Dr. Mary Ahn, MD
- Medicare services, 2024
- 285
- Medicare patients, 2026
- 147
- Part D claims, 2026
- 78
- MIPS score, 2026
- 96
- Hospital affiliations
- 4
- Practice address
- 25 North Winfield Road, Winfield, IL 60190
- Practice phone
- Call (630) 682-1600
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Ahn's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mary Ahn is a general surgeon in Winfield, Illinois
Dr. Ahn practices at Northwestern Medicine Central DuPage Hospital in Winfield, Illinois, part of Northwestern Memorial HealthCare.
Dr. Ahn's NPI, 1407809056, was assigned on May 17, 2006. Dr. Ahn graduated from Loyola University of Chicago, Stritch School of Medicine in 1995. Dr. Ahn holds Illinois license 036-096682.
- NPI
- 1407809056NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2961472246
- NPI enumeration date
- May 17, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (630) 682-1600
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mary Ahn practices at Northwestern Medicine Central DuPage Hospital in Winfield, Illinois
Dr. Ahn's primary practice is Northwestern Medicine Central DuPage Hospital, at 25 North Winfield Road, Winfield, IL 60190 in Du Page County. The practice phone is (630) 682-1600.
- Northwestern Medicine Central DuPage Hospital25 North Winfield Road, Winfield, IL 60190 · Du Page CountyPhone(630) 682-1600
Source: Dmand AI Affiliation Data
Dr. Mary Ahn is affiliated with 6 sites of care and 2 medical groups
Dr. Ahn's primary practice is Northwestern Medicine Central DuPage Hospital in Winfield, Illinois, part of Northwestern Memorial HealthCare. Dr. Ahn is also affiliated with Northwestern Memorial Hospital. The medical group on file is Northwestern Medical Faculty Foundation. Dmand AI also links Dr. Ahn to 2 more hospitals, 1 breast imaging center, 1 clinical lab and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mary Ahn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ahn practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northwestern Medicine Central DuPage Hospital | Available with a free account |
| +5 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Northwestern Memorial HealthCare and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mary Ahn is one of 1,217 general surgeons in Illinois
Surgery is Dr. Ahn's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Ahn is licensed in Illinois.
Specialties and state licenses
- Surgery, IllinoisPrimary
General surgeons near Dr. Ahn
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mary Ahn billed Medicare for 285 services in 2024
CMS data shows 285 Medicare services from Dr. Ahn across 9 procedure codes in 2024, for 147 Medicare patients. Medicare paid $59,066 for them.
Dr. Ahn's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2182024: 17022%
- Surgery
- 2023: 892024: 912%
- Other services
- 2023: 122024: 24100%
Where Dr. Ahn's Medicare services took place, 2024
- In an office19468%
- In a facility9132%
Dr. Ahn compared with the Illinois median for general surgeons, 2024
- Dr. Ahn
- Illinois median
- Medicare services
- 285vs 19447% above
- Medicare patients
- 147vs 144Close to median
- Part D claims
- 73vs 282.6 times
Medians across 1,031 general surgeons in Illinois with Dmand AI profiles that report each measure.
Dr. Ahn's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ahn and other general surgeons in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mary Ahn treated 147 Medicare patients in 2026, average age 74
CMS counts 147 Medicare patients who saw Dr. Ahn in 2026. The largest group is 65 to 74, with 79 patients. 75% of them have cancer, and 71% have high cholesterol. 9% are also on Medicaid. Their average risk score is 0.98, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ahn's median patient age at 69, with 100% women.
Dr. Ahn's Medicare patients by age, 2026
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Ahn's Medicare patients, 2026
- Cancer75%
- High cholesterol71%
- High blood pressure63%
- Arthritis43%
- Mood disorders27%
- Anxiety24%
- Depression24%
- Diabetes23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ahn's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women100%
- Men0%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2026 data
Dr. Mary Ahn wrote 78 Medicare Part D claims in 2026
In 2026, Dr. Ahn wrote 78 Medicare Part D claims for 40 patients. 100% of them were for generic drugs. CMS names the drug for 73 of them, across 3 drugs with 11 or more claims each, at $292 in total drug cost. In 2023, CMS named 41 claims across 3 drugs.
