Mary Ahn, MD
Surgery Physician · Winfield, IL
Mary Ahn, MD is a surgery physician with a practice address in Winfield, Illinois, and NPI 1407809056, issued on May 17, 2006. Check the license (Illinois 036-096682, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mary Ahn
- Credential
- MD
- Primary taxonomy
- Surgery Physician 208600000X
- License number
- 036-096682 IL
Self-reported in NPPES; status is on the state search - Practice location
- 25 N Winfield RD Ste 2202, Winfield, IL 60190
- Phone
- (630) 307-7799
- Enumerated
- May 17, 2006
- Record last updated
- Nov 13, 2025
- Fax
- (630) 307-2277
- Medicaid ID
- 036096682 IL
- Medicare enrollment
- Enrolled (PECOS I20070416000581); accepts Medicare assignment
- Medical or professional school
- Loyola University Of Chicago, Stritch School Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 1,520 in Illinois → Look up another NPI →
Also registered at 25 N Winfield RD Ste 2202
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lauren Blade, PA-CPhysician Assistant1932908217
- Klara Major, APRN, CNPNurse Practitioner1093229858
- Jessica Mancuso, PAPhysician Assistant1457864506
- Alison McCall, PA-CPhysician Assistant1821581828
- Lauren Sanchez, APRN, CNPNurse Practitioner1134818875
- Katherine Taylor, APRNNurse Practitioner1568116374
Verify Mary Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036-096682Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
47% fewer Medicare Part D claims than the average surgery physician in 2024
78 Medicare Part D claims for 40 beneficiaries, against an average of 147 among the 20,115 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 23 claims were for opioids.
Most prescribed
- Ibuprofen33 claims
- Tramadol Hcl23 claims
- Gabapentin17 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.
The MIPS final score for 2023 (Medicare payment program): 94.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 2 group practices
- Central Dupage Physician GroupGlen Ellyn, IL
- Northwestern Medical Faculty FoundationWinfield, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Ahn among 1,520 surgery physician records in Illinois
Mary Ahn, MD is one of 1,520 surgery physician records with a practice address in Illinois. 66% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 64% newer
- In a Medicare fileYes · 66% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated1995 · median 2004 among the 650 with a school on file
- Record last updated2025 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery Physician providers in Illinois
There are 1,520 surgery physician records in Illinois.
All 1,520 in Illinois → Every provider in Winfield → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Batul Al-Zubeidy, MDWinfield, IL 601901568725711
- Sara Fredrickson, MDWinfield, IL 601901922066380
- David Woodard, MDWinfield, IL 601901447231782
- Anthony Altimari, MDWheaton, IL 601891235103581
- Yolanda Chang, MDWheaton, IL 601891356644876
- Jeffrey Fronza, MDWheaton, IL 601891265695258
- David Klem, MDWheaton, IL 601891487628475
- Summer Rochester, DOWheaton, IL 601891649659335
Common questions
What is Mary Ahn, MD's NPI number?
Mary Ahn, MD's National Provider Identifier (NPI) is 1407809056, issued on May 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Ahn, MD located?
The NPPES record lists a practice address at 25 N Winfield RD Ste 2202, Winfield, IL, 60190. Phone: (630) 307-7799. Providers update this record themselves, so call before visiting.
How can I verify Mary Ahn, MD's license?
NPPES lists Illinois license number 036-096682, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mary Ahn, MD prescribe under Medicare Part D?
In 2024, Mary Ahn, MD had 78 Medicare Part D claims for 40 beneficiaries; the average among surgery physician prescribers was 147. Part D covers Medicare prescriptions only.
What is Mary Ahn, MD's MIPS final score?
The 2023 MIPS final score is 94.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.