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MRS. AGNIESZKA KATARZYNA KOWALSKA MD
NPI 1538320189
Psychiatry & Neurology - Neurology in Stony Brook, NY

Active since June 17, 2008PECOS EnrolledAccepts Medicare Assignment
98.52/100
CMS Quality Rating
STONY BROOK UNIVERSITY HOSPITAL, DEPT OF NEUROLOGY HSC T12 020, STONY BROOK, NY 11794(631) 444-2599(631) 444-1474 Get Directions Write a Review

NPPES record last updated: October 18, 2013. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Mrs. Agnieszka Katarzyna Kowalska Md NPPES

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

MRS. AGNIESZKA KATARZYNA KOWALSKA MD (NPI 1538320189) is an individual neurology provider in Stony Brook, New York, licensed in New York (248640) and active in the NPI registry since June 2008. She is enrolled in Medicare PECOS, is affiliated with Suny/stony Brook University Hospital, and is a graduate of Other (2004).

NPPES Registry Identity

NPI1538320189
Entity TypeIndividualFemale
Primary Taxonomy2084N0400X
Provider Legal NameMRS. AGNIESZKA KATARZYNA KOWALSKACredential: MD
Location AddressSTONY BROOK UNIVERSITY HOSPITAL, DEPT OF NEUROLOGY HSC T12 020Stony Brook, NY 11794-8121
Mailing AddressHsc T12 020 Department Of Neurology, Stony Brook University HospitalStony Brook, NY 11794-7148 · (631) 444-7878 · Fax (631) 444-6031
Phone(631) 444-2599
Fax(631) 444-1474
Sole ProprietorNo
Medical School CMSOtherGraduated 2004
Enumeration DateJune 17, 2008
Last NPPES UpdateOctober 18, 2013
✔ NPI 1538320189 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · NeurologyAllopathic & Osteopathic Physicians
Taxonomy Code2084N0400X
License✔ Licensed in NY · 248640
Definition
A Neurologist specializes in the diagnosis and treatment of diseases or impaired function of the brain, spinal cord, peripheral nerves, muscles, autonomic nervous system, and blood vessels that relate to these structures.
STONY BROOK UNIVERSITY HOSPITAL, Stony Brook, NY 11794
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mrs. Agnieszka Katarzyna Kowalska Md 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 ID42366106
PECOS Enrollment IDI20090915000698
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.

Medicare Billing Reassignment

Medicare enrollment records show Agnieszka Kowalska reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Neurology Associates Of Stony Brook, University Faculty Practice Corpo
Same address
Neurology
101 NICOLLS RD RM 20
Stony Brook, NY 11794
  • Reassigned Medicare billing, New York enrollment
  • 59 clinicians in this Medicare group
NPI 1699720888 (631) 444-2599

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 13

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.

Injection, onabotulinumtoxina, 1 unit J0585
Onabotulinumtoxina, also known as Botox, is a medication injected into muscles. It's used to treat various conditions by blocking nerve activity in the muscles, causing a temporary reduction in muscle activity. The units refer to the dosage.
9,600 services18 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.
256 services150 patients
Infusion, normal saline solution, 250 cc J7050
An infusion of normal saline solution, 250 cc, involves administering a sterile saltwater solution into your body through a vein, usually in your arm. This helps to replenish fluids, maintain hydration, and balance electrolytes in your body.
90 services37 patients
Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less 96365
This is a procedure where a medical professional inserts a small tube into your vein to deliver medication, nutrients, or fluids directly into your bloodstream. This can be for treatment, prevention, or diagnosis. The process typically takes less than an hour.
73 services30 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
51 services48 patients
Injection of chemical for paralysis of facial and neck nerve muscles on both sides of face 64615
This procedure involves injecting a chemical into specific facial and neck muscles, causing temporary paralysis. This helps reduce muscle activity and can alleviate certain medical conditions. Both sides of the face are treated for a balanced result.
46 services17 patients

