NPI registry status
Active
2026 NPPES data Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician NPI 1972509560 MD
Verify on CMS → Christopher Riordan, MD
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Toledo, Ohio.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 5,070 in Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
92
Medicare Part D claims · 55 beneficiaries · Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician avg: 128
Industry payments
$99.96
3 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Christopher Riordan, MD filed 92 Medicare Part D claims in 2023 as a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Toledo, Ohio.
- 92
- Part D claims, 2023
- Likely
- board-certified (heuristic)
- ≥0th
- pct by Part D claim volume (lower-bound band)
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.
CMS NPPES provider registry desk
NPI 1972509560 · Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-TRACE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1972509560
- ENUM-LEGACY 2005
- TAX-MID 5K Thoracic Surgery
- RX-TRACE 92
- BOOK-THIN 250 in Ohio
- PHOTO-ENUM David Arzouman · 2005
Christopher Riordan, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
92 ≥ 0th percentile 0% of 1,370,886 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. 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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Christopher Riordan, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - 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 Christopher Riordan, MD?
Quality data not reportedPrimary specialty
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician
Medicare Part D claims
92 28% vs specialty avg
Specialty distribution in Ohio
How Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician compares to other specialties among Ohio providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician. Verify directly:
How MIPS and board certification work
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).
Practice Address
Provider Details
| NPI | 1972509560 |
|---|---|
| Specialty | Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/28/2005 |
Hospital and facility affiliations
Facilities where Christopher Riordan, MD 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.
Promedica Central Physicians
Toledo, OH
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 Christopher Riordan, MD. Source: openpaymentsdata.cms.gov.
Total received
$100
Largest payer
ATRICURE, INC.
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 - Ohio OMB 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 ~48K Ohio medical licensees in 2023 - they are NOT specific to Christopher Riordan, MD. To verify Christopher Riordan, MD's current license status, search the OMB public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
158
Total board actions, Ohio 2023
Across 154 cases
3.29
Actions per 1,000 licensees
Ohio statewide rate
probation
Most common action type
56 cases
OMB 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 Ohio disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
92
Total Claims
$934
Total Drug Cost
55
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 92
- Total Day Supply
- 885
- Generic Drug Cost
- $825
Patient Demographics
- Average Patient Age
- 72.8 years
- Avg HCC Risk Score
- 1.17
- Gender Split
- 40% female / 60% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Mupirocin | 49 |
| Metoprolol Tartrate | 27 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in OH →
All providers in Ohio →
Compare specialties →
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Overview
How Christopher Riordan, MD fits within the Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician landscape nationally.
5,070
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Providers in US
52
States with Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician
128
Avg Claims per Provider
Christopher Riordan, MD's 92 claims are below the specialty average of 128.
Nationwide Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Riordan, both outside Ohio so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Providers in Ohio
Other clinicians with the same primary specialty enrolled in Ohio, drawn from the same CMS NPPES roster as Riordan.
One of 250 Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers enrolled in Ohio, 5 are shown here.
Frequently Asked Questions
What is Christopher Riordan, MD's specialty? ▼
Christopher Riordan, MD specializes in Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician and practices in Toledo, Ohio. Credentials: MD.
How much does Christopher Riordan, MD prescribe under Medicare Part D? ▼
In 2023, Christopher Riordan, MD wrote 92 Medicare Part D claims totaling $934 in drug costs for 55 beneficiaries.
Where is Christopher Riordan, MD located? ▼
Christopher Riordan, MD is located at 2109 HUGHES DR, Toledo, OH, 43606. Phone: (419) 291-2077.
What is Christopher Riordan, MD's NPI number? ▼
Christopher Riordan, MD's National Provider Identifier (NPI) is 1972509560, issued on 06/28/2005.
How many Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers are there in the US? ▼
There are 5,070 Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers across 52 states in the US. The average Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician provider writes 128 Medicare Part D claims per year.
What drugs does Christopher Riordan, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Christopher Riordan, MD's most frequently prescribed drugs include Mupirocin, Metoprolol Tartrate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Christopher Riordan, MD accept Medicare? ▼
Christopher Riordan, MD appears in CMS Medicare data with 92 Part D claims and 55 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Christopher Riordan, MD's credentials? ▼
Christopher Riordan, MD's NPI is 1972509560 with credentials MD. 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
View source datasets and methodology notes
- 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.
- 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
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.