Dr. Nga Yan Siu, DO
- Medicare services, 2024
- 3,610
- Medicare patients, 2024
- 794
- Part D claims, 2024
- 2,168
- Hospital affiliations
- 1
- Industry payments
- $2,816
- Practice address
- 33 Research Way Ste 13 Suite 13, East Setauket, NY 11733
- Practice phone
- Call (631) 444-4090
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Stony Brook Ophthalmology
Eye care practice · East Setauket, New York
Find Dr. Siu's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Nga Yan Siu is an ophthalmologist in East Setauket, New York
Dr. Siu practices at Stony Brook Ophthalmology in East Setauket, New York.
Dr. Siu's NPI, 1902284169, was assigned on May 8, 2015. Dr. Siu graduated from NYIT College Of Osteopathic Medicine in 2015. Dr. Siu holds New York license 288888.
- NPI
- 1902284169NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4789083288
- NPI enumeration date
- May 8, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (631) 444-4090
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nga Yan Siu practices at Stony Brook Ophthalmology in East Setauket, New York
Dr. Siu's primary practice is Stony Brook Ophthalmology, at 33 Research Way Ste 13 Suite 13, East Setauket, NY 11733. The practice phone is (631) 444-4090.
- Stony Brook Ophthalmology33 Research Way Ste 13 Suite 13, East Setauket, NY 11733Phone(631) 444-4090
Source: Dmand AI Affiliation Data
Dr. Nga Yan Siu is affiliated with 2 sites of care and 1 medical group
Dr. Siu's primary practice is Stony Brook Ophthalmology in East Setauket, New York. Dr. Siu is also affiliated with Stony Brook University Hospital. Dmand AI also links Dr. Siu to 1 more medical group, named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Nga Yan Siu's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Siu practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Stony Brook Ophthalmology | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nga Yan Siu is one of 1,467 ophthalmologists in New York
Ophthalmology is Dr. Siu's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dmand AI has Dr. Siu's licenses on file in 2 states: New York and New Jersey.
Specialties and state licenses
- Ophthalmology, New YorkPrimary
- New Jersey license
Ophthalmologists near Dr. Siu
Counts of ophthalmologists 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. Nga Yan Siu billed Medicare for 3,610 services in 2024
CMS data shows 3,610 Medicare services from Dr. Siu across 13 procedure codes in 2024, for 794 Medicare patients. Medicare paid $219,211 for them.
Dr. Siu's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 1,8712024: 3,29376%
- Imaging
- 2023: 1992024: 22413%
- Surgery
- 2023: 282024: 93232%
Where Dr. Siu's Medicare services took place, 2024
- In an office3,56599%
- In a facility451%
Dr. Siu compared with the New York median for ophthalmologists, 2024
- Dr. Siu
- New York median
- Medicare services
- 3,610vs 1,2582.9 times
- Medicare patients
- 794vs 43682% above
- Part D claims
- 2,043vs 6473.2 times
Medians across 1,557 ophthalmologists in New York with Dmand AI profiles that report each measure.
Dr. Siu'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. Siu and other ophthalmologists in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nga Yan Siu treated 794 Medicare patients in 2024, average age 77
CMS counts 794 Medicare patients who saw Dr. Siu in 2024. The largest group is 75 to 84, with 337 patients. 75% of them have high cholesterol, and 74% have high blood pressure. 11% are also on Medicaid. Their average risk score is 1.13, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Siu's median patient age at 66, with 55% women.
Dr. Siu's Medicare patients by age, 2024
Dr. Siu's Medicare patients by sex, 2024
- Women47460%
- Men32040%
Chronic conditions among Dr. Siu's Medicare patients, 2024
- High cholesterol75%
- High blood pressure74%
- Arthritis45%
- Ischemic heart disease33%
- Diabetes26%
- Anxiety24%
- Mood disorders21%
- Atrial fibrillation20%
Share of Medicare patients with each condition. A patient can have several.
