Active NPI 1407809056 Individual Practitioner Female Practitioner

Dr. Mary Ahn , MD

Surgery • Winfield, IL

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Mary Ahn, MD is a certified Surgery practicing in Winfield, IL. With approximately 31 years of clinical experience since graduating from Loyola University Of Chicago, Stritch School Of Medicine in 1995, Dr. Ahn delivers high-quality medical care to the local community at 25 N WINFIELD RD STE 2202.

Dr. Ahn maintains professional affiliations with Central Dupage Physician Group, Northwestern Medical Faculty Foundation and accepts Medicare assignment.

Frequently performed procedures and clinical services include established patient outpatient office visit, new patient outpatient office visit, partial removal of breast. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

25 N Winfield Rd Ste 2202

Winfield, IL 601901379

Telephone 6303077799

Fax 6303072277

Associated Practice Facility / Clinic

🏢 West Suburban Surgical Associates, Ltd. Facility NPI 1184682478

Medicare Profile & Education

Medical School

Loyola University Of Chicago, Stritch School Of Medicine

Graduation Year

1995

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Surgery in Winfield, IL

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

31 Yrs -4.0 yrs vs City Avg

City Avg: 35.0 Yrs

State Avg: 27.3 Yrs

Regional Practice Density

4 Specialists

Practicing in Winfield, IL (1624 Statewide)

Telehealth Adoption Rate

0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

66.4% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Ahn (31 Years) 31 Yrs

Winfield Specialty Average (35.0 Years) 35.0 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	60	59	$123.00	$96.45
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	44	44	$384.00	$235.11
19301 Partial removal of breast	34	30	$1995.00	$718.46
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	33	31	$194.00	$129.71
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	33	32	$268.00	$191.17
G2212 Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or	24	22	$93.00	$34.39
38900 Lymph node imaging during surgery	23	23	$377.00	$151.50
38525 Biopsy or removal of lymph nodes of under the arm, open procedure	22	22	$1189.00	$245.54
19303 Total removal of breast	12	12	$4325.25	$1201.67

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	108	104	$123.00	$95.19
19301 Partial removal of breast	39	37	$2046.15	$717.65
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	38	38	$384.00	$227.72
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	35	32	$194.00	$132.50
38900 Lymph node imaging during surgery	25	25	$377.00	$146.09
38525 Biopsy or removal of lymph nodes of under the arm, open procedure	25	25	$1189.00	$236.66
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	25	24	$268.00	$188.85
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	12	12	$311.00	$176.37
G2212 Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or	12	12	$93.00	$33.70

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	70	70	$384.00	$237.44
19301 Partial removal of breast	60	58	$2094.75	$765.86
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	48	43	$268.00	$188.84
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	48	45	$194.00	$136.86
99213 Established patient office or other outpatient visit, typically 15 minutes	47	46	$123.00	$97.15
38900 Lymph node imaging during surgery	43	43	$385.77	$154.27
38525 Biopsy or removal of lymph nodes of under the arm, open procedure	39	39	$1219.49	$247.55
G2212 Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or	34	24	$93.00	$35.07
19303 Total removal of breast	20	20	$4566.15	$1279.02
19125 Removal of breast growth, open procedure	11	11	$1312.00	$450.59

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	97	88	$123.00	$98.18
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	59	56	$194.00	$139.27
19301 Partial removal of breast	49	42	$2076.43	$748.37
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	47	47	$384.00	$234.91
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	41	36	$268.00	$190.54
38900 Lymph node imaging during surgery	28	28	$377.00	$152.17
38525 Biopsy or removal of lymph nodes of under the arm, open procedure	25	25	$1189.00	$239.86
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	24	24	$311.00	$174.14
G2212 Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or	16	12	$93.00	$35.57

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	173	141	$194.00	$117.10
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	43	43	$312.74	$177.66
19301 Partial removal of breast	42	39	$1995.00	$757.23
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	39	31	$268.00	$156.90
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	33	33	$384.00	$224.39
38900 Lymph node imaging during surgery	33	33	$377.00	$161.10
38525 Biopsy or removal of lymph nodes of under the arm, open procedure	31	31	$1189.00	$251.97
19083 Biopsy of breast and placement of locating device using ultrasound, first growth	21	21	$2004.00	$658.37
99354 Prolonged office or other outpatient service first hour	16	15	$377.31	$139.38

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	195	158	$194.00	$114.54
G9678 Oncology care model (ocm) monthly enhanced oncology services (meos) payment for ocm enhanced services. g9678 payments may only be made to ocm practitioners for ocm beneficiaries for the furnishment of enhanced services as defined in the ocm participation a	170	35	$160.00	$156.80
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	45	45	$311.00	$175.52
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	29	29	$268.00	$154.81
19301 Partial removal of breast	22	20	$1995.00	$742.83
99213 Established patient office or other outpatient visit, typically 15 minutes	21	20	$123.00	$78.99
38900 Lymph node imaging during surgery	19	19	$416.68	$166.86
38525 Biopsy or removal of lymph nodes of under the arm, open procedure	19	19	$1314.16	$274.70
19083 Biopsy of breast and placement of locating device using ultrasound, first growth	19	19	$2109.47	$703.15

