ESTHER HSUAN-HSIN CHANG (M.D.) – Obstetrics & Gynecology Physician, NPI 1699764274
Obstetrics & Gynecology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
4,008 OBSTETRICS/GYNECOLOGY in CA
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Provider Addresses for ESTHER HSUAN-HSIN CHANG (M.D.)
1520, Stockton Street, North Beach, San Francisco, California, 94133, United States
SAN FRANCISCO, CA 941333354
Phone: (415) 391-9686
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 22 Open Payments records for all available years, with a total value of $712.
Total Amount is formed as General ($712) + Research ($0) + Ownership ($0) = $712.
Last reported payment date: 2024-12-09 • Largest payer in this snapshot: Merck Sharp & Dohme LLC ($233).
Total Amount
$712
General + Research + Ownership
Payments
22
Total payment records
General Amount
$712
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-09
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: 2012-11-02
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 |
|---|---|---|---|---|
| I20121102000263 | I | Obstetrics/Gynecology | 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.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 94133)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| R H E U M A T O L O G Y | NC | |
| Geriatric Medicine, Internal Medicine | CA | |
| Internal Medicine | CA | |
| Family Practice | CA | |
| Hospitalist, Obstetrics/Gynecology | CA | |
| Family Practice | CA | |
| Family Practice | CA | |
| Internal Medicine | CA | |
| Physician Assistant | CA | |
| - | CA |
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