Charles Ahn, MD
NPI 1942260278 · Ophthalmology Physician · Naperville, IL
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Ahn, MD is a Ophthalmology Physician provider in Naperville, IL (NPI 1942260278).
Provider details
- NPI number
- 1942260278
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 36098124 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,575 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Complete Exam of Visual System92014 | 487 | $128 |
| Removal of Cataract With Insertion of Prosthetic Lens66984 | 287 | $546 |
| Measurement of Corneal Curvature and Depth of Eye92136 | 271 | $42 |
| Established Patient Problem Focused Exam of Visual System92012 | 178 | $91 |
| New Patient Complete Exam of Visual System92004 | 136 | $151 |
| Removal of Recurring Cataract in Lens Capsule Using a Laser66821 | 122 | $337 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 18 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisolone Acetate | 1,109 | 563 |
| Ofloxacin | 732 | 493 |
| Latanoprost | 124 | 33 |
| Ketorolac Tromethamine | 79 | 52 |
| Timolol Maleate | 35 | 12 |
| Tobramycin | 34 | 17 |
| Polymyxin B Sulf/Trimethoprimbrand: Polymyxin B Sul-Trimethoprim | 28 | 19 |
| Cyclosporinebrand: Restasis |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$42 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-23
- Last updated
- 2023-08-03
- Certified
- 2023-08-03
Frequently asked questions
- What is Charles Ahn's NPI number?
- Charles Ahn's National Provider Identifier (NPI) is 1942260278, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Ahn's specialty?
- Charles Ahn is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Ahn located?
- Charles Ahn's practice location on file with NPPES is 808 Rickert Dr Ste 201, Naperville, IL 60540-0910.
- What is Charles Ahn's phone number?
- The practice phone number listed in the NPPES registry for Charles Ahn is (630) 355-8000.
- Does Charles Ahn accept Medicare?
- Charles Ahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Ahn's NPI active?
- Yes — Charles Ahn's NPI (1942260278) is active in the NPPES registry as of the last update on 2023-08-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.