Wallen Chan, M.D.
NPI 1043287857 · Gastroenterology Physician · Staten Island, NY
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Wallen Chan, M.D. is a Gastroenterology Physician provider in Staten Island, NY (NPI 1043287857).
Provider details
- NPI number
- 1043287857
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 183203 (NY)
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
20 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
565 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 | 150 | $109 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 121 | $154 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 78 | $201 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 53 | $127 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 51 | $298 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 24 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Famotidine | 371 | 126 |
| Pantoprazole Sodium | 358 | 104 |
| Omeprazole | 322 | 84 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 134 | 125 |
| Hydrocortisone | 73 | 37 |
| Dicyclomine Hcl | 54 | 24 |
| Linaclotidebrand: Linzess | 50 | 12 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$512 across 21 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
- 2006-03-01
- Last updated
- 2008-04-14
Frequently asked questions
- What is Wallen Chan's NPI number?
- Wallen Chan's National Provider Identifier (NPI) is 1043287857, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Wallen Chan's specialty?
- Wallen Chan is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Wallen Chan located?
- Wallen Chan's practice location on file with NPPES is 78 Todt Hill Rd, Staten Island, NY 10314-4528.
- What is Wallen Chan's phone number?
- The practice phone number listed in the NPPES registry for Wallen Chan is (718) 448-1122.
- Does Wallen Chan accept Medicare?
- Wallen Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Wallen Chan's NPI active?
- Yes — Wallen Chan's NPI (1043287857) is active in the NPPES registry as of the last update on 2008-04-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.