CHARLES SOONKYU AHN MD
NPI 1942260278
Ophthalmology in Naperville, IL

Q: What is Charles Ahn's NPI number?

The NPI number for Charles Ahn is 1942260278. It was assigned to this individual provider in the NPPES registry on March 23, 2006.

Q: What is Charles Ahn's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Q: When was this NPI record last updated?

The NPPES record for Charles Ahn was last updated on August 3, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 23, 2006PECOS EnrolledAccepts Medicare Assignment

808 RICKERT DR STE 201, NAPERVILLE, IL 60540(630) 355-8000 Get Directions Write a Review

NPPES record last updated: August 3, 2023. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Feb 8, 2021, Nov 30, 2018 (2 updates tracked since 2018).

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About Charles Soonkyu Ahn Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

CHARLES SOONKYU AHN MD (NPI 1942260278) is an individual ophthalmology provider in Naperville, Illinois, licensed in Illinois (36098124) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with Edward Hospital, and is a graduate of University Of Michigan Medical School (1993).

NPPES Registry Identity

NPI1942260278

Entity TypeIndividualMale

Primary Taxonomy207W00000X

Provider Legal NameCHARLES SOONKYU AHNCredential: MD

Location Address808 RICKERT DR STE 201Naperville, IL 60540-0910

Mailing AddressPo Box 713260Chicago, IL 60677-1260 · (630) 469-9200

Phone(630) 355-8000

Sole ProprietorNo

Medical School CMSUniversity Of Michigan Medical SchoolGraduated 1993

Enumeration DateMarch 23, 2006

Last NPPES UpdateAugust 3, 20232 updates tracked since enumeration

NPPES CertifiedAugust 3, 2023

✔ NPI 1942260278 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians

Taxonomy Code207W00000X

License✔ Licensed in IL · 36098124

Definition

An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.

808 RICKERT DR STE 201, Naperville, IL 60540

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Other Identifiers 2

Medicaid036098124IL

OtherP00447354IL · Railroad Medicare

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Charles Soonkyu Ahn Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4981616703

PECOS Enrollment IDI20060619000144

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Charles Ahn reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Dupage Medical Group Ltd

10 mi

Multi-Specialty

1100 W 31ST ST, STE 300
Downers Grove, IL 60515

Reassigned Medicare billing, Illinois enrollment
1,061 clinicians in this Medicare group

NPI 1801833983 (630) 469-9200

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 12

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient complete exam of visual system 92014

An established patient complete exam of the visual system involves a thorough check of your eyes and vision. It assesses eye health, checks for diseases, and measures your ability to see clearly at different distances. It's a routine, non-invasive procedure.

487 services473 patients

Removal of cataract with insertion of prosthetic lens 66984

This is a procedure where a cloudy lens in your eye, known as a cataract, is removed. After removal, a clear artificial lens is inserted. This helps to restore your vision, enabling you to see clearly again.

287 services177 patients

Measurement of corneal curvature and depth of eye 92136

This procedure measures the shape and depth of your eye, specifically the cornea, the clear front surface. It helps in diagnosing conditions, planning for surgeries, or fitting contact lenses. It's non-invasive and painless.

271 services202 patients

Established patient problem focused exam of visual system 92012

This is a routine check-up for existing patients focusing on the visual system. It involves examining your eyes to detect any potential issues or changes in your vision. It's a crucial part of maintaining good eye health.

178 services106 patients

New patient complete exam of visual system 92004

A new patient complete exam of the visual system is a thorough evaluation of your eyes and vision. It checks for any potential issues and assesses overall eye health. It includes tests for visual acuity, eye movement, and light response.

136 services136 patients

Removal of recurring cataract in lens capsule using a laser 66821

This procedure, known as YAG laser capsulotomy, treats cloudiness in the lens capsule following cataract surgery. A laser is used to create a small hole in the cloudy capsule, allowing light to pass through and restore clear vision. It's a quick, painless procedure.

122 services97 patients

Ct scan of cornea 92025

A CT scan of the cornea is a non-invasive imaging test that uses X-rays to capture detailed pictures of your eye's cornea. It helps in diagnosing diseases or damage, planning for surgery, or evaluating the results of a treatment. It's a safe and painless procedure.

19 services12 patients

Imaging of front third of eye using a special microscope 92286

This procedure involves capturing detailed images of the front part of your eye using a specialized microscope. It helps in identifying any eye abnormalities or issues, improving the accuracy of diagnosis and treatment planning.

18 services17 patients

Creation of eye fluid drainage tracts in iris using a laser, per session 66761

This procedure uses a laser to create small drainage tracts in the iris, the colored part of your eye. This helps excess fluid escape, reducing pressure in the eye that can cause glaucoma. It's performed in sessions.

16 services16 patients

Transplantation of outer layer of corneal tissue 65756

The transplantation of the outer layer of corneal tissue is a procedure to replace damaged or diseased corneal tissue with healthy tissue from a donor. This can improve vision and alleviate pain or discomfort.

15 services14 patients

Imaging of retina 92134

Imaging of the retina is a non-invasive procedure that captures detailed images of your eye's interior. This helps detect conditions like macular degeneration or retinal detachment. It's painless and takes only a few minutes.

14 services13 patients

New patient office or other outpatient visit with straightforward medical decision making, if using time, 15 minutes or more 99202

This service involves an initial visit to the doctor's office or other outpatient setting. It typically lasts between 15-29 minutes. The doctor will review your medical history, conduct a physical examination, and discuss your health concerns. It's a chance to establish your health baseline and address any immediate medical issues.

12 services12 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Edward Hospital

Acute Care Hospitals · Naperville, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140231

Location801 South WashingtonNaperville, IL 60540 · Du Page County

Emergency services Birthing friendly

Advocate Good Samaritan Hospital

Acute Care Hospitals · Downers Grove, IL

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140288

Location3815 Highland AvenueDowners Grove, IL 60515 · Du Page County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60540 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$137.43 typical visit price

range $59.81 – $181.38

Typical copayment $34.35 (range $14.95 – $45.34)

Most-billed visit code 99204

Established Patient

$74.38 typical visit price

range $19.15 – $147.12

Typical copayment $18.59 (range $4.78 – $36.78)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 6

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SABRIYA ANSARI O.D.

Optometrist