Walter Wai-Yip Chan, M.D.
Gastroenterology Physician · Boston, MA
Walter Wai-Yip Chan, M.D. is a gastroenterology physician with a practice address in Boston, Massachusetts, and NPI 1295875540, issued on Feb 7, 2007. Check the license (Massachusetts 233733, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Walter Wai-Yip Chan
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 233733 MA
Self-reported in NPPES; status is on the state search - Practice location
- 75 Francis St, Boston, MA 02115
- Phone
- (617) 732-6389
- Enumerated
- Feb 7, 2007
- Record last updated
- Apr 16, 2010 (not updated in 16 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100826000011); accepts Medicare assignment
- Medical or professional school
- Washington University School Of Medicine, 2004
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 686 in Massachusetts → Look up another NPI →
Also registered at 75 Francis St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sarah Abbett, M.D.Anesthesiology Physician1902097736
- Christine Abbott, NPAdult Health Nurse Practitioner1851471940
- Muhammad Abd-El-Barr, M.D., PH.D.Neurological Surgery Physician1891922688
- Duaa AbdelhameidStudent in an Organized Health Care Education/Training Program1851852867
Verify Walter Wai-Yip Chan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 233733Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average gastroenterology physician in 2024
382 Medicare Part D claims for 124 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Omeprazole55 claims
- Pantoprazole Sodium32 claims
- Linzess25 claims
- Motegrity25 claims
- Nortriptyline Hcl24 claims
- Famotidine22 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $607.30
5 payments; by number, the most common kind was food and beverage; the largest payer was Medtronic, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Brigham And Womens Physicians Organization IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Walter Wai-Yip Chan among 686 gastroenterology physician records in Massachusetts
Walter Wai-Yip Chan, M.D. is one of 686 gastroenterology physician records with a practice address in Massachusetts. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 51% of them.
- NPI issued2007 · 51% of these records are older, 40% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2004 · median 2004 among the 491 with a school on file
- Record last updated2010 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Massachusetts
There are 686 gastroenterology physician records in Massachusetts.
All 686 in Massachusetts → Every provider in Boston → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Peter Banks, MDBoston, MA 021151235188251
- Martin Carey, MD DSCBoston, MA 021151326004524
- Sonia Friedman, MDBoston, MA 021151841257169
- Norman Grace, MDBoston, MA 021151831156215
- Kunal Jajoo, M.D.Boston, MA 021151336120591
- Linda Lee, MDBoston, MA 021151255315214
- Ramona Lim, M.D.Boston, MA 021151285608240
- Frederick Makrauer, MDBoston, MA 021151174580484
Common questions
What is Walter Wai-Yip Chan, M.D.'s NPI number?
Walter Wai-Yip Chan, M.D.'s National Provider Identifier (NPI) is 1295875540, issued on Feb 7, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Walter Wai-Yip Chan, M.D. located?
The NPPES record lists a practice address at 75 Francis St, Boston, MA, 02115. Phone: (617) 732-6389. Providers update this record themselves, so call before visiting.
How can I verify Walter Wai-Yip Chan, M.D.'s license?
NPPES lists Massachusetts license number 233733, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Walter Wai-Yip Chan, M.D. prescribe under Medicare Part D?
In 2024, Walter Wai-Yip Chan, M.D. had 382 Medicare Part D claims for 124 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.