Nicholas Junhyuk Ahn, M.D.
Surgery Physician · Stony Brook, NY
Nicholas Junhyuk Ahn, M.D. is a surgery physician with a practice address in Stony Brook, New York, and NPI 1912341447, issued on Apr 26, 2013. Check the license (New York 306605, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Nicholas Junhyuk Ahn
- Credential
- M.D.
- Primary taxonomy
- Surgery Physician 208600000X
- License number
- 306605 NY
Self-reported in NPPES; status is on the state search - Practice location
- Health Science Tower Level 19, Room 030, Stony Brook, NY 11794
- Phone
- (631) 444-1791
- Enumerated
- Apr 26, 2013
- Record last updated
- Sep 7, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210920003281); accepts Medicare assignment
- Medical or professional school
- Pennsylvania State University College Of Medicine, 2013
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 2,053 in New York → Look up another NPI →
Also registered at Health Science Tower Level 19, Room 030
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Athanasios Angistriotis, MDStudent in an Organized Health Care Education/Training Program1134862790
- Kevin DuhVascular Surgery Physician1306306568
Verify Nicholas Junhyuk Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 306605Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average surgery physician in 2024
34 Medicare Part D claims for 26 beneficiaries, against an average of 147 among the 20,115 providers of this specialty who prescribed in Part D. Brand-name drugs were 38% of claims.
Most prescribed
- Clenpiq12 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): 98.5 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: $426.60
7 payments; by number, the most common kind was food and beverage; the largest payer was Galvanize Therapeutics, Inc. The 17,103 providers of this specialty with any payment received $3,513.80 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
- Stony Brook Surgical Associates University Faculty Practice CorporatiHampton Bays, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nicholas Junhyuk Ahn among 2,053 surgery physician records in New York
Nicholas Junhyuk Ahn, M.D. is one of 2,053 surgery physician records with a practice address in New York. 74% 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 76% of them.
- NPI issued2013 · 76% of these records are older, 22% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2013 · median 2002 among the 1,212 with a school on file
- Record last updated2021 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
32 surgery physician records list a practice address in Stony Brook
They are 32 of the 3,053 NPPES records with a practice address in Stony Brook, and 2,053 surgery physician records in New York.
All 2,053 in New York → Every provider in Stony Brook → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Andrew BatesStony Brook, NY 117941487971164
- Roberto Bergamaschi, MDStony Brook, NY 117941497755318
- Thomas Bilfinger, M.D.Stony Brook, NY 117941780602730
- Svetlana Danovich, DOStony Brook, NY 117941801056312
- Randeep Jawa, MDStony Brook, NY 117941114993177
- Pamela KimStony Brook, NY 117941669799698
- Irvin Krukenkamp, M.D.Stony Brook, NY 117941457373292
- Aurora Pryor, M.D.Stony Brook, NY 117941336223221
Common questions
What is Nicholas Junhyuk Ahn, M.D.'s NPI number?
Nicholas Junhyuk Ahn, M.D.'s National Provider Identifier (NPI) is 1912341447, issued on Apr 26, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Nicholas Junhyuk Ahn, M.D. located?
The NPPES record lists a practice address at Health Science Tower Level 19, Room 030, Stony Brook, NY, 11794. Phone: (631) 444-1791. Providers update this record themselves, so call before visiting.
How can I verify Nicholas Junhyuk Ahn, M.D.'s license?
NPPES lists New York license number 306605, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nicholas Junhyuk Ahn, M.D. prescribe under Medicare Part D?
In 2024, Nicholas Junhyuk Ahn, M.D. had 34 Medicare Part D claims for 26 beneficiaries; the average among surgery physician prescribers was 147. Part D covers Medicare prescriptions only.
What is Nicholas Junhyuk Ahn, M.D.'s MIPS final score?
The 2023 MIPS final score is 98.5 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.