ALAN G.Y. CHANG (M.D.) – Gastroenterology Physician, NPI 1255398285
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
474 GASTROENTEROLOGY in WA
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Provider Addresses for ALAN G.Y. CHANG (M.D.)
Squalicum Parkway, Parkview, Bellingham, Whatcom County, Washington, 98225-2698, United States
SUITE 301
BELLINGHAM, WA 982251811
Phone: (360) 734-1420
Fax: (360) 756-6666
Type: Mailing
1342 NE Medical Center Dr Ste 100
Bend, OR 977015918
Phone: (541) 706-5777
Fax: (541) 429-6642
Type: Location
3111 WOBURN ST STE 201
BELLINGHAM, WA 982266610
Phone: (360) 543-5054
Fax: (360) 733-1659
Type: Mailing
PO BOX 1517
PENDLETON, OR 978010410
Phone: (877) 708-1119
Fax: (541) 278-8349
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 2 Open Payments records for all available years, with a total value of $40.
Total Amount is formed as General ($40) + Research ($0) + Ownership ($0) = $40.
Last reported payment date: 2024-01-31 • Largest payer in this snapshot: ABBVIE INC. ($25).
Total Amount
$40
General + Research + Ownership
Payments
2
Total payment records
General Amount
$40
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-01-31
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ABBVIE INC. | $25 |
| Salix Pharmaceuticals, a division of Bausch Health US, LLC | $15 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2021-06-03
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 3 Medicare enrollment records; no due dates published yet.
Enrollment records
3
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20100923001467 | I | Gastroenterology | WA | TBD |
| I20201109000663 | I | Gastroenterology | MT | TBD |
| I20210603001051 | I | Gastroenterology | WI | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 88305 | Pathology examination of tissue using a microscope, intermediate complexity | 153 | 71 | $0 |
| 45380 | Biopsy of large bowel using a flexible endoscope | 117 | 117 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 90 | 90 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 43 | 43 | $0 |
| G0500 | Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito | 14 | 14 | $0 |
Insurance plans in this area (ZIP 98225)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Family Practice | WI | |
| Nurse Practitioner | WI | |
| - | WI | |
| Internal Medicine, Infectious Disease | NY | |
| - | WI | |
| Family Practice | WI | |
| Nurse Practitioner | WV | |
| Internal Medicine | WI | |
| Nurse Practitioner | IL | |
| - | WI |
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