Mark P. Hoornstra, M.D.
Emergency Medical Services (Emergency Medicine) Physician · Roslyn, NY
Mark P. Hoornstra, M.D. is an emergency medical services (emergency medicine) physician with a practice address in Roslyn, New York, and NPI 1255498580, issued on Jan 3, 2007. Check the license (New York 187340-1, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Mark P. Hoornstra
- Credential
- M.D.
- Primary taxonomy
- Emergency Medical Services (Emergency Medicine) Physician 207PE0004X
- License number
- 187340-1 NY
Self-reported in NPPES; status is on the state search - Practice location
- 100 Port Washington Blvd, Roslyn, NY 11576
- Phone
- (516) 562-6605
- Enumerated
- Jan 3, 2007
- Record last updated
- Feb 2, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (516) 629-2027
- Medicaid ID
- 01298902 NY
- Entity
- Type 1 · individual
8 nearest emergency medical services (emergency medicine) physician records → All 169 in New York → Look up another NPI →
Also registered at 100 Port Washington Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Nicole Afonso, PAPhysician Assistant1568894160
- Alina Agnello, PA-CMedical Physician Assistant1487025581
- Tahir Ahmad, M.D.Critical Care Medicine (Internal Medicine) Physician1578950218
- Zaid Ahmad, M.D.Anesthesiology Physician1871507947
Verify Mark P. Hoornstra in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 187340-1Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% fewer Medicare Part D claims than the average emergency medical services (emergency medicine) physician in 2024
49 Medicare Part D claims, against an average of 292 among the 1,653 providers of this specialty who prescribed in Part D. Brand-name drugs were 35% of claims.
Most prescribed
- Bupropion Xl12 claims
- Albuterol Sulfate Hfa11 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.
Mark P. Hoornstra among 169 emergency medical services (emergency medicine) physician records in New York
Mark P. Hoornstra, M.D. is one of 169 emergency medical services (emergency medicine) physician records with a practice address in New York. 64% 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 67% of them.
- NPI issued2007 · 67% of these records are older, 27% newer
- In a Medicare fileYes · 64% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2009 · 75% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207PE0004X 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 Medical Services (Emergency Medicine) Physician providers in New York
There are 169 emergency medical services (emergency medicine) physician records in New York.
All 169 in New York → Every provider in Roslyn → Emergency Medical Services (Emergency Medicine) Physician nationwide →
The 8 emergency medical services (emergency medicine) physician records with the nearest ZIP codes
- Leila Schneitzer, M.D.Roslyn, NY 115761144387317
- Scott Strumpfler, M.D.Roslyn, NY 115761689721763
- Brendan McElroy, MDMineola, NY 115011932113065
- Abigail Assenza, PA-CFar Rockaway, NY 116911295689982
- Scott Flashner, MDAmityville, NY 117011023102142
- Marc Zwillenberg, MDJamaica, NY 114321063919496
- Lori Jimenez-Estrada, RNCoram, NY 117271891509881
- Annmarie KeaneJamaica, NY 114181205092285
Common questions
What is Mark P. Hoornstra, M.D.'s NPI number?
Mark P. Hoornstra, M.D.'s National Provider Identifier (NPI) is 1255498580, issued on Jan 3, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mark P. Hoornstra, M.D. located?
The NPPES record lists a practice address at 100 Port Washington Blvd, Roslyn, NY, 11576. Phone: (516) 562-6605. Providers update this record themselves, so call before visiting.
How can I verify Mark P. Hoornstra, M.D.'s license?
NPPES lists New York license number 187340-1, as entered by the provider. 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 P. Hoornstra, M.D. prescribe under Medicare Part D?
In 2024, Mark P. Hoornstra, M.D. had 49 Medicare Part D claims; the average among emergency medical services (emergency medicine) physician prescribers was 292. 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.