Dr. Siu's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women55%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nga Yan Siu wrote 2,168 Medicare Part D claims in 2024
In 2024, Dr. Siu wrote 2,168 Medicare Part D claims for 481 patients. 64% of them were for generic drugs. CMS names the drug for 2,043 of them, across 25 drugs with 11 or more claims each, at $444,240 in total drug cost. In 2023, CMS named 1,188 claims across 23 drugs.
Dr. Siu's Part D claims by kind of drug, 2024
- Generic1,398 claims64%
- Brand-name770 claims36%
Dr. Siu'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.
Drug classes CMS tracks in Dr. Siu's Part D claims, 2024
- Antibiotics2%34 of 2,168 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,1882024: 2,04372%
Drugs named by CMS: 25 in 2024, 23 in 2023.
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. Nga Yan Siu ranks in the 75th percentile for cataract surgery in Medicare
Dr. Siu accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 106 procedures of cataract surgery by Dr. Siu, more than 75% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Siu ranks in Medicare procedure volume
- Cataract surgery
- 75th percentile106 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Nga Yan Siu received $2,816 in industry payments from 2021 to 2025
CMS Open Payments shows 69 general payments to Dr. Siu from 18 drug and device companies from 2021 to 2025. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $595.
General payments to Dr. Siu by program year, 2021 to 2025
Companies that paid Dr. Siu 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. Nga Yan Siu graduated from NYIT College Of Osteopathic Medicine
Dr. Siu graduated from NYIT College Of Osteopathic Medicine in 2015.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Nga Yan Siu'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. Nga Yan Siu
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. Nga Yan Siu's NPI number?
Dr. Nga Yan Siu's NPI number is 1902284169. It was assigned on May 8, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Nga Yan Siu?
Dr. Nga Yan Siu is an ophthalmologist in East Setauket, New York. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Nga Yan Siu practice?
Dr. Siu practices at 33 Research Way Ste 13 Suite 13, East Setauket, NY 11733. Dr. Siu's primary practice is Stony Brook Ophthalmology in East Setauket, New York. Dmand AI also links Dr. Siu to 1 medical group.
What is Dr. Nga Yan Siu's office phone number?
The practice phone on file for Dr. Siu is (631) 444-4090.
What is Dr. Nga Yan Siu's medical license number?
Dr. Siu holds New York license 288888, one of the licenses on file in 2 states.
Which states has Dr. Nga Yan Siu been licensed in?
Dmand AI has state licenses on file for Dr. Siu in New York and New Jersey.
Which hospitals is Dr. Nga Yan Siu affiliated with?
Dr. Siu is affiliated with Stony Brook University Hospital.
Does Dr. Nga Yan Siu accept Medicare?
Yes. CMS data shows Dr. Siu billed Medicare for 3,610 services in 2024, and Dr. Siu accepts Medicare assignment.
How many Medicare patients does Dr. Nga Yan Siu see?
CMS counts 794 Medicare patients who saw Dr. Siu in 2024, with an average age of 77.
What services does Dr. Nga Yan Siu bill to Medicare?
In 2024, Dr. Siu's most billed Medicare services were eye exam or test (92012), eye exam or test (92133) and eye exam or test (92020).
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Where did Dr. Nga Yan Siu go to medical school?
Dr. Siu graduated from NYIT College Of Osteopathic Medicine in 2015.
What drugs does Dr. Nga Yan Siu prescribe most?
In 2024 Medicare Part D data, Dr. Siu's most prescribed drugs by claims were Latanoprost, Dorzolamide-Timolol and Brimonidine Tartrate.
Has Dr. Nga Yan Siu received payments from drug or device companies?
CMS Open Payments shows $2,816 in general payments to Dr. Siu from 18 companies from 2021 to 2025. The largest total came from Alcon Laboratories Inc.
How long has Dr. Nga Yan Siu been practicing?
Dr. Siu graduated from medical school in 2015, 11 years ago.
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