Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Nicholas Cho Ahn, MD

Individual provider Internal Medicine Physician · NPI 1376983346

Nicholas Cho Ahn, MD practises Internal Medicine in Springfield, Illinois. Graduated from Michigan State University College of Human Medicine in 2013, 13 years ago. Practices with Wayne Memorial Community Health Centers, a 45-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois and Michigan.

Years since qualifying
13
Trained at
Michigan State University College of Human Medicine
Licensed in
IL, MI
In the registry since
2013
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

751 N Rutledge St Ste 1100
Springfield, IL 62702
Phone: (217) 545-8000
Fax: (217) 545-4735
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 5629 Stadium Dr Ste B, Kalamazoo, MI 49009-1952 — (269) 544-3270

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 036-141124 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 4301114315 (MI)
Psychiatry Physician Taxonomy 2084P0800X · Licence 125.064175 (IL)

Record details

NPI number1376983346
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 5, 2013
Last updated in NPPESJune 5, 2018

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolMICHIGAN STATE UNIVERSITY COLLEGE OF HUMAN MEDICINE
Graduated 2013 (13 years in practice)
Group practice Wayne Memorial Community Health Centers — 45 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients274
Services billed 1,023 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $215 10 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Wayne Memorial Community Health Centers

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 45 clinicians in the practice; 12 are shown here.

Other providers in Springfield