Mary Katherine Kosowski, A-GNP-C
Adult Health Nurse Practitioner · West Seneca, NY
Mary Katherine Kosowski, A-GNP-C is an adult health nurse practitioner with a practice address in West Seneca, New York, and NPI 1558937441, issued on Jun 1, 2021. Check the license (New York F309522-01, as entered in NPPES) with the New York board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Katherine Kosowski
- Credential
- A-GNP-C
- Primary taxonomy
- Adult Health Nurse Practitioner 363LA2200X
- License number
- F309522-01 NY
Self-reported in NPPES; status is on the state search - Practice location
- 600 Harlem RD, West Seneca, NY 14224
- Phone
- (716) 332-2121
- Enumerated
- Jun 1, 2021
- Record last updated
- Aug 28, 2025
- Fax
- (716) 332-2122
- Medicare enrollment
- Enrolled (PECOS I20220208000559); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest adult health nurse practitioner records → All 6,028 in New York → Look up another NPI →
Also registered at 600 Harlem RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Toni Murphy, D.OEndocrinology, Diabetes & Metabolism Physician1003862897
- Patricia Parysek, N.P.Family Nurse Practitioner1205880770
- Raffaele Ruggiero, M.D.Endocrinology, Diabetes & Metabolism Physician1457814196
Verify Mary Katherine Kosowski 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 F309522-01Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.0 times the Medicare Part D claims of the average adult health nurse practitioner in 2024
3,807 Medicare Part D claims for 703 beneficiaries, against an average of 1,280 among the 16,937 providers of this specialty who prescribed in Part D. Brand-name drugs were 58% of claims.
Most prescribed
- Levothyroxine Sodium558 claims
- Ozempic252 claims
- Lantus Solostar245 claims
- Mounjaro224 claims
- Trulicity215 claims
- Jardiance213 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: $493.47
23 payments; by number, the most common kind was food and beverage; the largest payer was Medtronic, Inc. The 12,291 providers of this specialty with any payment received $946.40 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Trinity Medical Wny PCWest Seneca, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Katherine Kosowski among 6,028 adult health nurse practitioner records in New York
Mary Katherine Kosowski, A-GNP-C is one of 6,028 adult health nurse practitioner records with a practice address in New York. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 78% of them.
- NPI issued2021 · 78% of these records are older, 16% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 44% of these records are
- Graduated2019 · median 2016 among the 2,678 with a school on file
- Record last updated2025 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LA2200X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Adult Health Nurse Practitioner providers in New York
There are 6,028 adult health nurse practitioner records in New York.
All 6,028 in New York → Every provider in West Seneca → Adult Health Nurse Practitioner nationwide →
The 8 adult health nurse practitioner records with the nearest ZIP codes
- Linda Blazier, NPWest Seneca, NY 142241295946192
- Mary Bracken, A.N.P.West Seneca, NY 142241376505099
- Gwen Bruno, ADULT NURSE PRACTITIWest Seneca, NY 142241841470101
- Karee Chella, ANP-BC, RNFAWest Seneca, NY 142241639433170
- Marcia Krzywicki, ANPWest Seneca, NY 142241487654802
- Heather LearyWest Seneca, NY 142241760874390
- Susan Rajczak, ANPWest Seneca, NY 142241578563995
- Suzanne Stoklosa, NPWest Seneca, NY 142241780724310
Common questions
What is Mary Katherine Kosowski, A-GNP-C's NPI number?
Mary Katherine Kosowski, A-GNP-C's National Provider Identifier (NPI) is 1558937441, issued on Jun 1, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Mary Katherine Kosowski, A-GNP-C located?
The NPPES record lists a practice address at 600 Harlem RD, West Seneca, NY, 14224. Phone: (716) 332-2121. Providers update this record themselves, so call before visiting.
How can I verify Mary Katherine Kosowski, A-GNP-C's license?
NPPES lists New York license number F309522-01, as entered by the provider. Search the New York board that licenses this profession; the NPPES record confirms identity only.
How much does Mary Katherine Kosowski, A-GNP-C prescribe under Medicare Part D?
In 2024, Mary Katherine Kosowski, A-GNP-C had 3,807 Medicare Part D claims for 703 beneficiaries; the average among adult health nurse practitioner prescribers was 1,280. 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.