NPPES file of Aug 9, 2026

Timothy Lee Irwin, M.D.

Cardiovascular Disease Physician · Yankton, SD

Timothy Lee Irwin, M.D. is a cardiovascular disease physician with a practice address in Yankton, South Dakota, and NPI 1063622801, issued on May 23, 2007. Check the license (South Dakota 8218, as entered in NPPES) on the South Dakota Board of Medical and Osteopathic Examiners; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1063622801
Name
Timothy Lee Irwin
Credential
M.D.
Primary taxonomy
Cardiovascular Disease Physician 207RC0000X
License number
8218 SD
Self-reported in NPPES; status is on the state search
Practice location
1104 W 8TH St, Yankton, SD 57078
Phone
(605) 665-7841
Enumerated
May 23, 2007
Record last updated
May 19, 2022
Fax
(605) 665-0546
Medicare enrollment
Enrolled (PECOS I20120808000780); accepts Medicare assignment
Medical or professional school
University Of Iowa, Rj & L Carver College Of Medicine, 2005
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest cardiovascular disease physician records → All 45 in South Dakota → Look up another NPI →

Also registered at 1104 W 8TH St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Brent Adams, MDOrthopaedic Surgery Physician1093930521
  2. Cassandra Arens, PAPhysician Assistant1033522966
  3. Sarah ArensPhysician Assistant1669912291
  4. Amber Authier, PA-CMedical Physician Assistant1518679851
  5. Clarissa Barnes, M.D.Internal Medicine Physician1770758757
  6. Leann Bassing, M.D.Rheumatology Physician1871784124

Verify Timothy Lee Irwin in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersSouth Dakota Board of Medical and Osteopathic Examiners
    Search for license 8218    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the South Dakota license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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2.6 times the Medicare Part D claims of the average cardiovascular disease physician in 2024

7,970 Medicare Part D claims for 924 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.

  1. Timothy Irwin7,970
  2. Specialty average3,078

Most prescribed

  1. Eliquis978 claims
  2. Atorvastatin Calcium611 claims
  3. Metoprolol Succinate536 claims
  4. Rosuvastatin Calcium509 claims
  5. Warfarin Sodium392 claims
  6. Spironolactone347 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $128.16

4 payments; by number, the most common kind was food and beverage; the largest payer was DePuy Synthes Sales Inc. The 16,686 providers of this specialty with any payment received $3,819.56 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Timothy Irwin$128.16
  2. Specialty average$3,819.56

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through 2 group practices

  1. Sacred Heart Health ServicesYankton, SD
  2. Yankton Medical Clinic PCYankton, SD

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Timothy Lee Irwin among 45 cardiovascular disease physician records in South Dakota

Timothy Lee Irwin, M.D. is one of 45 cardiovascular disease physician records with a practice address in South Dakota. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 56% of them.

  • NPI issued2007 · 56% of these records are older, 31% newer
  • In a Medicare fileYes · 82% of these records are
  • In the CMS Doctors and Clinicians fileYes · 67% of these records are
  • Graduated2005 · median 1996 among the 30 with a school on file
  • Record last updated2022 · 60% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a South Dakota practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Cardiovascular Disease Physician providers in South Dakota

There are 45 cardiovascular disease physician records in South Dakota.

All 45 in South Dakota → Every provider in Yankton → Cardiovascular Disease Physician nationwide →

The 8 cardiovascular disease physician records with the nearest ZIP codes

  1. Venkata Siva Kumar Pajjuru, MDYankton, SD 570781720565831
  2. Udit Bhatnagar, MDSioux Falls, SD 571051386087963
  3. Donald Bishop, MDSioux Falls, SD 571051447304076
  4. Richard Clark, M.D.Sioux Falls, SD 571051457466617
  5. Riaz Mahmood, DOSioux Falls, SD 571051184184061
  6. James Olson, MDSioux Falls, SD 571051649219601
  7. Naveen Rajpurohit, M.D.Sioux Falls, SD 571051235369950
  8. Mahmoud Sharaf, M.D.Sioux Falls, SD 571051356677447

Common questions

What is Timothy Lee Irwin, M.D.'s NPI number?

Timothy Lee Irwin, M.D.'s National Provider Identifier (NPI) is 1063622801, issued on May 23, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Timothy Lee Irwin, M.D. located?

The NPPES record lists a practice address at 1104 W 8TH St, Yankton, SD, 57078. Phone: (605) 665-7841. Providers update this record themselves, so call before visiting.

How can I verify Timothy Lee Irwin, M.D.'s license?

NPPES lists South Dakota license number 8218, as entered by the provider. Search the South Dakota Board of Medical and Osteopathic Examiners at https://www.sdbmoe.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Timothy Lee Irwin, M.D. prescribe under Medicare Part D?

In 2024, Timothy Lee Irwin, M.D. had 7,970 Medicare Part D claims for 924 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.