Doctor profile · Federal record
Dr. Dennis Chan, M. D.
Gastroenterology Physician (CMS: Gastroenterology) · Monterey Park, CA
- NPI 1053343434
- Accepts Medicare
- 46 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
500 N Garfield Ave, Suite 107
Monterey Park, CA 917541242
(626) 280-3225
fax (626) 280-4222 - Mailing address
-
Po Box 6427
Alhambra, CA 918026427
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- March 3, 2015
- Year of graduation
- 1980 — 46 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- California #A43296
- Medicaid
- CA #00A432961
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1053343434. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
952
Distinct HCPCS
8
Medicare allowed
$117,047
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 334 | 259 | $98 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 278 | 278 | $122 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 95 | 93 | $106 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 86 | 85 | $193 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 64 | 64 | $161 | |
99442 |
Telephone medical discussion with physician, 11-20 minutes | 49 | 48 | $98 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 32 | 32 | $265 | |
45381 |
Injection beneath lining of large bowel using a flexible endoscope | 14 | 14 | $17 |
In context: peer comparison
Among 5 peers in this city , average services per provider: 125. This provider delivers 7.6× the peer median.Open Payments
Industry payments received
All-time total
$847
Transactions
13
Manufacturers
5
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Gilead Sciences, Inc. | 7 | $376.76 | |
| Madrigal Pharmaceuticals | 3 | $172.10 | |
| Ardelyx, Inc. | 1 | $150.00 | |
| Phathom Pharmaceuticals, Inc. | 1 | $125.00 | |
| ABBVIE INC. | 1 | $23.60 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
912
Patients
414
Total drug cost
$265,627
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 226 | 92 | $2,374 |
| Gavilyte-G (Peg3350/Sod Sulf,bicarb,cl/Kcl) | Brand | 125 | 125 | $2,414 |
| Vemlidy (Tenofovir Alafenamide) | Brand | 113 | 15 | $163,270 |
| Tenofovir Disoproxil Fumarate | Generic | 101 | 17 | $15,635 |
| Omeprazole | Generic | 83 | 22 | $905 |
| Clenpiq (Sod Picosulf/Mag Ox/Citric Ac) | Brand | 52 | 52 | $8,942 |
| Mesalamine | Generic | 46 | 0 | $26,417 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,mag Sulfates) | Brand | 30 | 30 | $2,411 |
| Ursodiol | Generic | 28 | 0 | $2,517 |
| Lactulose | Generic | 26 | 11 | $1,651 |
Frequently asked questions
What is Dr. Dennis Chan's medical specialty?
Dr. Dennis Chan practices Gastroenterology Physician in Monterey Park, CA.
Where does Dr. Dennis Chan practice?
Dr. Dennis Chan practices at 500 N Garfield Ave, Monterey Park, CA 917541242. Office phone: 6262803225.
What is Dr. Dennis Chan's NPI?
Dr. Dennis Chan's National Provider Identifier (NPI) is 1053343434, issued by NPPES.
Does Dr. Dennis Chan accept Medicare assignment?
Yes. Dr. Dennis Chan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Dennis Chan commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); New patient office or other outpatient visit (HCPCS 99203); Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239). Source: CMS Medicare Physician & Other Practitioners file.