2026 NPPES data Gastroenterology Physician NPI 1508126988
Verify on CMS →

ADAM RIORDAN

Gastroenterology Physician in ITHACA, New York. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
833
Medicare Part D claims · 346 beneficiaries · Gastroenterology Physician avg: 833
Generic prescribing
83%
generic claims · 17% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
95.2197/100
▲ 12 pts above national avg 83.1 · [object Object]
Industry payments
$1.5K
73 payments · CMS Open Payments (Sunshine Act)

What the federal data shows

ADAM RIORDAN reported a CMS MIPS final score of 95.2197/100 — above the 83.1 national average — and filed 833 Medicare Part D claims in 2023.

95.2197/100
MIPS score · +12 vs avg
833
Part D claims, 2023
83%
generic prescribing
Likely
board-certified (heuristic)

Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) — no proprietary rating or editorial opinion is applied.

ADAM RIORDAN's MIPS score vs every scored U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023 — the federal quality measure

95 Top 21% higher than 79% of 477,587 scored providers

0–10: 8,684 scored providers (2%). Below this entry. 10–20: 3,008 scored providers (1%). Below this entry. 20–30: 3,069 scored providers (1%). Below this entry. 30–40: 2,746 scored providers (1%). Below this entry. 40–50: 2,928 scored providers (1%). Below this entry. 50–60: 5,882 scored providers (1%). Below this entry. 60–70: 13,906 scored providers (3%). Below this entry. 70–80: 118,074 scored providers (25%). Below this entry. 80–90: 129,887 scored providers (27%). Below this entry. 90–100: 189,403 scored providers (40%). This entry sits in this band. This provider 0 100 every MIPS-scored clinician, bucketed by value

Each bar is a band; taller bars hold more scored providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source CMS Merit-based Incentive Payment System (MIPS) · 2023

Board certification likely (heuristic — not verified)

ADAM RIORDAN practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 2 hospital affiliations — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about ADAM RIORDAN?

High performer (top quartile)

NPI registry status

Active

Issued 05/20/2012

NPI 1508126988

Primary specialty

Gastroenterology Physician

Mid-sized

16,567 US NPIs in this specialty

Medicare Part D claims

833 0% vs specialty avg

2023 prescription claims

Specialty avg: 833

MIPS final score

95.2197/100 12.119700000000009% pts

Exceptional band

vs 83.1 national avg

Specialty distribution in New York

How Gastroenterology Physician compares to other specialties among New York providers

New York providers

Gastroenterology Physician share within New York

1. Gastroenterology Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Gastroenterology Physician share within New York

Medicare quality performance — MIPS

ADAM RIORDAN's 2023 MIPS final score plotted against the Gastroenterology Physician national average

High performer (top quartile)
MIPS Final Score
95.2197/100
vs 83.1 national avg · 2023 performance year

MIPS final score (Gastroenterology Physician) — 95.2197/100 vs national avg 83.1

0%100%National avg83%95.2%
MIPS final score (Gastroenterology Physician) — 95.2197/100 vs national avg 83.1

The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.

Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).

ADAM RIORDAN appears in the CMS NPPES registry as a Gastroenterology Physician provider at 2435 N TRIPHAMMER RD, ITHACA, NY, 14850, with a listed phone of (607) 272-5011. NPI 1508126988 was issued on 05/20/2012. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what RIORDAN most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 833 prescription claims written by this provider, covering 346 Medicare beneficiaries and totaling roughly $377K in drug spend, split 17% brand-name and 83% generic by claim count. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 95.2197/100 for the 2023 performance year (Quality 84.6968), compared with the national average of 83.1.

Gastroenterology Physician is a mid-sized specialty nationwide, with 16,567 enrolled providers across 54 states and an average of 833 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist — always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

2435 N TRIPHAMMER RD
ITHACA, NY 14850

Provider Details

NPI 1508126988
Specialty Gastroenterology Physician
Gender Male
NPI Issued 05/20/2012

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

95.2197
Final Score
Avg: 83.1
84.6968
Quality
100
Promoting Interoperability

Reporting: Alternative Payment Model

Hospital and facility affiliations

Facilities where ADAM RIORDAN bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" — a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.

