MRS. MARY KATHERINE KOSOWSKI A-GNP-C
NPI 1558937441
Nurse Practitioner - Adult Health in West Seneca, NY

Q: What is Mary Katherine Kosowski's NPI number?

The NPI number for Mary Katherine Kosowski is 1558937441. It was assigned to this individual provider in the NPPES registry on June 1, 2021.

Q: What is Mary Katherine Kosowski's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Adult Health, with taxonomy code 363LA2200X.

Active since June 01, 2021PECOS EnrolledAccepts Medicare Assignment

600 HARLEM RD, WEST SENECA, NY 14224(716) 332-2121(716) 332-2122 Get Directions Write a Review

NPPES record last updated: August 28, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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About Mrs. Mary Katherine Kosowski A-gnp-c NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MRS. MARY KATHERINE KOSOWSKI A-GNP-C (NPI 1558937441) is an individual adult health provider in West Seneca, New York, licensed in New York (F309522-01) and active in the NPI registry since June 2021. She is enrolled in Medicare PECOS, is affiliated with Kaleida Health, and maintains a secondary practice location in Buffalo.

NPPES Registry Identity

NPI1558937441

Entity TypeIndividualFemale

Primary Taxonomy363LA2200X

Provider Legal NameMRS. MARY KATHERINE KOSOWSKICredential: A-GNP-C

Location Address600 HARLEM RDWest Seneca, NY 14224-1151

Mailing Address600 Harlem RdWest Seneca, NY 14224-1151 · (716) 332-2121 · Fax (716) 332-2122

Phone(716) 332-2121

Fax(716) 332-2122

Sole ProprietorNo

Medical School CMSOtherGraduated 2019

Enumeration DateJune 1, 2021

Last NPPES UpdateAugust 28, 2025

NPPES CertifiedAugust 28, 2025

✔ NPI 1558937441 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Adult HealthPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363LA2200X

License✔ Licensed in NY · F309522-01

600 HARLEM RD, West Seneca, NY 14224

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Secondary Practice Location 1

Location 134 Benwood AveBuffalo, NY 14214-1761 · Phone (716) 986-9199

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mrs. Mary Katherine Kosowski A-gnp-c is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8527451921

PECOS Enrollment IDI20220208000559

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 3

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

150 services111 patients

Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report 95251

This procedure involves placing a small sensor under your skin to continuously monitor your blood sugar levels in tissue fluid. The data is interpreted and a report is generated to help manage your diabetes more effectively.

39 services24 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

19 services17 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Kaleida Health

Acute Care Hospitals · Buffalo, NY

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number330005

Location100 High StreetBuffalo, NY 14210 · Erie County

Emergency services Birthing friendly

Sisters Of Charity Hospital

Acute Care Hospitals · Buffalo, NY

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number330078

Location2157 Main StreetBuffalo, NY 14214 · Erie County

Emergency services Birthing friendly

Kenmore Mercy Hospital

Acute Care Hospitals · Kenmore, NY

2/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number330102

Location2950 Elmwood AvenueKenmore, NY 14217 · Erie County

Emergency services

Brooks-Tlc Hospital System, Inc

Acute Care Hospitals · Dunkirk, NY

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number330229

Location529 Central AvenueDunkirk, NY 14048 · Chautauqua County

Emergency services

Mercy Hospital Of Buffalo

Acute Care Hospitals · Buffalo, NY

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number330279

Location565 Abbott RoadBuffalo, NY 14220 · Erie County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 14224 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$84.93 typical visit price

range $54.87 – $166.88

Typical copayment $21.23 (range $13.71 – $41.72)

Most-billed visit code 99203

Established Patient

$97.08 typical visit price

range $17.54 – $136.14

Typical copayment $24.27 (range $4.38 – $34.03)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 7

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

TONI M MURPHY D.O

Internal Medicine (Endocrinology, Diabetes & Metabolism)

600 HARLEM RD
WEST SENECA, NY 14224

Erie County (716) 332-2121

MS. ANNE MARIE VERONICA BANTLE FNP

Nurse Practitioner (Family)

600 HARLEM RD
WEST SENECA, NY 14224

Erie County (716) 332-2121

PATRICIA M PARYSEK N.P.

Nurse Practitioner (Family)

600 HARLEM RD
WEST SENECA, NY 14224

Erie County (716) 332-2121

DANIEL PLUMERI PA-C

Physician Assistant

600 HARLEM RD
BUFFALO, NY 14224

Erie County (716) 332-2121

DR. RAFFAELE RUGGIERO M.D.

Internal Medicine (Endocrinology, Diabetes & Metabolism)

600 HARLEM RD
WEST SENECA, NY 14224

Erie County (716) 322-2121

BUFFALO ENDOCRINOLOGY, L.L.C.

Internal Medicine (Endocrinology, Diabetes & Metabolism)

600 HARLEM RD
WEST SENECA, NY 14224

Erie County (716) 332-2121

KATLYN HOLT PA

Physician Assistant

600 HARLEM RD
WEST SENECA, NY 14224

Erie County (716) 631-8400

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mary Katherine Kosowski's NPI number?

The NPI number for Mary Katherine Kosowski is 1558937441. It was assigned to this individual provider in the NPPES registry on June 1, 2021.

Where is Mary Katherine Kosowski located?

Mary Katherine Kosowski practices at 600 Harlem Rd, West Seneca, NY 14224. The listed phone number is (716) 332-2121.

What is Mary Katherine Kosowski's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Adult Health, with taxonomy code 363LA2200X.

Is Mary Katherine Kosowski enrolled in Medicare?

Yes. Mary Katherine Kosowski is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Is Mary Katherine Kosowski affiliated with any hospitals?

According to CMS data, Mary Katherine Kosowski is affiliated with Kaleida Health, Sisters Of Charity Hospital, Kenmore Mercy Hospital, Brooks-Tlc Hospital System, Inc and Mercy Hospital Of Buffalo.

When was this NPI record last updated?

The NPPES record for Mary Katherine Kosowski was last updated on August 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.