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	200	155	$194.00	$112.70
G9678 Oncology care model (ocm) monthly enhanced oncology services (meos) payment for ocm enhanced services. g9678 payments may only be made to ocm practitioners for ocm beneficiaries for the furnishment of enhanced services as defined in the ocm participation a	179	33	$160.00	$156.80
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	36	36	$311.00	$173.77
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	31	30	$268.00	$152.44
19301 Partial removal of breast	30	26	$1995.00	$727.16
99213 Established patient office or other outpatient visit, typically 15 minutes	25	20	$123.00	$76.78
19083 Biopsy of breast and placement of locating device using ultrasound, first growth	22	21	$2095.09	$729.57
38525 Biopsy or removal of lymph nodes of under the arm, open procedure	20	20	$1189.00	$244.24
99354 Prolonged office or other outpatient service first hour	16	16	$277.00	$136.91
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	14	14	$384.00	$218.95
38900 Lymph node imaging during surgery	13	13	$377.00	$155.64

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	172	130	$194.00	$111.20
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	42	42	$311.00	$173.23
19301 Partial removal of breast	34	31	$1995.00	$718.73
38525 Biopsy or removal of lymph nodes of under the arm, open procedure	30	29	$1189.00	$253.11
38900 Lymph node imaging during surgery	30	30	$377.00	$157.09
19285 Placement of locating device in breast using ultrasound guidance, first growth	26	26	$1368.00	$47.07
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	25	25	$384.00	$217.88
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	21	21	$268.00	$151.70
19083 Biopsy of breast and placement of locating device using ultrasound, first growth	14	14	$2004.00	$711.69
99213 Established patient office or other outpatient visit, typically 15 minutes	11	11	$123.00	$76.59
99354 Prolonged office or other outpatient service first hour	11	11	$277.00	$135.82

Medical Specialties & State Licenses

CMS Verified: 2025-11-13

Surgery Primary Specialty

NUCC Taxonomy Code: 208600000X

State License IL 036-096682

A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

036096682 (IL)

Commercial Insurance / Payer ID Medicare Ptan (Group)

206147 (IL)

Commercial Insurance / Payer ID Medicare Ptan (Individual)

206147228 (IL)

Hospital & Practice Group Affiliations

Northwestern Medical Faculty Foundation

25 N Winfield Rd, Winfield, IL 601901379

Phone: 6303525450

Central Dupage Physician Group

444 N Park Blvd, Glen Ellyn, IL 601374622

Phone: 6304690045

Secondary Practice Locations

304 Randall Rd

Geneva, IL 601344200

Phone: 6303077799

4405 Weaver Pkwy

Warrenville, IL 605553269

Phone: 6303077799

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

12 Associated Practitioners

Dr. Katherine Hansen , DO

Surgery - Surgical Oncology

NPI 1235360553

Doctor of Osteopathic Medicine (D.O.)

Jessica Mancuso , PA

Physician Assistant

NPI 1457864506

Physician Assistant

Spring Piatek , APRN, CNS

Nurse Practitioner

NPI 1508294547

Advanced Practice Registered Nurse, Clinical Nurse Specialist

Katherine Taylor , APRN

Nurse Practitioner

NPI 1568116374

Advanced Practice Registered Nurse

Dr. Batul Al-Zubeidy , MD

Surgery

NPI 1568725711

Doctor of Medicine (M.D.)

Dr. Utku Dolen , MD

Plastic Surgery

NPI 1609396464

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

13 Historical Events

📍

Updated Practice Location November 13, 2025

Registered at 25 N WINFIELD RD STE 2202, WINFIELD, IL 601901379 (Tel: 6303077799)

📍

Updated Business Mailing Address November 13, 2025

Registered at 25 N WINFIELD RD STE 2202, WINFIELD, IL 601901379 (Tel: 6303077799)

✅

NPI Profile Active January 03, 2018

NPI status registered as active in NPPES database

📍

Updated Practice Location January 03, 2018

Registered at 351 DELNOR DR, GENEVA, IL 601344220 (Tel: 6303077799)

📍

Updated Business Mailing Address January 03, 2018

Registered at 351 DELNOR DR, GENEVA, IL 601344220 (Tel: 6303077799)

👤

Provider Name / Credentials Updated January 03, 2018

Recorded as MARY AHN, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) January 03, 2018

Surgery (License #036-096682 in IL)

✅

NPI Profile Active December 13, 2013

NPI status registered as active in NPPES database

📍

Updated Practice Location December 13, 2013

Registered at 473 W ARMY TRAIL RD, BLOOMINGDALE, IL 601082674 (Tel: 6303077799)

📍

Updated Business Mailing Address December 13, 2013

Registered at 473 W ARMY TRAIL RD, BLOOMINGDALE, IL 601082674 (Tel: 6303077799)

👤

Provider Name / Credentials Updated December 13, 2013

Recorded as MARY AHN, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) December 13, 2013

Surgery (License #036-096682 in IL)

🟢

Initial NPI Registration & Enumeration May 17, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1407809056

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: May 17, 2006

Last Update: November 13, 2025

Sole Proprietor: No

Update or Correct Profile

Mailing Address

25 N Winfield Rd Ste 2202

Winfield, IL 601901379

Phone: 6303077799

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.