Hospital Affiliations CMS Care Compare

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

Suny/Stony Brook University Hospital

Acute Care Hospitals · Stony Brook, NY
4/5 CMS rating
OwnershipGovernment - State
CMS Certification Number330393
LocationHealth Sciences Center SunyStony Brook, NY 11794 · Suffolk County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11794 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
$154.28 typical visit price
range $67.40 – $203.53
Typical copayment $38.57 (range $16.85 – $50.88)
Most-billed visit code 99204
Established Patient
$117.62 typical visit price
range $21.66 – $164.45
Typical copayment $29.40 (range $5.41 – $41.11)
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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

98.52/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality82.85
Promoting Interoperability100
Improvement Activities40

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Temozolomide, oral, 5 mg J8700
Treatment-Treatment - Miscellaneous · category RX000N
3 suppliers34 claims3,915 services$0.47 avg. paid by Medicare
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for the first prescription in a 30-day period Q0511
Treatment-Chemotherapy · category RH012N
3 suppliers14 claims14 services$19.01 avg. paid by Medicare
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for a subsequent prescription in a 30-day period Q0512
Treatment-Chemotherapy · category RH012N
2 suppliers25 claims25 services$12.61 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

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

DR. BENJAMIN RICHARD HODSON M.D.
Emergency Medicine
STONY BROOK UNIVERSITY HOSPITAL, MEDICAL STAFF OFFICE T9
STONY BROOK, NY 11794
Suffolk County (631) 444-2754
LUCAS JAMES MCARTHUR M.D.
Family Medicine
STONY BROOK UNIVERSITY HOSPITAL, MEDICAL STAFF OFFICE T14
STONY BROOK, NY 11794
Suffolk County (631) 444-2754
JEFF SEAN CHUANG MD
Student in an Organized Health Care Education/Training Program
STONY BROOK UNIVERSITY HOSPITAL, MEDICAL STAFF OFFICE
STONY BROOK, NY 11794
Suffolk County (631) 444-2754
MISS SARAH ROSE PESTIEAU M.D.
Internal Medicine
STONY BROOK UNIVERSITY HOSPITAL, DEPARTMENT OF MEDICINE HSC-T16 020
STONY BROOK, NY 11794
Suffolk County (631) 444-1106
DR. ELAINE FOX M.D.
Student in an Organized Health Care Education/Training Program
STONY BROOK UNIVERSITY HOSPITAL, MEDICAL STAFF OFFICE T14
STONY BROOK, NY 11794
Suffolk County (631) 444-2754
DR. LAWRENCE WILLIAM KELLY JR. MD
Emergency Medicine
STONY BROOK UNIVERSITY HOSPITAL, DEPARTMENT OF EMERGENCY MEDICINE, HSC, L-4, ROOM 080
STONY BROOK, NY 11794
Suffolk County (631) 444-3880
MRS. SUZETTE CATHERINE SMOOKLER M.S., R.D., CDN
Dietitian, Registered
STONY BROOK UNIVERSITY HOSPITAL, NICOLLS ROAD, LEVEL 1 RM 747
STONY BROOK, NY 11794
Suffolk County (631) 444-7757
MRS. JANINE ELIZABETH ROMEO RPA-C
Physician Assistant
STONY BROOK UNIVERSITY HOSPITAL, 1 EDMUND PELLIGRINO DRIVE
STONY BROOK, NY 11794
Suffolk County (631) 444-1444

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 Agnieszka Kowalska's NPI number?

The NPI number for Agnieszka Kowalska is 1538320189. It was assigned to this individual provider in the NPPES registry on June 17, 2008.

Where is Agnieszka Kowalska located?

Agnieszka Kowalska practices at Stony Brook University Hospital Dept Of Neurology Hsc T12 020, Stony Brook, NY 11794. The listed phone number is (631) 444-2599.

What is Agnieszka Kowalska's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.

Is Agnieszka Kowalska enrolled in Medicare?

Yes. Agnieszka Kowalska 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.

Which organization bills Medicare for Agnieszka Kowalska's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Agnieszka Kowalska reassigns Medicare benefits to Neurology Associates Of Stony Brook, University Faculty Practice Corpo (Stony Brook, NY). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Agnieszka Kowalska's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Agnieszka Kowalska affiliated with any hospitals?

According to CMS data, Agnieszka Kowalska is affiliated with Suny/Stony Brook University Hospital.

When was this NPI record last updated?

The NPPES record for Agnieszka Kowalska was last updated on October 18, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 years 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.