Dr. Liam Gerard O'Riordan, DO
- Medicare services, 2024
- 746
- Medicare patients, 2024
- 674
- Part D claims, 2024
- 289
- MIPS score, 2024
- 22
- Hospital affiliations
- 2
- Practice address
- 160 North Midland Avenue, Nyack, NY 10960
- Practice phone
- Call (845) 348-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. O'Riordan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Liam Gerard O'Riordan is an emergency medicine physician in Nyack, New York
Dr. O'Riordan practices at Montefiore Nyack Hospital in Nyack, New York, part of Montefiore Einstein.
Dr. O'Riordan's NPI, 1235626979, was assigned on April 18, 2018. Dr. O'Riordan graduated from Touro Un Col of Osteopathic Medicine, New York in 2018. Dr. O'Riordan holds New York license 311919.
- NPI
- 1235626979NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4688078694
- NPI enumeration date
- April 18, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (845) 348-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Liam Gerard O'Riordan practices at Montefiore Nyack Hospital in Nyack, New York
Dr. O'Riordan's primary practice is Montefiore Nyack Hospital, at 160 North Midland Avenue, Nyack, NY 10960 in Rockland County. The practice phone is (845) 348-2000.
- Montefiore Nyack Hospital160 North Midland Avenue, Nyack, NY 10960 · Rockland CountyPhone(845) 348-2000
Source: Dmand AI Affiliation Data
Dr. Liam Gerard O'Riordan is affiliated with 2 sites of care and 2 medical groups
Dr. O'Riordan's primary practice is Montefiore Nyack Hospital in Nyack, New York, part of Montefiore Einstein. Dr. O'Riordan is also affiliated with St. Joseph's Health Hospital. The medical group on file is Emergency Medical Association of New York. Dmand AI also links Dr. O'Riordan to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Liam Gerard O'Riordan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Riordan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Montefiore Nyack Hospital | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across Montefiore Einstein and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Liam Gerard O'Riordan is one of 3,709 emergency medicine physicians in New York
Emergency medicine is Dr. O'Riordan's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. O'Riordan is licensed in New York.
Specialties and state licenses
- Emergency medicine, New YorkPrimary
Emergency medicine physicians near Dr. O'Riordan
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Liam Gerard O'Riordan billed Medicare for 746 services in 2024
CMS data shows 746 Medicare services from Dr. O'Riordan across 5 procedure codes in 2024, for 674 Medicare patients. Medicare paid $108,433 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. O'Riordan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5782024: 74629%
Dr. O'Riordan compared with the New York median for emergency medicine physicians, 2024
- Dr. O'Riordan
- New York median
- Medicare services
- 746vs 2193.4 times
- Medicare patients
- 674vs 2163.1 times
- Part D claims
- 158vs 295.4 times
Medians across 3,510 emergency medicine physicians in New York with Dmand AI profiles that report each measure.
Dr. O'Riordan's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Liam Gerard O'Riordan treated 674 Medicare patients in 2024, average age 77
CMS counts 674 Medicare patients who saw Dr. O'Riordan in 2024. The largest group is 75 to 84, with 208 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 32% are also on Medicaid. Their average risk score is 2.18, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. O'Riordan's median patient age at 56, with 57% women.
Dr. O'Riordan's Medicare patients by age, 2024
Dr. O'Riordan's Medicare patients by sex, 2024
- Women36554%
- Men30946%
Chronic conditions among Dr. O'Riordan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis58%
- Diabetes44%
- Mood disorders44%
- Ischemic heart disease43%
- Anxiety38%
- Chronic kidney disease36%
Share of Medicare patients with each condition. A patient can have several.
Dr. O'Riordan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 56
Patient panel by sex, all payers
- Women57%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Liam Gerard O'Riordan wrote 289 Medicare Part D claims in 2024
In 2024, Dr. O'Riordan wrote 289 Medicare Part D claims for 182 patients. 93% of them were for generic drugs. CMS names the drug for 158 of them, across 7 drugs with 11 or more claims each, at $931 in total drug cost. In 2023, CMS named 196 claims across 10 drugs.
