Doctor profile · Federal record
Dr. Wallen Chan, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Staten Island, NY
- NPI 1043287857
- Accepts Medicare
- MIPS 61.8 / 100 · 2023
- 37 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
78 Todt Hill RD
Staten Island, NY 103144528
(718) 448-1122
fax (718) 448-8318 - Mailing address
-
4 Airdale Dr
Kendall Park, NJ 088241494
Credentials & registration
- NPI registered
- March 2006 — 20 yrs on file
- Profile last updated
- April 14, 2008
- Year of graduation
- 1989 — 37 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- New York #183203
- Medicaid
- NY #01768538
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1043287857. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
811
Distinct HCPCS
10
Medicare allowed
$116,473
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 244 | 183 | $146 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 106 | 85 | $101 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 100 | 100 | $194 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 68 | 68 | $127 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 60 | 59 | $294 | |
88305 |
Pathology examination of tissue using a microscope, intermediate complexity | 57 | 16 | $40 | |
88313 |
Special stained specimen slides to examine tissue including interpretation and report | 46 | 12 | $13 | |
99490 |
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 39 | 38 | $72 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 34 | 34 | $205 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 21 | 20 | $446 |
In context: peer comparison
Among 11 peers in this city , average services per provider: 92. This provider delivers 8.8× the peer median.Open Payments
Industry payments received
All-time total
$512
Transactions
21
Manufacturers
10
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Madrigal Pharmaceuticals | 1 | $128.87 | |
| Janssen Biotech, Inc. | 5 | $114.31 | |
| Salix Pharmaceuticals, a division of Bausch Health US, LLC | 4 | $72.48 | |
| ABBVIE INC. | 3 | $60.39 | |
| Merck Sharp & Dohme LLC | 2 | $38.46 | |
| Takeda Pharmaceuticals U.S.A., Inc. | 2 | $31.29 | |
| QOL Medical, LLC | 1 | $21.36 | |
| IRONWOOD PHARMACEUTICALS, INC | 1 | $15.89 | |
| Gilead Sciences, Inc. | 1 | $14.35 | |
| Phathom Pharmaceuticals, Inc. | 1 | $14.14 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
1,322
Patients
492
Total drug cost
$91,856
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Famotidine | Generic | 340 | 111 | $6,134 |
| Omeprazole | Generic | 272 | 69 | $3,223 |
| Pantoprazole Sodium | Generic | 270 | 79 | $3,721 |
| Gavilyte-C (Peg3350/Sod Sulf,bicarb,cl/Kcl) | Brand | 63 | 63 | $1,069 |
| Hydrocortisone | Generic | 53 | 27 | $1,025 |
| Peg 3350-Electrolyte (Sodium Chloride/Nahco3/Kcl/Peg) | Brand | 47 | 47 | $820 |
| Dicyclomine Hcl | Generic | 39 | 17 | $739 |
| Mesalamine | Generic | 38 | 0 | $23,969 |
| Metoclopramide Hcl | Generic | 38 | 16 | $299 |
| Gavilyte-G (Peg3350/Sod Sulf,bicarb,cl/Kcl) | Brand | 37 | 37 | $567 |
Hospital affiliations
Frequently asked questions
What is Dr. Wallen Chan's medical specialty?
Dr. Wallen Chan practices Gastroenterology Physician in Staten Island, NY.
Where does Dr. Wallen Chan practice?
Dr. Wallen Chan practices at 78 Todt Hill RD, Staten Island, NY 103144528. Office phone: 7184481122.
What is Dr. Wallen Chan's NPI?
Dr. Wallen Chan's National Provider Identifier (NPI) is 1043287857, issued by NPPES.
Does Dr. Wallen Chan accept Medicare assignment?
Yes. Dr. Wallen Chan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Wallen Chan commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99213); New patient office or other outpatient visit (HCPCS 99204). Source: CMS Medicare Physician & Other Practitioners file.