CHUN-YANG MICHAEL CHANG (MD) – Gastroenterology Physician, NPI 1033106034
Gastroenterology Physician
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Profile Insights
NPPES metrics only — not quality of care.
252 GASTROENTEROLOGY in OR
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Provider Addresses for CHUN-YANG MICHAEL CHANG (MD)
Cascadia Behavioral Healthcare Administrative Office, 847, Northeast 19th Avenue, Kerns, Portland, Metro, Multnomah County, Oregon, 97232, United States
SUITE 300
PORTLAND, OR 972322684
Phone: (503) 963-2801
Fax: (503) 963-2825
Type: Mailing
1508, Division Street, Oregon City, Metro, Clackamas County, Oregon, 97045, United States
STE 15
OREGON CITY, OR 970451582
Phone: (503) 692-3750
Fax: (503) 691-2324
Type: Location
19250 SW 90th Ave
Tualatin, OR 970627585
Phone: (503) 692-3750
Fax: (503) 691-2324
Type: Location
541 NE 20TH AVE STE 225
PORTLAND, OR 972322895
Phone: (503) 963-2801
Fax: (503) 963-2825
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 $57.
Total Amount is formed as General ($57) + Research ($0) + Ownership ($0) = $57.
Last reported payment date: 2024-12-12 • Largest payer in this snapshot: Janssen Biotech, Inc. ($32).
Total Amount
$57
General + Research + Ownership
Payments
2
Total payment records
General Amount
$57
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-12
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Janssen Biotech, Inc. | $32 |
| ABBVIE INC. | $25 |
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: 2010-08-20
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
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 |
|---|---|---|---|---|
| I20100820000313 | I | Gastroenterology | OR | 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 | 108 | 66 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 54 | 54 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 34 | 30 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 32 | 27 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 23 | 23 | $0 |
Insurance plans in this area (ZIP 97232)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | OR | 45385 | Removal of polyps or growths of large bowel using an endoscope | 45 | 45 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Pulmonary Disease | OR | |
| - | OR | |
| O T O L A R Y N G O L O G Y | OR | |
| Internal Medicine, Gastroenterology | OR | |
| Gastroenterology, Internal Medicine | OR | |
| G A S T R O E N T E R O L O G Y | OR | |
| U R O L O G Y | OR | |
| Physician Assistant | OR | |
| - | OR | |
| - | OR |
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