Mark Sieminski, MD
Emergency Medicine Physician · Cheektowaga, NY
Mark Sieminski, MD is an emergency medicine physician with a practice address in Cheektowaga, New York, and NPI 1003057779, issued on Mar 10, 2009. Check the license on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Mark Sieminski
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 125051569 IL
Self-reported in NPPES; status is on the state search - Practice location
- 305 Cayuga RD, Cheektowaga, NY 14225
- Phone
- (716) 580-1813
- Enumerated
- Mar 10, 2009
- Record last updated
- Oct 20, 2009 (not updated in 17 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20090630000395); accepts Medicare assignment
- Medical or professional school
- University Of Virginia School Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 5,025 in New York → Look up another NPI →
Verify Mark Sieminski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the ProfessionsCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
55% fewer Medicare Part D claims than the average emergency medicine physician in 2024
102 Medicare Part D claims for 82 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 16 claims were for opioids.
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.
Bills Medicare through one group practice
- University Emergency Medical Services Inc.Buffalo, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Sieminski among 5,025 emergency medicine physician records in New York
Mark Sieminski, MD is one of 5,025 emergency medicine physician records with a practice address in New York. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 42% of them.
- NPI issued2009 · 42% of these records are older, 56% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2005 · median 2013 among the 3,232 with a school on file
- Record last updated2009 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in New York
There are 5,025 emergency medicine physician records in New York.
All 5,025 in New York → Every provider in Cheektowaga → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Amy Corson, P.A.Cheektowaga, NY 142251972731875
- Jessica Ede, M.D.Cheektowaga, NY 142251619382744
- Steven Gasiewicz, MDCheektowaga, NY 142251457303521
- Jennifer Geiger, MDCheektowaga, NY 142251710957063
- Stephen Lopez, MDCheektowaga, NY 142251942212329
- Richard Hallock, MDAmherst, NY 142261043570872
- David Johnson, MDAmherst, NY 142261053370908
- Michael Martin, MDAmherst, NY 142261487688917
Common questions
What is Mark Sieminski, MD's NPI number?
Mark Sieminski, MD's National Provider Identifier (NPI) is 1003057779, issued on Mar 10, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Mark Sieminski, MD located?
The NPPES record lists a practice address at 305 Cayuga RD, Cheektowaga, NY, 14225. Phone: (716) 580-1813. Providers update this record themselves, so call before visiting.
How can I verify Mark Sieminski, MD's license?
Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Sieminski, MD prescribe under Medicare Part D?
In 2024, Mark Sieminski, MD had 102 Medicare Part D claims for 82 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.
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.