Mary Ahn, MD

Primary specialty

Surgery PhysicianTaxonomy code 208600000X

License

036-096682 Issued in IL

Practice address

25 N Winfield Rd Ste 2202
Winfield, IL 60190-1379

Phone

(630) 307-7799

Fax

(630) 307-2277

NPI assigned

May 17, 2006

Last updated

Nov 13, 2025By the provider in NPPES

Sex

Female

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Other identifiers 3

Medicare fee-for-service enrollment

Enrolled in IL

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

General Surgery

Education

Loyola University of Chicago, Stritch School of Medicine, 1995

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Northwestern Medical Faculty FoundationGroup PAC ID 4587576814, 4,386 clinicians

Central Dupage Physician GroupGroup PAC ID 5890696231, 1,087 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Northwestern Medicine Central Dupage Hospital Hospital, Winfield, IL, CCN 140242
• Northwestern Medicine Delnor Community Hospital Hospital, Geneva, IL, CCN 140211
• Northwestern Medicine McHenry Hospital, McHenry, IL, CCN 140116
• Northwestern Memorial Hospital Hospital, Chicago, IL, CCN 140281

Merit-based Incentive Payment System (MIPS)

Final score

95.63 of 100Reported as apm

Quality

88.47

Promoting interoperability

100

Improvement activities

40

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Central Dupage Physician Group

  dba Northwestern Medicine Regional Medical Group

  • Family Medicine Physician
  • Carol Stream, IL
  • NPI 1033149844
  Medicare reassignment Care Compare group NPD
• Northwestern Medical Faculty Foundation

  dba Northwestern Medical Group

  • Multi-Specialty Clinic/Center
  • Carol Stream, IL
  • NPI 1346235314
  Medicare reassignment Care Compare group NPD
• Central Dupage Physician Group

  dba Northwestern Medicine Regional Medical Group

  • Orthopaedic Surgery Physician
  • Geneva, IL
  • NPI 1780012344
  NPD
• Northwestern Medical Faculty Foundation

  dba Northwestern Medical Group

  • Durable Medical Equipment & Medical Supplies
  • Chicago, IL
  • NPI 1417718479
  NPD
• West Suburban Surgical Associates, LTD.

  dba advanced breast care specialists

  • Surgery Physician
  • Bloomingdale, IL
  • NPI 1184682478
  NPD (past)
• Mercy Hospital

  dba Northern Light Mercy Health Center

  • Rural Health Clinic/Center
  • Windham, ME
  • NPI 1396496378
  NPD (past)
• Mercy Hospital

  dba Mercy Medical Associates

  • General Acute Care Hospital
  • Portland, ME
  • NPI 1427313048
  NPD (past)
• Mercy Hospital

  • General Acute Care Hospital
  • Portland, ME
  • NPI 1629078712
  NPD (past)
• Mercy Hospital

  dba Mercy Express Care Westbrook

  • General Acute Care Hospital
  • Westbrook, ME
  • NPI 1801234182
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Central Dupage Hospital Association

  dba Northwestern Medicine Central Dupage Hospital

  • General Acute Care Hospital
  • Winfield, IL
  • NPI 1003864810
  Care Compare affiliation
• Central Dupage Hospital Association

  dba Northwestern Medicine Central Dupage Hospital

  • Psychiatric Hospital Unit
  • Winfield, IL
  • NPI 1740230895
  Care Compare affiliation
• Delnor Community Hospital

  dba Northwestern Medicine Delnor Community Hospital

  • General Acute Care Hospital
  • Geneva, IL
  • NPI 1407859655
  Care Compare affiliation
• Northern Illinois Medical Center

  dba Centegra Hospital McHenry

  • General Acute Care Hospital
  • McHenry, IL
  • NPI 1982611281
  Care Compare affiliation
• Northwestern Memorial Hospital

  • General Acute Care Hospital
  • Chicago, IL
  • NPI 1497859649
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1147824000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1762992000000",
    "number": "1407809056",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "25 N WINFIELD RD STE 2202",
            "city": "WINFIELD",
            "state": "IL",
            "postal_code": "601901379",
            "telephone_number": "630-307-7799",
            "fax_number": "630-307-2277"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "25 N WINFIELD RD STE 2202",
            "city": "WINFIELD",
            "state": "IL",
            "postal_code": "601901379",
            "telephone_number": "630-307-7799",
            "fax_number": "630-307-2277"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "304 Randall Rd",
            "address_purpose": "LOCATION",
            "city": "Geneva",
            "state": "IL",
            "postal_code": "601344200",
            "country_code": "US",
            "telephone_number": "630-307-7799",
            "fax_number": "630-307-2277",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "4405 Weaver Pkwy",
            "address_purpose": "LOCATION",
            "city": "Warrenville",
            "state": "IL",
            "postal_code": "605553269",
            "country_code": "US",
            "telephone_number": "630-307-7799",
            "fax_number": "630-307-2277",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "AHN",
        "first_name": "MARY",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-05-17",
        "last_updated": "2025-11-13",
        "certification_date": "2025-11-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208600000X",
            "taxonomy_group": "",
            "desc": "Surgery",
            "state": "IL",
            "license": "036-096682",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "036096682",
            "state": "IL"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MEDICARE PTAN (INDIVIDUAL)",
            "identifier": "206147228",
            "state": "IL"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MEDICARE PTAN (GROUP)",
            "identifier": "206147",
            "state": "IL"
        }
    ],
    "endpoints": [],
    "other_names": []
}

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• Surgery Physician in Winfield, IL
• Providers in Winfield, IL by specialty
• Surgery Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 13, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.