GASTROENTEROLOGY ASSOCIATES OF ITHACA PC
ITHACA, NY
GUTHRIE MEDICAL GROUP PC
ITHACA, NY

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

Industry payments received (2024) — CMS Open Payments transparency data

The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for ADAM RIORDAN. Source: openpaymentsdata.cms.gov.

Total received

$1.5K

Largest payer

QOL Medical, LLC

Most common payment type

Food and Beverage

Industry payments are not necessarily indicators of bias — they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.

License & disciplinary context — New York NYSBPMC 2023 annual report

Aggregate state board data only — NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~100K New York medical licensees in 2023 — they are NOT specific to ADAM RIORDAN. To verify ADAM RIORDAN's current license status, search the NYSBPMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

312
Total board actions, New York 2023
Across 302 cases
3.12
Actions per 1,000 licensees
New York statewide rate
probation
Most common action type
89 cases

NYSBPMC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the New York disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Brand vs generic prescribing mix · Typical

ADAM RIORDAN — brand share 17.0%
Specialty average (est.)

17% brand-name claims vs 83% generic, on 833 2023 Medicare Part D claims.

The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

833
Total Claims
$377K
Total Drug Cost
346
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
1,681
Total Day Supply
44,412
Brand vs Generic
17% brand / 83% generic
Brand Drug Cost
$330K
Generic Drug Cost
$47K
Antibiotic Claims
20

Patient Demographics

Average Patient Age
70.6 years
Avg HCC Risk Score
0.92
Gender Split
49% female / 51% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What ADAM RIORDAN prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Pantoprazole Sodium
274
Omeprazole
120
Esomeprazole Magnesium
27
Creon
Lipase/Protease/Amylase
26
Lansoprazole
18
Famotidine
17
Ondansetron Odt
Ondansetron
13
Gavilyte-C
"Peg3350/Sod Sulf
N/A
Gavilyte-G
"Peg3350/Sod Sulf
N/A
Sod Sulf-Potass Sulf-Mag Sulf
"Sodium
N/A

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Gastroenterology Physician Overview

How ADAM RIORDAN fits within the Gastroenterology Physician landscape nationally.

16,567
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider

ADAM RIORDAN's 833 claims are below the specialty average of 833.

Nearby Gastroenterology Physician Providers in New York

Other clinicians with the same primary specialty enrolled in New York, drawn from the same CMS NPPES roster as RIORDAN.

Compare Gastroenterology Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is ADAM RIORDAN's specialty?
ADAM RIORDAN specializes in Gastroenterology Physician and practices in ITHACA, New York.
How much does ADAM RIORDAN prescribe under Medicare Part D?
In 2023, ADAM RIORDAN wrote 833 Medicare Part D claims totaling $377K in drug costs for 346 beneficiaries.
What is ADAM RIORDAN's Medicare quality score?
ADAM RIORDAN has a CMS MIPS Final Score of 95.2197/100 (Quality: 84.6968). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is ADAM RIORDAN located?
ADAM RIORDAN is located at 2435 N TRIPHAMMER RD, ITHACA, NY, 14850. Phone: (607) 272-5011.
What is ADAM RIORDAN's NPI number?
ADAM RIORDAN's National Provider Identifier (NPI) is 1508126988, issued on 05/20/2012.
Does ADAM RIORDAN prescribe more brand-name or generic drugs?
ADAM RIORDAN's prescribing is 17% brand-name and 83% generic drugs by claim count, with $330K in brand drug costs.
How many Gastroenterology Physician providers are there in the US?
There are 16,567 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 833 Medicare Part D claims per year.
What drugs does ADAM RIORDAN prescribe most often?
Based on 2023 Medicare Part D data, ADAM RIORDAN's most frequently prescribed drugs include Pantoprazole Sodium, Omeprazole, Esomeprazole Magnesium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does ADAM RIORDAN accept Medicare?
ADAM RIORDAN appears in CMS Medicare data with 833 Part D claims and 346 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify ADAM RIORDAN's credentials?
ADAM RIORDAN's NPI is 1508126988. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.

Data Sources

Provider Directory
CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
Specialty Classification
NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
Prescribing Data
CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
Quality Performance
CMS Merit-based Incentive Payment System (MIPS) — 2023 performance year.
Limitations
Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.

See our complete data methodology for details on how we collect and process government data.

Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).

Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology