DR. LIAM GERARD O'RIORDAN DO
NPI 1235626979
Emergency Medicine in Syracuse, NY
About Dr. Liam Gerard O'riordan Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LIAM GERARD O'RIORDAN DO (NPI 1235626979) is an individual emergency medicine provider in Syracuse, New York, licensed in New York (311919) and active in the NPI registry since April 2018. He is enrolled in Medicare PECOS, is affiliated with Nyack Hospital, and is a graduate of Touro Un Col Of Osteopathic Medicine, New York (2018).
NPPES Registry Identity
Specialties & Licenses
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
Dr. Liam Gerard O'riordan Do 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
3Medicare enrollment records show Liam O'riordan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Syracuse, NY 13203
- Reassigned Medicare billing, New York enrollment
- 235 clinicians in this Medicare group
Poughkeepsie, NY 12601
- Reassigned Medicare billing, New York enrollment
- 201 clinicians in this Medicare group
Nyack, NY 10960
- Reassigned Medicare billing, New York enrollment
- 85 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 5
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.
Nyack Hospital
Acute Care Hospitals · Nyack, NYPutnam Hospital Center
Acute Care Hospitals · Carmel, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 13203 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SYRACUSE, NY 13203
SYRACUSE, NY 13203
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 Liam O'riordan's NPI number?
The NPI number for Liam O'riordan is 1235626979. It was assigned to this individual provider in the NPPES registry on April 18, 2018.
Where is Liam O'riordan located?
Liam O'riordan practices at 301 Prospect Ave, Syracuse, NY 13203. The listed phone number is (315) 448-5111.
What is Liam O'riordan's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Liam O'riordan enrolled in Medicare?
Yes. Liam O'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 Liam O'riordan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Liam O'riordan reassigns Medicare benefits to 3 organizations: Physicians Medical Associates New York PC (Syracuse, NY), Emergency Physician Services Of New York, P.C. (Poughkeepsie, NY) and Nyack Emergency Medical Association PLLC (Nyack, NY). 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 Liam O'riordan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Liam O'riordan affiliated with any hospitals?
According to CMS data, Liam O'riordan is affiliated with Nyack Hospital and Putnam Hospital Center.
When was this NPI record last updated?
The NPPES record for Liam O'riordan was last updated on March 7, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Dr. Liam Gerard O'riordan, DO · NPI 1235626979
Emergency Medicine physician in Syracuse, New York. Individual provider, active in the CMS NPPES registry since April 18, 2018.
## Identity
- **NPI:** 1235626979 (Entity type: Individual)
- **Enumerated:** April 18, 2018
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 311919 (New York)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 301 PROSPECT AVE, Syracuse, NY 13203-1807
- **Phone:** (315) 448-5111
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Physicians Medical Associates New York PC (NPI 1073386421, Syracuse, NY); Emergency Physician Services Of New York, P.C. (NPI 1093759847, Poughkeepsie, NY); Nyack Emergency Medical Association PLLC (NPI 1174627293, Nyack, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Touro Un Col Of Osteopathic Medicine, New York, class of 2018
## Record status
- **NPPES last updated:** March 7, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1235626979) · Data from the CMS NPPES public registry.