Dr. Wallen Cy Chan, MD
- Medicare services, 2024
- 565
- Medicare patients, 2024
- 350
- Part D claims, 2024
- 1,901
- MIPS score, 2024
- 71
- Hospital affiliations
- 2
- Practice address
- 355 Bard Avenue, Staten Island, NY 10310
- Practice phone
- Call (718) 354-5047
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Chan'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. Wallen Cy Chan is a gastroenterologist in Staten Island, New York
Dr. Chan practices at Richmond University Medical Center in Staten Island, New York, part of Richmond University Medical Center.
Dr. Chan's NPI, 1043287857, was assigned on March 1, 2006. Dr. Chan graduated from Icahn School of Medicine at Mount Sinai in 1989. Dr. Chan holds New York license 183203.
- NPI
- 1043287857NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3971515040
- NPI enumeration date
- March 1, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (718) 354-5047
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Wallen Cy Chan practices at Richmond University Medical Center in Staten Island, New York
Dr. Chan's primary practice is Richmond University Medical Center, at 355 Bard Avenue, Staten Island, NY 10310 in Richmond County. The practice phone is (718) 354-5047.
- Richmond University Medical Center355 Bard Avenue, Staten Island, NY 10310 · Richmond CountyPhone(718) 354-5047
Source: Dmand AI Affiliation Data
Dr. Wallen Cy Chan is affiliated with 3 sites of care and 1 medical group
Dr. Chan's primary practice is Richmond University Medical Center in Staten Island, New York, part of Richmond University Medical Center. Dr. Chan is also affiliated with Staten Island University Hospital. The medical group on file is Amboy Medical Practice PC. Dmand AI also links Dr. Chan to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Wallen Cy Chan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chan practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Richmond University Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Richmond University Medical Center and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Wallen Cy Chan is one of 1,583 gastroenterologists in New York
Gastroenterology is Dr. Chan's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Chan is licensed in New York.
Specialties and state licenses
- Gastroenterology, New YorkPrimary
Gastroenterologists near Dr. Chan
Counts of gastroenterologists 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. Wallen Cy Chan billed Medicare for 565 services in 2024
CMS data shows 565 Medicare services from Dr. Chan across 8 procedure codes in 2024, for 350 Medicare patients. Medicare paid $74,280 for them.
Dr. Chan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5052024: 41518%
- Surgery
- 2023: 1832024: 15018%
- Drugs given in the office
- 2023: 202024: 0100%
- Lab and pathology
- 2023: 1032024: 0100%
Where Dr. Chan's Medicare services took place, 2024
- In an office43777%
- In a facility12823%
Dr. Chan compared with the New York median for gastroenterologists, 2024
- Dr. Chan
- New York median
- Medicare services
- 565vs 42134% above
- Medicare patients
- 350vs 23648% above
- Part D claims
- 1,744vs 3824.6 times
Medians across 1,551 gastroenterologists in New York with Dmand AI profiles that report each measure.
Dr. Chan'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Wallen Cy Chan treated 350 Medicare patients in 2024, average age 73
CMS counts 350 Medicare patients who saw Dr. Chan in 2024. The largest group is 65 to 74, with 158 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 13% are also on Medicaid. Their average risk score is 1.32, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Chan's median patient age at 65, with 53% women.
Dr. Chan's Medicare patients by age, 2024
Dr. Chan's Medicare patients by sex, 2024
- Women18854%
- Men16246%
Chronic conditions among Dr. Chan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes57%
- Arthritis49%
- Ischemic heart disease34%
- Anxiety26%
- Cancer23%
- Chronic kidney disease22%
Share of Medicare patients with each condition. A patient can have several.
Dr. Chan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women53%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Wallen Cy Chan wrote 1,901 Medicare Part D claims in 2024
In 2024, Dr. Chan wrote 1,901 Medicare Part D claims for 534 patients. 88% of them were for generic drugs. CMS names the drug for 1,744 of them, across 24 drugs with 11 or more claims each, at $139,890 in total drug cost. In 2023, CMS named 1,403 claims across 21 drugs.
