Alan G.y. Chang, M.D.
Gastroenterology · Internal Medicine (CMS) · Bellingham, WA
At a glance
3111 Woburn St Ste 201, Bellingham, WA 98226-6610
Published activity: Colonoscopy · Upper gastrointestinal (GI) endoscopy for acid reflux. View counts and coverage
NPPES record updated May 24, 2023. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
3111 Woburn St Ste 201Bellingham, WA 98226-6610
Additional reported practice locations
1342 Ne Medical Center Dr Ste 100Bend, OR 977015918
Phone: 5417065777
Fax: 5414296642
Education & affiliations
- Medical / professional school
- University Of Hawaii John A. Burns School Of Medicine
- Graduation year
- 1989
- CMS specialties
- Gastroenterology · Internal Medicine
Practice groups
Reported hospital affiliations
- Aspirus Stevens Point Hospital & Clinics, Inc. Stevens Point, WI
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Colonoscopy | 20 |
| Upper gastrointestinal (GI) endoscopy for acid reflux | 31 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
No matching general-payment summary in the imported release. This is not a verified zero and does not rule out other payment types or years.
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Gastroenterology · Internal Medicine (CMS)
- Taxonomy code
- 207RG0100X
- Enumeration date
- Apr 26, 2006
- Record updated
- May 24, 2023
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- M.D.
Reported taxonomies and licenses
207RG0100X · Primary
License reported: MD00036498 WA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
3111 Woburn St Ste 201Bellingham, WA 98226-6610
- Phone
- (360) 543-5054
- Fax
- (360) 733-1659
Mailing address
3111 WOBURN ST STE 201BELLINGHAM, WA 982266610
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
Report a directory issue