Walter Chan, M.D.
NPI 1295875540 · Gastroenterology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Walter Chan, M.D. is a Gastroenterology Physician provider in Boston, MA (NPI 1295875540).
Provider details
- NPI number
- 1295875540
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 233733 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
860 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) |
|---|---|---|
| Measurement of Hydrogen in Breath to Test for Stomach and Bowel Symptoms91065 | 194 | $10 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 143 | $101 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 96 | $135 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 82 | $82 |
| Study of Esophagus to Assess Movement91010 | 39 | $67 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 55 | 23 |
| Pantoprazole Sodium | 32 | 14 |
| Prucalopride Succinatebrand: Motegrity | 25 | — |
| Linaclotidebrand: Linzess | 25 | 11 |
| Nortriptyline Hcl | 24 | — |
| Famotidine | 22 | 12 |
| Gabapentin | 17 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$607 across 5 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
- 2007-02-07
- Last updated
- 2010-04-16
Frequently asked questions
- What is Walter Chan's NPI number?
- Walter Chan's National Provider Identifier (NPI) is 1295875540, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Walter Chan's specialty?
- Walter Chan is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Walter Chan located?
- Walter Chan's practice location on file with NPPES is 75 Francis St, Boston, MA 02115-6110.
- What is Walter Chan's phone number?
- The practice phone number listed in the NPPES registry for Walter Chan is (617) 732-6389.
- Does Walter Chan accept Medicare?
- Walter Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Walter Chan's NPI active?
- Yes — Walter Chan's NPI (1295875540) is active in the NPPES registry as of the last update on 2010-04-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.