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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MS. MARY ANN WINOKUR PA-C
NPI 1174112296
Physician Assistant in Naperville, IL

Active since January 13, 2021PECOS EnrolledAccepts Medicare Assignment
1220 HOBSON RD STE 104, NAPERVILLE, IL 60540(630) 416-1950(630) 416-5610 Get Directions Write a Review

NPPES record last updated: August 11, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

Record update history: Aug 11, 2026, Jun 9, 2023, Nov 22, 2022 and 1 more (4 updates tracked since 2021).

About Ms. Mary Ann Winokur Pa-c NPPES

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

MS. MARY ANN WINOKUR PA-C (NPI 1174112296) is an individual physician assistant in Naperville, Illinois, licensed in Illinois (085007666) and active in the NPI registry since January 2021. She is enrolled in Medicare PECOS, is affiliated with Northwestern Medicine Central Dupage Hospital, and maintains a secondary practice location in Bloomingdale.

NPPES Registry Identity

NPI1174112296
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameMS. MARY ANN WINOKURCredential: PA-C
Location Address1220 HOBSON RD STE 104Naperville, IL 60540-8137
Mailing Address2650 Ridge Ave Ste 1223Evanston, IL 60201-1700 · (847) 570-2040 · Fax (847) 733-5315
Phone(630) 416-1950
Fax(630) 416-5610
Sole ProprietorNo
Medical School CMSOtherGraduated 2019
Enumeration DateJanuary 13, 2021
Last NPPES UpdateAugust 11, 20264 updates tracked since enumeration
NPPES CertifiedAugust 11, 2026
✔ NPI 1174112296 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
License✔ Licensed in IL · 085007666
Definition
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Also ListedPhysician Assistant · MedicalTaxonomy 363AM0700X
1220 HOBSON RD STE 104, Naperville, IL 60540
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Other Names 1

Former Name (1)Ms. Mary Torres Pa-c

Secondary Practice Location 1

Location 1245 S Gary AveBloomingdale, IL 60108-2228 · Phone (630) 893-5230

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

Ms. Mary Ann Winokur Pa-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 ID7618383282
PECOS Enrollment IDI20210304002779
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.

Hospital Affiliations CMS Care Compare

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

Northwestern Medicine Central Dupage Hospital

Acute Care Hospitals · Winfield, IL
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140242
Location25 North Winfield RoadWinfield, IL 60190 · Du Page County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60540 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
$93.02 typical visit price
range $59.81 – $181.38
Typical copayment $23.25 (range $14.95 – $45.34)
Most-billed visit code 99203
Established Patient
$74.38 typical visit price
range $19.15 – $147.12
Typical copayment $18.59 (range $4.78 – $36.78)
Most-billed visit code 99213
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 2

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

DR. DAWEN ZHANG M.D.
Internal Medicine (Rheumatology)
1220 HOBSON RD STE 104
NAPERVILLE, IL 60540
Dupage County (630) 961-2810
VEVOSULU RACHEL KEYHO LSW
Social Worker
1220 HOBSON RD STE 104
NAPERVILLE, IL 60540
Dupage County (630) 646-7083

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 Winokur's NPI number?

The NPI number for Mary Winokur is 1174112296. It was assigned to this individual provider in the NPPES registry on January 13, 2021. The provider is also known as Ms. Mary Torres Pa-C.

Where is Mary Winokur located?

Mary Winokur practices at 1220 Hobson Rd Ste 104, Naperville, IL 60540. The listed phone number is (630) 416-1950.

What is Mary Winokur's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Is Mary Winokur enrolled in Medicare?

Yes. Mary Winokur 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 Winokur affiliated with any hospitals?

According to CMS data, Mary Winokur is affiliated with Northwestern Medicine Central Dupage Hospital.

When was this NPI record last updated?

The NPPES record for Mary Winokur was last updated on August 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 days 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.