NPI registry status
Active
2026 NPPES data Cardiovascular Disease Physician NPI 1063622801 M.D.
Verify on CMS → Timothy Irwin, M.D.
Cardiovascular Disease Physician in Yankton, South Dakota.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 24,795 in Cardiovascular Disease 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
8K
Medicare Part D claims · 873 beneficiaries · Cardiovascular Disease Physician avg: 3K
Industry payments
$128.16
4 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Timothy Irwin, M.D. filed 8,094 Medicare Part D claims in 2023 as a Cardiovascular Disease Physician in Yankton, South Dakota.
- 8K
- Part D claims, 2023
- 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.
Timothy Irwin, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
8,094 Top 3% higher than 97% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Timothy Irwin, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 Timothy Irwin, M.D.?
Quality data not reportedPrimary specialty
Cardiovascular Disease Physician
Medicare Part D claims
8,094 167% vs specialty avg
Specialty distribution in South Dakota
How Cardiovascular Disease Physician compares to other specialties among South Dakota 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 Cardiovascular Disease 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).
Timothy Irwin, M.D. appears in the CMS NPPES registry as a Cardiovascular Disease Physician provider holding M.D. credentials at 1104 W 8TH ST, Yankton, SD, 57078, with a listed phone of (605) 665-7841. NPI 1063622801 was issued on 05/23/2007.
Medicare Part D records for calendar year 2023 show 8,094 prescription claims written by this provider, covering 873 Medicare beneficiaries and totaling roughly $1.9 million in drug spend.
Cardiovascular Disease Physician is a mid-sized specialty nationwide, with 24,795 enrolled providers across 54 states and an average of 3,033 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
Provider Details
| NPI | 1063622801 |
|---|---|
| Specialty | Cardiovascular Disease Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/23/2007 |
Hospital and facility affiliations
Facilities where Timothy Irwin, M.D. 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.
Sacred Heart Health Services
Yankton, SD
Yankton Medical Clinic PC
Yankton, SD
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 Timothy Irwin, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$128
Largest payer
DePuy Synthes Sales 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
8,094
Total Claims
$1.9M
Total Drug Cost
873
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 17,868
- Total Day Supply
- 529,104
- Generic Drug Cost
- $146K
- Antibiotic Claims
- 13
Patient Demographics
- Average Patient Age
- 76.2 years
- Avg HCC Risk Score
- 1.44
- Gender Split
- 44% female / 56% male
- Age Distribution
- <65: 37, 65-74: 359, 75-84: 330, 85+: 147
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Timothy Irwin, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Eliquis
Eliquis
944 claims
- Metoprolol Succinate
Metoprolol Succinate
579 claims
- Atorvastatin Calcium
Atorvastatin Calcium
571 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
500 claims
- Warfarin Sodium
Warfarin Sodium
410 claims
- Spironolactone
Spironolactone
407 claims
- Flecainide Acetate 306
Flecainide Acetate
306 claims
- Amlodipine Besylate 305
Amlodipine Besylate
305 claims
| Drug | Claims |
|---|---|
| Eliquis Apixaban | 944 |
| Metoprolol Succinate | 579 |
| Atorvastatin Calcium | 571 |
| Rosuvastatin Calcium | 500 |
| Warfarin Sodium | 410 |
| Spironolactone | 407 |
| Flecainide Acetate | 306 |
| Amlodipine Besylate | 305 |
| Metoprolol Tartrate | 303 |
| Lisinopril | 297 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Cardiovascular Disease Physician Overview
How Timothy Irwin, M.D. fits within the Cardiovascular Disease Physician landscape nationally.
24,795
Cardiovascular Disease Physician Providers in US
54
States with Cardiovascular Disease Physician
3,033
Avg Claims per Provider
Timothy Irwin, M.D.'s 8,094 claims are above the specialty average of 3,033.
Nearby Cardiovascular Disease Physician Providers in South Dakota
Other clinicians with the same primary specialty enrolled in South Dakota, drawn from the same CMS NPPES roster as Irwin.
Dr. Udit Bhatnagar
MD
Sioux Falls, SD
Dr. Donald Bishop
MD
Sioux Falls, SD
Dr. Amid Bitar
MD
Rapid City, SD
Dr. Sherrie Brooks
D.O.,FACC,FACOI
Sioux Falls, SD
Dr. Paul Carpenter
MD
Sioux Falls, SD
Compare Cardiovascular Disease Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the South Dakota medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Cardiovascular Disease Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Timothy Irwin, M.D.'s specialty? ▼
Timothy Irwin, M.D. specializes in Cardiovascular Disease Physician and practices in Yankton, South Dakota. Credentials: M.D..
How much does Timothy Irwin, M.D. prescribe under Medicare Part D? ▼
In 2023, Timothy Irwin, M.D. wrote 8,094 Medicare Part D claims totaling $1.9M in drug costs for 873 beneficiaries.
Where is Timothy Irwin, M.D. located? ▼
Timothy Irwin, M.D. is located at 1104 W 8TH ST, Yankton, SD, 57078. Phone: (605) 665-7841.
What is Timothy Irwin, M.D.'s NPI number? ▼
Timothy Irwin, M.D.'s National Provider Identifier (NPI) is 1063622801, issued on 05/23/2007.
How many Cardiovascular Disease Physician providers are there in the US? ▼
There are 24,795 Cardiovascular Disease Physician providers across 54 states in the US. The average Cardiovascular Disease Physician provider writes 3,033 Medicare Part D claims per year.
What drugs does Timothy Irwin, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Timothy Irwin, M.D.'s most frequently prescribed drugs include Eliquis, Metoprolol Succinate, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Timothy Irwin, M.D. accept Medicare? ▼
Timothy Irwin, M.D. appears in CMS Medicare data with 8,094 Part D claims and 873 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Timothy Irwin, M.D.'s credentials? ▼
Timothy Irwin, M.D.'s NPI is 1063622801 with credentials M.D.. 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
Compiled from official public sources by the PlainDoctor editorial team.