Dr. Nicholas Junhyuk Ahn, MD
- Medicare services, 2024
- 163
- Medicare patients, 2024
- 152
- Part D claims, 2024
- 34
- Hospital affiliations
- 1
- Industry payments
- $1,685
- Practice address
- 37 Research Way, East Setauket, NY 11733
- Practice phone
- Call (631) 444-8278
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Stony Brook Surgical Associates
Multi-specialty group site · East Setauket, New York
Find Dr. Ahn's professional email, personal email and mobile number
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Dr. Nicholas Junhyuk Ahn is a general surgeon in East Setauket, New York
Dr. Ahn practices at Stony Brook Surgical Associates in East Setauket, New York.
Dr. Ahn's NPI, 1912341447, was assigned on April 26, 2013. Dr. Ahn graduated from Pennsylvania State University College of Medicine in 2013. Dr. Ahn holds New York license 306605.
- NPI
- 1912341447NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2163769613
- NPI enumeration date
- April 26, 2013
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (631) 444-8278
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nicholas Junhyuk Ahn practices at Stony Brook Surgical Associates in East Setauket, New York
Dr. Ahn's primary practice is Stony Brook Surgical Associates, at 37 Research Way, East Setauket, NY 11733. The practice phone is (631) 444-8278.
- Stony Brook Surgical Associates37 Research Way, East Setauket, NY 11733Phone(631) 444-8278
Source: Dmand AI Affiliation Data
Dr. Nicholas Junhyuk Ahn is affiliated with 5 sites of care and 1 medical group
Dr. Ahn's primary practice is Stony Brook Surgical Associates in East Setauket, New York. Dr. Ahn is also affiliated with Stony Brook University Hospital. The medical group on file is Stony Brook Surgical Associates. Dmand AI also links Dr. Ahn to 3 more home health agencies, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Nicholas Junhyuk Ahn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ahn practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Stony Brook Surgical Associates | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nicholas Junhyuk Ahn is one of 1,604 general surgeons in New York
Surgery is Dr. Ahn's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Ahn is licensed in New York.
Specialties and state licenses
- Surgery, New YorkPrimary
General surgeons near Dr. Ahn
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Nicholas Junhyuk Ahn billed Medicare for 163 services in 2024
CMS data shows 163 Medicare services from Dr. Ahn across 6 procedure codes in 2024, for 152 Medicare patients. Medicare paid $19,285 for them.
Dr. Ahn's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1362024: 9133%
- Surgery
- 2023: 1192024: 7239%
Where Dr. Ahn's Medicare services took place, 2024
- In an office10866%
- In a facility5534%
Dr. Ahn compared with the New York median for general surgeons, 2024
- Dr. Ahn
- New York median
- Medicare services
- 163vs 1546% above
- Medicare patients
- 152vs 10939% above
- Part D claims
- 12vs 2450% below
Medians across 1,502 general surgeons in New York with Dmand AI profiles that report each measure.
Dr. Ahn's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ahn and other general surgeons in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nicholas Junhyuk Ahn treated 152 Medicare patients in 2024, average age 72
CMS counts 152 Medicare patients who saw Dr. Ahn in 2024. The largest group is 65 to 74, with 71 patients. 75% of them have high cholesterol, and 72% have high blood pressure. 18% are also on Medicaid. Their average risk score is 1.51, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Ahn's median patient age at 59, with 41% women.
Dr. Ahn's Medicare patients by age, 2024
Dr. Ahn's Medicare patients by sex, 2024
- Women7952%
- Men7348%
Chronic conditions among Dr. Ahn's Medicare patients, 2024
- High cholesterol75%
- High blood pressure72%
- Arthritis50%
- Anxiety38%
- Ischemic heart disease38%
- Diabetes36%
- Mood disorders36%
- Depression33%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ahn's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women41%
- Men57%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nicholas Junhyuk Ahn wrote 34 Medicare Part D claims in 2024
In 2024, Dr. Ahn wrote 34 Medicare Part D claims for 26 patients. 62% of them were for generic drugs. CMS names the drug for 12 of them, across 1 drug with 11 or more claims each, at $2,047 in total drug cost. In 2019, CMS named 22 claims across 2 drugs.
