Doctor profile · Federal record
Dr. Sing Chan, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Flushing, NY
- NPI 1225053523
- Accepts Medicare
- 35 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
3808 Union St, Ste 3N
Flushing, NY 113545670
(516) 238-6855
fax (646) 224-8549
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- September 18, 2018
- Year of graduation
- 1991 — 35 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- New York #192380
- Medicaid
- NY #01877912
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1225053523. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,175
Distinct HCPCS
10
Medicare allowed
$212,788
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 242 | 145 | $103 | |
J0171 |
Injection, adrenalin, epinephrine, 0.1 mg | 224 | 51 | $1 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 145 | 144 | $448 | |
99212 |
Established patient office or other outpatient visit, 10-19 minutes | 124 | 95 | $57 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 69 | 69 | $495 | |
36415 |
Insertion of needle into vein for collection of blood sample | 63 | 42 | $8 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 61 | 61 | $132 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 38 | 30 | $148 | |
91200 |
Measurement of liver stiffness | 37 | 37 | $36 | |
46250 |
Removal of multiple external hemorrhoids | 27 | 24 | $539 |
In context: peer comparison
Among 11 peers in Flushing Gastroenterology Physician, average services per provider: 72. This provider delivers 16× the peer median.Open Payments
Industry payments received
All-time total
$1,993
Transactions
101
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Gilead Sciences, INC. | 20 | $449.81 | |
| Ardelyx, INC. | 11 | $281.40 | |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | 14 | $271.57 | |
| Pfizer INC. | 9 | $193.91 | |
| Intra-Sana Laboratories | 11 | $166.46 | |
| Abbvie INC. | 16 | $160.50 | |
| Phathom Pharmaceuticals, INC. | 3 | $77.22 | |
| Janssen Biotech, INC. | 3 | $74.23 | |
| Takeda Pharmaceuticals U.S.A., INC. | 3 | $71.27 | |
| Celgene Corporation | 3 | $68.91 | |
| Celltrion USA INC. | 2 | $42.44 | |
| Aimmune Therapeutics, INC. | 2 | $40.05 | |
| Ironwood Pharmaceuticals, INC | 2 | $30.75 | |
| Qol Medical, LLC | 1 | $22.99 | |
| RedHill Biopharma INC. | 1 | $22.20 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
4,074
Patients
1,890
Total drug cost
$2,226,486
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Famotidine | Generic | 700 | 329 | $16,369 |
| Omeprazole | Generic | 631 | 270 | $6,628 |
| Amoxicillin | Generic | 547 | 359 | $3,609 |
| Linzess (Linaclotide) | Brand | 448 | 153 | $290,993 |
| Vemlidy (Tenofovir Alafenamide) | Brand | 319 | 49 | $477,525 |
| Hydrocortisone | Generic | 280 | 120 | $6,851 |
| Ibsrela (Tenapanor Hcl) | Brand | 227 | 131 | $925,513 |
| Procto-MED Hc (Hydrocortisone) | Brand | 207 | 86 | $5,031 |
| Proctozone-Hc (Hydrocortisone) | Brand | 125 | 65 | $2,980 |
| Mesalamine | Generic | 119 | 21 | $60,449 |
Frequently asked questions
What is Dr. Sing Chan's medical specialty?
Dr. Sing Chan practices Gastroenterology Physician in Flushing, NY.
Where does Dr. Sing Chan practice?
Dr. Sing Chan practices at 3808 Union St, Flushing, NY 113545670. Office phone: 5162386855.
What is Dr. Sing Chan's NPI?
Dr. Sing Chan's National Provider Identifier (NPI) is 1225053523, issued by NPPES.
Does Dr. Sing Chan accept Medicare assignment?
Yes. Dr. Sing Chan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Sing Chan commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Injection, adrenalin, epinephrine, 0.1 mg (HCPCS J0171); Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239). Source: CMS Medicare Physician & Other Practitioners file.