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Won H Oh , PA-C

Physician Assistant β€’ Chicago, IL

Active NPI 1053899138 Individual Practitioner Female Practitioner Accepts Medicare assignment Telehealth (some services)
Practice location in NPPES

259 E Erie St Ste 300
Chicago, IL 606112988

Call 3129264566 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

259 E Erie St Ste 300

Chicago, IL 606112988

Telephone 3129264566
Fax 3129266511
Other Listings in Public Data

CMS Doctors and Clinicians lists 2 distinct group names: Northwestern Medical Faculty Foundation; University Of Chicago. See the list

Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.

Listings do not confirm current availability, employment or a shared ownership network.

Medicare Profile & Education

Source: CMS Doctors and Clinicians National Downloadable File

Graduation Year

2018

30-day fills

117 standardized 30-day fills in 2024

CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.

What this does not show: 30-day fills

It is not a count of patients and not a measure of quality.

Part D drug cost

$380 in 2024

The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.

What this does not show: Part D drug cost

A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.

Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.

Open Payments general payments, program year 2025

All general payments: $664.71 across 8 records.

By nature of payment

  • Food and Beverage: $664.71 across 8 records.

Reporting-company totals

  • Edwards Lifesciences Corporation: $529.17 across 6 records.
  • Boehringer Ingelheim Pharmaceuticals, Inc.: $117.53 across 1 record.
  • Pfizer Inc.: $18.01 across 1 record.

A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.

See the full table

Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).

Guide: How to read an Open Payments record

Years since graduation

8 years (graduated 2018)

CMS Doctors and Clinicians data list 2018 as the year this clinician finished professional school.

What this does not show: Years since graduation

It is not the number of years in practice, and more years does not mean better care.

Source: CMS Doctors and Clinicians National Downloadable File.

NPI first issued

2018

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Accepts Medicare assignment

CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians; Medicare.gov, β€œDoes your provider accept Medicare as full payment?”

Guide: What Medicare assignment means

Telehealth (some services)

Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.

What this does not show: Telehealth (some services)

It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.

Guide: How Medicare covers telehealth

Enrolled in Medicare (PECOS)

Won Oh has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.

It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What Medicare enrollment (PECOS) means

Can order Medicare-covered services

CMS lists Won Oh as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.

What this does not show: Can order Medicare-covered services

It does not mean the clinician offers these services directly.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What ordering and referring status means

Compared with the same specialty in Chicago and Illinois

Billing and prescribing volume is not a quality rating.

Medicare Part D prescriptions

Close to the middle for clinicians listed under Physician Assistant in Chicago, IL (2024, 651 clinicians with data). Median for this group: 116. Middle half: 41 to 337.

Fewer Part D prescriptions than 65% of clinicians listed under Physician Assistant in Illinois (2024, 2,668 clinicians with data). Median for this group: 203. Middle half: 67 to 595.

Part D drug cost

A lower Part D drug cost than 70% of clinicians listed under Physician Assistant in Chicago, IL (2024, 651 clinicians with data). Median for this group: $1,977. Middle half: $320 to $34,048.

A lower Part D drug cost than 80% of clinicians listed under Physician Assistant in Illinois (2024, 2,668 clinicians with data). Median for this group: $3,018. Middle half: $535 to $48,132.

1,446 active clinicians are listed under Physician Assistant with a practice address in Chicago, IL (4,929 in Illinois).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in Chicago

17.4% of these 1,446 clinicians have the CMS telehealth indicator.

63.6% of these 1,446 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo Β· Report an error.

Pharma & Medical Device Financial Disclosures

Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments

Open Payments Β· Program Year 2025
Disclosure Year:

Program year 2025 (payments made January 1 – December 31, 2025): fewer than 11 records totaling $664.71.

Manufacturer Payment Nature Product Type Amount ($)
Edwards Lifesciences Corporation
Food and Beverage
In-kind items and services
β€” General $171.67
Edwards Lifesciences Corporation
Food and Beverage
In-kind items and services
MITRIS RESILIA Mitral Valve General $154.05
Boehringer Ingelheim Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
JARDIANCE General $117.53
Edwards Lifesciences Corporation
Food and Beverage
In-kind items and services
MITRIS RESILIA Mitral Valve General $63.44
Edwards Lifesciences Corporation
Food and Beverage
In-kind items and services
MITRIS RESILIA Mitral Valve General $63.44
Edwards Lifesciences Corporation
Food and Beverage
In-kind items and services
β€” General $56.36
Edwards Lifesciences Corporation
Food and Beverage
In-kind items and services
MITRIS RESILIA Mitral Valve General $20.21
Pfizer Inc.
Food and Beverage
In-kind items and services
VYNDAQEL General $18.01

Source: CMS Open Payments, program year 2025, released June 30, 2026.

