Mark Grzesiak, RPAC
Physician Assistant · Mineola, NY
Mark Grzesiak, RPAC is a physician assistant with a practice address in Mineola, New York, and NPI 1376717272, issued on Apr 22, 2008. Check the license (New York 010785, as entered in NPPES) with the New York board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark Grzesiak
- Credential
- RPAC
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 010785 NY
Self-reported in NPPES; status is on the state search - Practice location
- 259 1St St, Mineola, NY 11501
- Phone
- (516) 663-8312
- Enumerated
- Apr 22, 2008
- Record last updated
- Apr 22, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (516) 663-2184
- Medicare enrollment
- Enrolled (PECOS I20100720000770); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 15,555 in New York → Look up another NPI →
Also registered at 259 1St St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Olukemi Adebanjo, RNMedical-Surgical Registered Nurse1689241564
Verify Mark Grzesiak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New York board licenses this profession
Search for license 010785Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% more Medicare Part D claims than the average physician assistant in 2024
912 Medicare Part D claims for 266 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 91 claims were for opioids.
Most prescribed
- Ondansetron Odt105 claims
- Olanzapine69 claims
- Oxycodone Hcl56 claims
- Eliquis43 claims
- Prochlorperazine Maleate40 claims
- Potassium Chloride38 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 74.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- North Shore Health System Medical Faculty Group Practice IncBay Shore, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Grzesiak among 15,555 physician assistant records in New York
Mark Grzesiak, RPAC is one of 15,555 physician assistant records with a practice address in New York. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 20% of them.
- NPI issued2008 · 20% of these records are older, 77% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated2005 · median 2018 among the 8,158 with a school on file
- Record last updated2008 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
240 physician assistant records list a practice address in Mineola
They are 240 of the 2,077 NPPES records with a practice address in Mineola, and 15,555 physician assistant records in New York.
All 15,555 in New York → Every provider in Mineola → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Susan Chung, P.A.Mineola, NY 115011821044967
- Vincent Gandolfo, PAMineola, NY 115011417069667
- Jean Graham, PAMineola, NY 115011184675043
- Gary Guja, PAMineola, NY 115011417069675
- Heidi Hess, PA-CMineola, NY 115011699748293
- Melanie Hodge-Randazzo, PAMineola, NY 115011750300265
- Edward Koenig, PAMineola, NY 115011558312223
- David Laspina, RPA-CMineola, NY 115011639281884
Common questions
What is Mark Grzesiak, RPAC's NPI number?
Mark Grzesiak, RPAC's National Provider Identifier (NPI) is 1376717272, issued on Apr 22, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Mark Grzesiak, RPAC located?
The NPPES record lists a practice address at 259 1St St, Mineola, NY, 11501. Phone: (516) 663-8312. Providers update this record themselves, so call before visiting.
How can I verify Mark Grzesiak, RPAC's license?
NPPES lists New York license number 010785, as entered by the provider. Search the New York board that licenses this profession; the NPPES record confirms identity only.
How much does Mark Grzesiak, RPAC prescribe under Medicare Part D?
In 2024, Mark Grzesiak, RPAC had 912 Medicare Part D claims for 266 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Mark Grzesiak, RPAC's MIPS final score?
The 2023 MIPS final score is 74.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.