STEVEN SIWEI YU (MD) – Specialist, NPI 1659643682
Specialist
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,531 HEMATOLOGY/ONCOLOGY in CA
Provider Addresses for STEVEN SIWEI YU (MD)
11180 WARNER AVE STE 351
FOUNTAIN VALLEY, CA 927087516
Phone: (714) 698-0300
Fax: (714) 698-0313
Type: Mailing
3801 Katella Ave Ste 207
Los Alamitos, CA 907203382
Phone: (714) 698-0300
Fax: (714) 698-0303
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 551 Open Payments records for all available years, with a total value of $11,831.
Total Amount is formed as General ($11,831) + Research ($0) + Ownership ($0) = $11,831.
Last reported payment date: 2024-12-26 • Largest payer in this snapshot: Novartis Pharmaceuticals Corporation ($953).
Total Amount
$11,831
General + Research + Ownership
Payments
551
Total payment records
General Amount
$11,831
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-26
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Novartis Pharmaceuticals Corporation | $953 |
| AstraZeneca Pharmaceuticals LP | $906 |
| Janssen Biotech, Inc. | $686 |
| Alexion Pharmaceuticals, Inc. | $495 |
| Eisai Inc. | $359 |
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: 2017-06-13
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 |
|---|---|---|---|---|
| I20170613001153 | I | Hematology/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 | 174 | 61 | $0 |
| 96413 | Administration of chemotherapy into vein, 1 hour or less | 139 | 15 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 122 | 51 | $0 |
| 96367 | Infusion into a vein for therapy, prevention, or diagnosis, additional sequential infusion, 1 hour or less | 90 | 11 | $0 |
| 96372 | Injection of drug or substance under skin or into muscle | 88 | 13 | $0 |
Insurance plans in this area (ZIP 92708)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Gynecological Oncology | CA | |
| Medical Oncology | CA | |
| Hematology/Oncology, Internal Medicine | CA | |
| Nurse Practitioner | CA | |
| Hematology/Oncology, Internal Medicine | CA | |
| H E M A T O L O G Y/ O N C O L O G Y | CA | |
| Gynecological Oncology | PA | |
| Gynecological Oncology, Obstetrics/Gynecology | CA | |
| Internal Medicine | CA | |
| H E M A T O L O G Y/ O N C O L O G Y | CA |
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