Dr. O'Riordan's Part D claims by kind of drug, 2024
- Generic270 claims93%
- Brand-name19 claims7%
Dr. O'Riordan's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. O'Riordan's Part D claims, 2024
- Opioids9%27 of 289 claims
- Antibiotics29%85 of 289 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1962024: 15819%
Drugs named by CMS: 7 in 2024, 10 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Liam Gerard O'Riordan scored 22 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 22 out of 100 for Dr. O'Riordan for performance year 2024, reported individually. Dr. O'Riordan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. O'Riordan's MIPS scores, performance year 2024
- 22of 100Final score
- 0of 100Quality
- 0of 100Improvement Activities
- 75of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Liam Gerard O'Riordan received $140 in industry payments in 2023
CMS Open Payments shows 1 general payment to Dr. O'Riordan from 1 drug or device company in 2023. Food and beverage make up the largest share, 100% of the total. Inari Medical, Inc. paid the most, $140.
Companies that paid Dr. O'Riordan the most, 2023 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Liam Gerard O'Riordan graduated from Touro Un Col of Osteopathic Medicine, New York
Dr. O'Riordan graduated from Touro Un Col of Osteopathic Medicine, New York in 2018.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Liam Gerard O'Riordan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Liam Gerard O'Riordan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Liam Gerard O'Riordan's NPI number?
Dr. Liam Gerard O'Riordan's NPI number is 1235626979. It was assigned on April 18, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Liam Gerard O'Riordan?
Dr. Liam Gerard O'Riordan is an emergency medicine physician in Nyack, New York. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Liam Gerard O'Riordan practice?
Dr. O'Riordan practices at 160 North Midland Avenue, Nyack, NY 10960. Dr. O'Riordan's primary practice is Montefiore Nyack Hospital in Nyack, New York, part of Montefiore Einstein. Dmand AI also links Dr. O'Riordan to 1 medical group.
What is Dr. Liam Gerard O'Riordan's office phone number?
The practice phone on file for Dr. O'Riordan is (845) 348-2000.
What is Dr. Liam Gerard O'Riordan's medical license number?
Dr. O'Riordan holds New York license 311919.
Which hospitals is Dr. Liam Gerard O'Riordan affiliated with?
Dr. O'Riordan practices at Montefiore Nyack Hospital in Nyack, New York. Dr. O'Riordan is also affiliated with St. Joseph's Health Hospital.
What medical group is Dr. Liam Gerard O'Riordan part of?
Dr. O'Riordan is linked to Emergency Medical Association of New York. Dmand AI links Dr. O'Riordan to 1 more medical group.
Does Dr. Liam Gerard O'Riordan accept Medicare?
Yes. CMS data shows Dr. O'Riordan billed Medicare for 746 services in 2024, and Dr. O'Riordan accepts Medicare assignment.
What is Dr. Liam Gerard O'Riordan's MIPS score?
Dr. O'Riordan's MIPS final score for performance year 2024 is 22 out of 100, reported individually.
How many Medicare patients does Dr. Liam Gerard O'Riordan see?
CMS counts 674 Medicare patients who saw Dr. O'Riordan in 2024, with an average age of 77.
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What services does Dr. Liam Gerard O'Riordan bill to Medicare?
In 2024, Dr. O'Riordan's most billed Medicare services were emergency department visit (99285), emergency department visit (99284) and critical care (99291).
Where did Dr. Liam Gerard O'Riordan go to medical school?
Dr. O'Riordan graduated from Touro Un Col of Osteopathic Medicine, New York in 2018.
What drugs does Dr. Liam Gerard O'Riordan prescribe most?
In 2024 Medicare Part D data, Dr. O'Riordan's most prescribed drugs by claims were Cefdinir, Prednisone and Oxycodone-Acetaminophen.
Has Dr. Liam Gerard O'Riordan received payments from drug or device companies?
CMS Open Payments shows $140 in general payments to Dr. O'Riordan from 1 company from 2023 to 2023. The largest total came from Inari Medical, Inc.
How long has Dr. Liam Gerard O'Riordan been practicing?
Dr. O'Riordan graduated from medical school in 2018, 8 years ago.
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