Dr. Ahn's Part D claims by kind of drug, 2024
- Generic21 claims62%
- Brand-name13 claims38%
Dr. Ahn's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2019 to 2024
- 2019
- 2024
- Claims for drugs CMS names
- 2019: 222024: 1245%
Drugs named by CMS: 1 in 2024, 2 in 2019.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Nicholas Junhyuk Ahn ranks in the 59th percentile for colonoscopy in Medicare
Dr. Ahn accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Ahn as offering telehealth. CMS counts 40 procedures of colonoscopy by Dr. Ahn, more than 59% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Ahn ranks in Medicare procedure volume
- Colonoscopy
- 59th percentile40 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Nicholas Junhyuk Ahn received $1,685 in industry payments from 2021 to 2025
CMS Open Payments shows 24 general payments to Dr. Ahn from 10 drug and device companies from 2021 to 2025. Food and beverage make up the largest share, 92% of the total. Medtronic, Inc. paid the most, $525.
General payments to Dr. Ahn by program year, 2021 to 2025
General payments to Dr. Ahn by kind, 2021 to 2025
- Food and beverage$1,55292%
- Travel and lodging$1338%
Companies that paid Dr. Ahn the most, 2021 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Nicholas Junhyuk Ahn graduated from Pennsylvania State University College of Medicine
Dr. Ahn graduated from Pennsylvania State University College of Medicine in 2013.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Nicholas Junhyuk Ahn's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Nicholas Junhyuk Ahn
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Nicholas Junhyuk Ahn's NPI number?
Dr. Nicholas Junhyuk Ahn's NPI number is 1912341447. It was assigned on April 26, 2013, and it is active in the NPI Registry.
What kind of doctor is Dr. Nicholas Junhyuk Ahn?
Dr. Nicholas Junhyuk Ahn is a general surgeon in East Setauket, New York. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Nicholas Junhyuk Ahn practice?
Dr. Ahn practices at 37 Research Way, East Setauket, NY 11733. Dr. Ahn's primary practice is Stony Brook Surgical Associates in East Setauket, New York. Dmand AI also links Dr. Ahn to 3 home health agencies.
What is Dr. Nicholas Junhyuk Ahn's office phone number?
The practice phone on file for Dr. Ahn is (631) 444-8278.
What is Dr. Nicholas Junhyuk Ahn's medical license number?
Dr. Ahn holds New York license 306605.
Which hospitals is Dr. Nicholas Junhyuk Ahn affiliated with?
Dr. Ahn is affiliated with Stony Brook University Hospital.
What medical group is Dr. Nicholas Junhyuk Ahn part of?
Dr. Ahn is linked to Stony Brook Surgical Associates.
Does Dr. Nicholas Junhyuk Ahn accept Medicare?
Yes. CMS data shows Dr. Ahn billed Medicare for 163 services in 2024, and Dr. Ahn accepts Medicare assignment.
Does Dr. Nicholas Junhyuk Ahn offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Ahn as offering telehealth services.
How many Medicare patients does Dr. Nicholas Junhyuk Ahn see?
CMS counts 152 Medicare patients who saw Dr. Ahn in 2024, with an average age of 72.
Show 5 more questionsShow fewer questions
What services does Dr. Nicholas Junhyuk Ahn bill to Medicare?
In 2024, Dr. Ahn's most billed Medicare services were office visit, new patient (99203), office visit, established patient (99213) and surgery: digestive system (45385).
Where did Dr. Nicholas Junhyuk Ahn go to medical school?
Dr. Ahn graduated from Pennsylvania State University College of Medicine in 2013.
What drugs does Dr. Nicholas Junhyuk Ahn prescribe most?
In 2024 Medicare Part D data, Dr. Ahn's most prescribed drugs by claims were Clenpiq.
Has Dr. Nicholas Junhyuk Ahn received payments from drug or device companies?
CMS Open Payments shows $1,685 in general payments to Dr. Ahn from 10 companies from 2021 to 2025. The largest total came from Medtronic, Inc.
How long has Dr. Nicholas Junhyuk Ahn been practicing?
Dr. Ahn graduated from medical school in 2013, 13 years ago.
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