Joon S. Ahn, M.D.
Orthopaedic Hand Surgery Physician · Mount Vernon, IL
Joon S. Ahn, M.D. is an orthopaedic hand surgery physician with a practice address in Mount Vernon, Illinois, and NPI 1083681027, issued on Mar 8, 2006. Check the license (Illinois 036104840, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Joon S. Ahn
- Credential
- M.D.
- Primary taxonomy
- Orthopaedic Hand Surgery Physician 207XS0106X
- License number
- 036104840 IL
Self-reported in NPPES; status is on the state search - Practice location
- 4121 Veterans Memorial Dr, Mount Vernon, IL 62864
- Phone
- (618) 242-3778
- Enumerated
- Mar 8, 2006
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (618) 242-2551
- Medicaid ID
- 036104840 IL
- Medicare enrollment
- Enrolled (PECOS I20100604001096); accepts Medicare assignment
- Medical or professional school
- Temple University School Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest orthopaedic hand surgery physician records → All 129 in Illinois → Look up another NPI →
Also registered at 4121 Veterans Memorial Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sherri Bailey, MS PTPhysical Therapist1821041658
- Lindsey Bearden, RNRegistered Nurse1932920717
- Stacie Chambliss, PTPhysical Therapist1780832253
- James Chow, M.D.Orthopaedic Surgery Physician1396712436
- Melanie Cross, FNPFamily Nurse Practitioner1093197410
- Robert Dow, MDOrthopaedic Surgery of the Spine Physician1699272732
Verify Joon S. 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 036104840Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% more Medicare Part D claims than the average orthopaedic hand surgery physician in 2024
232 Medicare Part D claims for 122 beneficiaries, against an average of 186 among the 2,203 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 120 claims were for opioids.
Most prescribed
- Ondansetron Hcl96 claims
- Hydrocodone-Acetaminophen95 claims
- Oxycodone-Acetaminophen18 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $34.16
2 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 1,819 providers of this specialty with any payment received $5,529.86 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 2 group practices
- Orthopaedic Center OF Southern Illinois, LtdMount Vernon, IL
- Select Physical Therapy Holdings IncBenton, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joon S. Ahn among 129 orthopaedic hand surgery physician records in Illinois
Joon S. Ahn, M.D. is one of 129 orthopaedic hand surgery physician records with a practice address in Illinois. 89% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 51% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 82% of these records are
- Graduated1995 · median 2004 among the 106 with a school on file
- Record last updated2007 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207XS0106X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Hand Surgery Physician providers in Illinois
There are 129 orthopaedic hand surgery physician records in Illinois.
All 129 in Illinois → Every provider in Mount Vernon → Orthopaedic Hand Surgery Physician nationwide →
The 8 orthopaedic hand surgery physician records with the nearest ZIP codes
- Michael Gainer, M.D.Springfield, IL 627111922068303
- Christopher Maender, MDSpringfield, IL 627111376763227
- Jeffery Smith, M.D.Decatur, IL 625261104841188
- Lisa Sasso, MDEffingham, IL 624011790941581
- Andres Lerner, MDO Fallon, IL 622691285865204
- Elissa Davis, M.D.Belleville, IL 622261629496203
- Timothy Leeburton, M.D.Belleville, IL 622261104823574
- Harvey Mirly, M.D.Belleville, IL 622261447203971
Common questions
What is Joon S. Ahn, M.D.'s NPI number?
Joon S. Ahn, M.D.'s National Provider Identifier (NPI) is 1083681027, issued on Mar 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joon S. Ahn, M.D. located?
The NPPES record lists a practice address at 4121 Veterans Memorial Dr, Mount Vernon, IL, 62864. Phone: (618) 242-3778. Providers update this record themselves, so call before visiting.
How can I verify Joon S. Ahn, M.D.'s license?
NPPES lists Illinois license number 036104840, 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 Joon S. Ahn, M.D. prescribe under Medicare Part D?
In 2024, Joon S. Ahn, M.D. had 232 Medicare Part D claims for 122 beneficiaries; the average among orthopaedic hand surgery physician prescribers was 186. Part D covers Medicare prescriptions only.
What is Joon S. Ahn, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.