Dennis Chan, M. D.
NPI 1053343434 · Gastroenterology Physician · Monterey Park, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dennis Chan, M. D. is a Gastroenterology Physician provider in Monterey Park, CA (NPI 1053343434).
Provider details
- NPI number
- 1053343434
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M. D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A43296 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
898 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 415 | $98 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 228 | $120 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 90 | $108 |
| Diagnostic Exam of Large Bowel Using a Flexible Endoscope45378 | 68 | $188 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 44 | $159 |
| Telephone Medical Discussion With Physician, 11-20 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 280 | 118 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 216 | 212 |
| Tenofovir Disoproxil Fumarate | 102 | 19 |
| Tenofovir Alafenamidebrand: Vemlidy | 98 | 17 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 53 | 52 |
| Omeprazole | 45 | 17 |
| Mesalamine |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$847 across 13 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-07
- Last updated
- 2015-03-03
Frequently asked questions
- What is Dennis Chan's NPI number?
- Dennis Chan's National Provider Identifier (NPI) is 1053343434, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dennis Chan's specialty?
- Dennis Chan is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Dennis Chan located?
- Dennis Chan's practice location on file with NPPES is 500 N Garfield Ave, Monterey Park, CA 91754-1242.
- What is Dennis Chan's phone number?
- The practice phone number listed in the NPPES registry for Dennis Chan is (626) 280-3225.
- Does Dennis Chan accept Medicare?
- Dennis Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dennis Chan's NPI active?
- Yes — Dennis Chan's NPI (1053343434) is active in the NPPES registry as of the last update on 2015-03-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.