126988 (Entity type: Individual)
- **Enumerated:** May 20, 2012
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** 293512 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 2435 N TRIPHAMMER RD, Ithaca, NY 14850
- **Phone:** (607) 272-5011
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Gastroenterology Associates Of Ithaca, PC (NPI 1538113709, Ithaca, NY); Guthrie Medical Group, P.C. (NPI 1245246644, Sayre, PA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** State University Of New York At Buffalo School Of Medicine, class of 2015
## Record status
- **NPPES last updated:** July 11, 2018
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Source: [NPI Profile](https://npiprofile.com/npi/1508126988) · Data from the CMS NPPES public registry.