Nicholas Cho Ahn, M.D.
Internal Medicine Physician · Springfield, IL
Nicholas Cho Ahn, M.D. is an internal medicine physician with a practice address in Springfield, Illinois, and NPI 1376983346, issued on Jul 5, 2013. Check the license (Illinois 036-141124, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Nicholas Cho Ahn
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 036-141124 IL
125.064175 IL
4301114315 MI
Self-reported in NPPES; status is on the state search - Practice location
- 751 N Rutledge St, Springfield, IL 62702
- Phone
- (217) 545-8000
- Enumerated
- Jul 5, 2013
- Record last updated
- Jun 5, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (217) 545-4735
- Medicaid ID
- 036141124 IL
- Medicare enrollment
- Enrolled (PECOS I20230227003063); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Human Medicine, 2013
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 751 N Rutledge St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Nicholas Cho Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036-141124Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.0 times the Medicare Part D claims of the average internal medicine physician in 2024
6,369 Medicare Part D claims for 556 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 186 claims were for opioids.
Most prescribed
- Atorvastatin Calcium275 claims
- Levothyroxine Sodium213 claims
- Lisinopril197 claims
- Alprazolam185 claims
- Losartan Potassium153 claims
- Metoprolol Succinate145 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 90.3 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $2,227.61
122 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Wayne Memorial Community Health CentersLake Ariel, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nicholas Cho Ahn among 7,238 internal medicine physician records in Illinois
Nicholas Cho Ahn, M.D. is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 57% of them.
- NPI issued2013 · 57% of these records are older, 41% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2013 · median 2003 among the 3,580 with a school on file
- Record last updated2018 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
196 internal medicine physician records list a practice address in Springfield
They are 196 of the 4,997 NPPES records with a practice address in Springfield, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Springfield → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Lisa Benning, M.D.Springfield, IL 627021689672289
- Erik Constance, M.D.Springfield, IL 627021427033497
- Alan Deckard, M.D.Springfield, IL 627021104801190
- Nicole Florence, M.D.Springfield, IL 627021811983851
- Susan Hingle, MDSpringfield, IL 627021124003124
- Larry Holder, M.D.Springfield, IL 627021417914326
- Praveen Kandula, M.D.Springfield, IL 627021912982919
- Regina Kovach, M.D.Springfield, IL 627021164407169
Common questions
What is Nicholas Cho Ahn, M.D.'s NPI number?
Nicholas Cho Ahn, M.D.'s National Provider Identifier (NPI) is 1376983346, issued on Jul 5, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Nicholas Cho Ahn, M.D. located?
The NPPES record lists a practice address at 751 N Rutledge St, Springfield, IL, 62702. Phone: (217) 545-8000. Providers update this record themselves, so call before visiting.
How can I verify Nicholas Cho Ahn, M.D.'s license?
NPPES lists Illinois license number 036-141124, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nicholas Cho Ahn, M.D. prescribe under Medicare Part D?
In 2024, Nicholas Cho Ahn, M.D. had 6,369 Medicare Part D claims for 556 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Nicholas Cho Ahn, M.D.'s MIPS final score?
The 2023 MIPS final score is 90.3 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.