Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mary Ahn, MD
Surgery Physician in Winfield, IL · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1407809056
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Registry record
Entity type Individual (Type 1)
Name Mary Ahn
Credential MD
Sex Female
Practice address 25 N Winfield Rd Ste 2202, Winfield, IL, 60190
Phone (630) 307-7799
Fax (630) 307-2277
Enumeration date May 17, 2006
Last updated in NPPES Nov 13, 2025
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 036096682 | Medicaid | IL | - |
| 206147 | Other | IL | MEDICARE PTAN (GROUP) |
| 206147228 | Other | IL | MEDICARE PTAN (INDIVIDUAL) |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
What specialty is Mary Ahn?
Mary Ahn is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all → Jessica Mancuso Physician Assistant · Winfield, IL NPI 1457864506 Klara Major Nurse Practitioner · Winfield, IL NPI 1093229858 Alison Mccall Physician Assistant · Winfield, IL NPI 1821581828 Katherine Taylor Nurse Practitioner · Winfield, IL NPI 1568116374 Lauren Sanchez Nurse Practitioner · Winfield, IL NPI 1134818875 Lauren Blade Physician Assistant · Winfield, IL NPI 1932908217
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-13.