Dr. Chan's Part D claims by kind of drug, 2024
- Generic1,681 claims88%
- Brand-name220 claims12%
Dr. Chan'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. Chan's Part D claims, 2024
- Antibiotics4%80 of 1,901 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: 1,4032024: 1,74424%
Drugs named by CMS: 24 in 2024, 21 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. Wallen Cy Chan scored 71 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 71 out of 100 for Dr. Chan for performance year 2024, reported through an alternative payment model (APM). Dr. Chan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 128 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Chan, more than 82% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Chan's MIPS scores, performance year 2024
- 71of 100Final score
- 82.9of 100Quality
- 6of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Chan ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 82nd percentile128 procedures
- Colonoscopy
- 78th percentile94 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Wallen Cy Chan received $7,129 in industry payments from 2016 to 2025
CMS Open Payments shows 398 general payments to Dr. Chan from 28 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 97% of the total. Abbvie Inc. paid the most, $1,454.
General payments to Dr. Chan by program year, 2016 to 2025
General payments to Dr. Chan by kind, 2016 to 2025
- Food and beverage$6,90997%
- Education$2203%
Companies that paid Dr. Chan the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Wallen Cy Chan graduated from Icahn School of Medicine at Mount Sinai
Dr. Chan graduated from Icahn School of Medicine at Mount Sinai in 1989.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Wallen Cy Chan'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 DataDmand AI Org Hierarchy 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)Clinician Public Reporting: Overall MIPS Performance (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. Wallen Cy Chan
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. Wallen Cy Chan's NPI number?
Dr. Wallen Cy Chan's NPI number is 1043287857. It was assigned on March 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Wallen Cy Chan?
Dr. Wallen Cy Chan is a gastroenterologist in Staten Island, New York. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Wallen Cy Chan practice?
Dr. Chan practices at 355 Bard Avenue, Staten Island, NY 10310. Dr. Chan's primary practice is Richmond University Medical Center in Staten Island, New York, part of Richmond University Medical Center. Dmand AI also links Dr. Chan to 1 group practice or clinic.
What is Dr. Wallen Cy Chan's office phone number?
The practice phone on file for Dr. Chan is (718) 354-5047.
What is Dr. Wallen Cy Chan's medical license number?
Dr. Chan holds New York license 183203.
Which hospitals is Dr. Wallen Cy Chan affiliated with?
Dr. Chan practices at Richmond University Medical Center in Staten Island, New York. Dr. Chan is also affiliated with Staten Island University Hospital.
What medical group is Dr. Wallen Cy Chan part of?
Dr. Chan is linked to Amboy Medical Practice PC.
Does Dr. Wallen Cy Chan accept Medicare?
Yes. CMS data shows Dr. Chan billed Medicare for 565 services in 2024, and Dr. Chan accepts Medicare assignment.
What is Dr. Wallen Cy Chan's MIPS score?
Dr. Chan's MIPS final score for performance year 2024 is 71 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Wallen Cy Chan see?
CMS counts 350 Medicare patients who saw Dr. Chan in 2024, with an average age of 73.
Show 5 more questionsShow fewer questions
What services does Dr. Wallen Cy Chan bill to Medicare?
In 2024, Dr. Chan's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and office visit, new patient (99204).
Where did Dr. Wallen Cy Chan go to medical school?
Dr. Chan graduated from Icahn School of Medicine at Mount Sinai in 1989.
What drugs does Dr. Wallen Cy Chan prescribe most?
In 2024 Medicare Part D data, Dr. Chan's most prescribed drugs by claims were Famotidine, Pantoprazole Sodium and Omeprazole.
Has Dr. Wallen Cy Chan received payments from drug or device companies?
CMS Open Payments shows $7,129 in general payments to Dr. Chan from 28 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Wallen Cy Chan been practicing?
Dr. Chan graduated from medical school in 1989, 37 years ago.
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