JOHN K CHAN (MD) – Gynecologic Oncology Physician, NPI 1962596551
Gynecologic Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
181 GYNECOLOGICAL ONCOLOGY in CA
Provider Addresses for JOHN K CHAN (MD)
751 S Bascom Ave
OB/GYN Dept
San Jose, CA 95128
Phone: (408) 885-5000
Type: Location
325, Distel Circle, Los Altos, Santa Clara County, California, 94022, United States
LOS ALTOS, CA 940221408
Phone: (415) 600-0930
Type: Mailing
Van Ness Avenue, Hayes Valley, San Francisco, California, 94102, United States
SAN FRANCISCO, CA 94109
Phone: (415) 600-0930
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 356 Open Payments records for all available years, with a total value of $613,963.
Total Amount is formed as General ($613,963) + Research ($0) + Ownership ($0) = $613,963.
Last reported payment date: 2024-12-31 • Largest payer in this snapshot: GlaxoSmithKline, LLC. ($195,119).
Total Amount
$613,963
General + Research + Ownership
Payments
356
Total payment records
General Amount
$613,963
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-31
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| GlaxoSmithKline, LLC. | $195,119 |
| AstraZeneca Pharmaceuticals LP | $169,163 |
| Eisai Inc. | $86,223 |
| ABBVIE INC. | $51,885 |
| PFIZER INC. | $34,614 |
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: 2007-03-28
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 |
|---|---|---|---|---|
| I20070328000311 | I | Gynecological Oncology | 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 | 131 | 55 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 113 | 84 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 100 | 77 | $0 |
| 99205 | New patient office or other outpatient visit, 60-74 minutes | 65 | 65 | $0 |
| 58571 | Removal of uterus, tubes, and/or ovaries through abdomen using an endoscope, 250.0 g or less | 14 | 14 | $0 |
Insurance plans in this area (ZIP 95128)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| D E R M A T O L O G Y | CA | |
| A L L E R G Y/ I M M U N O L O G Y | CA | |
| - | CA | |
| Hospitalist, Obstetrics/Gynecology | CA | |
| O B S T E T R I C S/ G Y N E C O L O G Y | OR | |
| - | CA | |
| - | CA | |
| - | CA | |
| - | CA | |
| A N E S T H E S I O L O G Y | CA |
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