Medicare Part D Prescribing Profile & Medications

Medicare Part D prescriptions filled, including refills, in 2024.

CMS Part D Β· Data Year 2024
Prescription Year:
Brand Name Generic Name Prescriptions Day Supply Total Cost Patients
Methylprednisolone Methylprednisolone 26 112 $110.75 25
Tramadol Hcl Tramadol Hcl 25 70 $28.77 24
Metoprolol Tartrate Metoprolol Tartrate 23 870 $85.41 17
Clopidogrel Clopidogrel Bisulfate 15 540 $94.94 β€”
Spironolactone Spironolactone 11 556 $60.37 β€”

Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits

Specialties & License Numbers Reported to NPPES

Self-certified to NPPES: 2026-02-27
Physician Assistant Primary Specialty

NUCC Taxonomy Code: 363A00000X

License # reported to NPPES IL 085006591

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.

Physician Assistant - Surgical

NUCC Taxonomy Code: 363AS0400X

License # reported to NPPES IL 085006591
Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Illinois Department of Financial and Professional Regulation.
Look Up on State Board Site

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - PHYSICIAN ASSISTANT

Medicare Enrollment ID

I20181016000983

Enrollment State Jurisdiction

IL

PECOS Control ID

7719239920

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.

Medicare Group Practice Enrollments

Source: CMS Doctors and Clinicians National Downloadable File

Northwestern Medical Faculty Foundation

675 N St Clair, Chicago, IL 606115975

University Of Chicago

5841 S Maryland Ave, Chicago, IL 606371443

Phone: 8888240200

Northwestern Medical Faculty Foundation

259 E Erie St, Chicago, IL 606112930

Phone: 3125031944

Northwestern Medical Faculty Foundation

635 N Dearborn St, Chicago, IL 606544618

Phone: 3129260404

University Of Chicago

355 E Grand Ave, Chicago, IL 606115389

Phone: 8888240200

Northwestern Medical Faculty Foundation

675 N Saint Clair St, Chicago, IL 606115975

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

5 listed
Ijeoma Achebe , FNP

Nurse Practitioner

NPI 1013498294

Family Nurse Practitioner

Alayna Anerino , APRN, CNP

Nurse Practitioner

NPI 1760835714

Advanced Practice Registered Nurse, Certified Nurse Practitioner

Allyson Fritts , PA-C

Physician Assistant

NPI 1366976300

Physician Assistant (Certified)

Jillian Maruna

Nurse Practitioner

NPI 1306274535
Sarah Smyth , APRN, CNP

Nurse Practitioner

NPI 1750794137

Advanced Practice Registered Nurse, Certified Nurse Practitioner

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

14 Historical Events
πŸ“
Updated Practice Location February 27, 2026

Registered at 259 E ERIE ST STE 300, CHICAGO, IL 606112988 (Tel: 3129264566)

πŸ“
Updated Business Mailing Address February 27, 2026

Registered at 259 E ERIE ST STE 300, CHICAGO, IL 606112988 (Tel: 3129264566)

πŸ‘€
Provider Name / Credentials Updated February 27, 2026

Recorded as WON OH, PA-C

πŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) February 27, 2026

Physician Assistant (license number reported to NPPES: IL 085006591)

πŸ“
Updated Practice Location March 08, 2022

Registered at 5841 S MARYLAND AVE, CHICAGO, IL 606371443 (Tel: 8888240200)

πŸ“
Updated Business Mailing Address March 08, 2022

Registered at 150 HARVESTER DR, SUITE 300, BURR RIDGE, IL 605275919

πŸ“
Updated Business Mailing Address May 28, 2019

Registered at 150 HARVESTER DR STE 300, BURR RIDGE, IL 605275965 (Tel: 7737021061)

πŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) May 28, 2019

Physician Assistant (license number reported to NPPES: IL 085006591)

βœ…
NPI Profile Active August 01, 2018

NPI status registered as active in NPPES database

πŸ“
Practice Location (Initial Record) August 01, 2018

Registered at 5841 S. MARYLAND AVE., MC5040, CHICAGO, IL 60637 (Tel: 7737021000)

πŸ“
Business Mailing Address (Initial Record) August 01, 2018

Registered at 102 MOBBLY BAY DR, OLDSMAR, FL 346774014 (Tel: 8138923220)

πŸ‘€
Provider Name / Credentials (Initial Record) August 01, 2018

Recorded as WON OH

πŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) August 01, 2018

Physician Assistant

🟒
Initial NPI Registration & Enumeration August 01, 2018

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1053899138
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: August 01, 2018
Last Update: February 27, 2026
Sole Proprietor: No

Other Physician Assistants in Chicago

All Physician Assistants in Chicago

More public profiles in Illinois

Directory navigation, in NPI number order.

Mailing Address

259 E Erie St Ste 300

Chicago, IL 606112988

Phone: 3129264566

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.