Dr. Ahn's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Ahn's Part D claims, 2026
- Opioids29%23 of 78 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 412024: 7378%
Drugs named by CMS: 3 in 2024, 3 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2026 data
Dr. Mary Ahn scored 96 out of 100 in Medicare's MIPS program for 2026
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 96 out of 100 for Dr. Ahn for performance year 2026, reported through an alternative payment model (APM). Dr. Ahn accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 56 procedures of mastectomy by Dr. Ahn, more than 96% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Ahn's MIPS scores, performance year 2026
- 96of 100Final score
- 88.5of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Ahn ranks in Medicare procedure volume
- Mastectomy
- 96th percentile56 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Skin biopsy: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2026 data; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Mary Ahn received $2,177 in industry payments from 2016 to 2025
CMS Open Payments shows 17 general payments to Dr. Ahn from 9 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 51% of the total. AxoGen paid the most, $1,490.
General payments to Dr. Ahn by program year, 2016 to 2025
General payments to Dr. Ahn by kind, 2016 to 2025
- Food and beverage$1,11351%
- Travel and lodging$1,06549%
Companies that paid Dr. Ahn the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mary Ahn graduated from Loyola University of Chicago, Stritch School of Medicine
Dr. Ahn graduated from Loyola University of Chicago, Stritch School of Medicine in 1995.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mary Ahn's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mary Ahn
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mary Ahn's NPI number?
Dr. Mary Ahn's NPI number is 1407809056. It was assigned on May 17, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mary Ahn?
Dr. Mary Ahn is a general surgeon in Winfield, Illinois. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Mary Ahn practice?
Dr. Ahn practices at 25 North Winfield Road, Winfield, IL 60190. Dr. Ahn's primary practice is Northwestern Medicine Central DuPage Hospital in Winfield, Illinois, part of Northwestern Memorial HealthCare. Dmand AI also links Dr. Ahn to 2 hospitals, 1 breast imaging center, 1 clinical lab and 1 medical group, and a free account names each one.
What is Dr. Mary Ahn's office phone number?
The practice phone on file for Dr. Ahn is (630) 682-1600. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Dr. Mary Ahn's email address?
Dmand AI checks professional and personal email addresses for Dr. Ahn through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Dr. Mary Ahn's medical license number?
Dr. Ahn holds Illinois license 036-096682.
Which hospitals is Dr. Mary Ahn affiliated with?
Dr. Ahn practices at Northwestern Medicine Central DuPage Hospital in Winfield, Illinois. Dr. Ahn is also affiliated with Northwestern Memorial Hospital. Dmand AI links Dr. Ahn to 2 more hospitals, named with a free account.
What medical group is Dr. Mary Ahn part of?
Dr. Ahn is linked to Northwestern Medical Faculty Foundation. Dmand AI links Dr. Ahn to 1 more medical group, named with a free account.
Who does Dr. Mary Ahn practice with?
Dmand AI links 4,902 HCPs to Dr. Ahn's primary medical group, 32 of them general surgeons. A free account lists them, with verified contacts.
Does Dr. Mary Ahn accept Medicare?
Yes. CMS data shows Dr. Ahn billed Medicare for 285 services in 2024, and Dr. Ahn accepts Medicare assignment.
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What is Dr. Mary Ahn's MIPS score?
Dr. Ahn's MIPS final score for performance year 2026 is 96 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Mary Ahn see?
CMS counts 147 Medicare patients who saw Dr. Ahn in 2026, with an average age of 74.
What services does Dr. Mary Ahn bill to Medicare?
In 2024, Dr. Ahn's most billed Medicare services were office visit, established patient (99213), office visit, new patient (99205) and surgery: skin and soft tissue (19301).
Where did Dr. Mary Ahn go to medical school?
Dr. Ahn graduated from Loyola University of Chicago, Stritch School of Medicine in 1995.
What drugs does Dr. Mary Ahn prescribe most?
In 2024 Medicare Part D data, Dr. Ahn's most prescribed drugs by claims were Ibuprofen, Tramadol HCl and Gabapentin.
Has Dr. Mary Ahn received payments from drug or device companies?
CMS Open Payments shows $2,177 in general payments to Dr. Ahn from 9 companies from 2016 to 2025. The largest total came from AxoGen.
How long has Dr. Mary Ahn been practicing?
Dr. Ahn graduated from medical school in 1995, 31 years ago.
What EHR does Dr. Mary Ahn's practice use?
Dmand AI tracks the EHR system at Northwestern Medicine Central DuPage Hospital and at 5 more sites and 1 medical group. The vendor and product are available with a free Dmand AI account.
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