Chi Yung Ahn, M.D.
Internal Medicine Physician · Chicago, IL
Chi Yung Ahn, M.D. is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1578857835, issued on Jun 4, 2011. Check the license (Illinois 036138610, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Chi Yung Ahn
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036138610 IL
Self-reported in NPPES; status is on the state search - Practice location
- 5140 N California Ave, Chicago, IL 60625
- Phone
- (773) 989-7554
- Enumerated
- Jun 4, 2011
- Record last updated
- Oct 30, 2020 (not updated in 6 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 5140 N California Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sara Ahmed, DOInternal Medicine Physician1992635122
- Moyeed Akhtar, M.D.Pediatrics Physician1033139092
Verify Chi Yung 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 036138610Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $24.04
1 payment: food and beverage; the largest payer was Aimmune Therapeutics, Inc. 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.
Chi Yung Ahn among 7,238 internal medicine physician records in Illinois
Chi Yung 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 2011, is newer than 53% of them.
- NPI issued2011 · 53% of these records are older, 45% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2020 · 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).
2,867 internal medicine physician records list a practice address in Chicago
They are 2,867 of the 63,379 NPPES records with a practice address in Chicago, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Chicago → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Basheeruddin Farooki, MDChicago, IL 606251720038979
- Demetrios Giokaris, MDChicago, IL 606251871501825
- Brijmohan Malani, M.D.Chicago, IL 606251588633192
- Stephen Miff, MDChicago, IL 606251366435901
- Jeffrey Olson, M.D,Chicago, IL 606251952374795
Common questions
What is Chi Yung Ahn, M.D.'s NPI number?
Chi Yung Ahn, M.D.'s National Provider Identifier (NPI) is 1578857835, issued on Jun 4, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Chi Yung Ahn, M.D. located?
The NPPES record lists a practice address at 5140 N California Ave, Chicago, IL, 60625. Phone: (773) 989-7554. Providers update this record themselves, so call before visiting.
How can I verify Chi Yung Ahn, M.D.'s license?
NPPES lists Illinois license number 036138610, 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.
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.