DR. WILLIAM WEIMING CHANG (D.O.) – Pulmonary Disease Physician, NPI 1417902149
Pulmonary Disease Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,780 PULMONARY DISEASE in CA
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Provider Addresses for DR. WILLIAM WEIMING CHANG (D.O.)
Orange Post Office, 222-224, Summer Street, Warrendine, Orange, New South Wales, 2800, Australia
ORANGE, CA 928637087
Phone: (714) 571-5000
Fax: (714) 571-5055
Type: Mailing
30230, Rancho Viejo Road, San Juan Capistrano, Orange County, California, 92675, United States
SUITE 200
SAN JUAN CAPISTRANO, CA 926751557
Phone: (714) 571-5000
Fax: (714) 571-5055
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 210 Open Payments records for all available years, with a total value of $4,415.
Total Amount is formed as General ($4,415) + Research ($0) + Ownership ($0) = $4,415.
Last reported payment date: 2024-12-17 • Largest payer in this snapshot: GlaxoSmithKline, LLC. ($1,017).
Total Amount
$4,415
General + Research + Ownership
Payments
210
Total payment records
General Amount
$4,415
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-17
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2007-05-10
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 |
|---|---|---|---|---|
| I20070510000320 | I | Pulmonary Disease | CA | 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 |
|---|---|---|---|---|
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 1,090 | 400 | $0 |
| 99451 | Telephone, internet, or electronic health record assessment and management with written report by consulting physician, at least 5 minutes | 767 | 358 | $0 |
| 99443 | Telephone medical discussion with physician, 21-30 minutes | 339 | 157 | $0 |
| 94729 | Test to examine how well the lungs exchange gases | 274 | 248 | $0 |
| 94060 | Test to measure expiratory airflow and volume changes before and after medication administration | 268 | 242 | $0 |
Insurance plans in this area (ZIP 92863)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Pulmonary Disease, Critical Care (Intensivists), Internal Medicine, Sleep Medicine | CA | |
| Pulmonary Disease, Critical Care (Intensivists), Internal Medicine | CA | |
| Family Practice | CA | |
| Nurse Practitioner | CA | |
| Pulmonary Disease, Critical Care (Intensivists), Internal Medicine | CA | |
| Pulmonary Disease, Critical Care (Intensivists), Sleep Medicine | MA | |
| Pulmonary Disease, Critical Care (Intensivists), Internal Medicine | CA | |
| Internal Medicine | CA | |
| Internal Medicine | CA | |
| Hospitalist, Pulmonary Disease, Critical Care (Intensivists), Internal Medicine | CA |
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