DR. STEPHEN YAN CHUN TO (M.D.) – Diagnostic Radiology Physician, NPI 1932165263
Diagnostic Radiology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
4,793 DIAGNOSTIC RADIOLOGY in CA
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Provider Addresses for DR. STEPHEN YAN CHUN TO (M.D.)
4503, Bowie, Claremont, Los Angeles County, California, 91711, United States
CLAREMONT, CA 917118326
Phone: (909) 626-4814
Type: Mailing
Pomona Valley Hospital Medical Center, 1798, North Garey Avenue, Pomona, Los Angeles County, California, 91767, United States
POMONA, CA 917672918
Phone: (909) 865-9532
Fax: (909) 397-0194
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 1 Open Payments records for all available years, with a total value of $122.
Total Amount is formed as General ($122) + Research ($0) + Ownership ($0) = $122.
Last reported payment date: 2023-10-03 • Largest payer in this snapshot: AngioDynamics, Inc. ($122).
Total Amount
$122
General + Research + Ownership
Payments
1
Total payment records
General Amount
$122
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-10-03
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| AngioDynamics, Inc. | $122 |
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: 2004-01-28
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 |
|---|---|---|---|---|
| I20040128000698 | I | Diagnostic Radiology | 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 |
|---|---|---|---|---|
| 71045 | X-ray of chest, 1 view | 1,039 | 840 | $0 |
| 70450 | Ct scan head or brain without contrast | 456 | 418 | $0 |
| 74177 | Ct scan of abdomen and pelvis with contrast | 186 | 177 | $0 |
| 74018 | X-ray of abdomen, 1 view | 143 | 121 | $0 |
| 72125 | Ct scan of upper spine without contrast | 124 | 121 | $0 |
Insurance plans in this area (ZIP 91711)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| DIAGNOSTIC RADIOLOGY | CA | 71010 | X-ray of chest, 1 view, front | 1264 | 935 |
| DIAGNOSTIC RADIOLOGY | CA | 73110 | X-ray of wrist, minimum of 3 views | 28 | 27 |
| DIAGNOSTIC RADIOLOGY | CA | 73562 | X-ray of knee, 3 views | 30 | 25 |
| DIAGNOSTIC RADIOLOGY | CA | 78452 | Nuclear medicine study of vessels of heart using drugs or exercise multiple studies | 31 | 31 |
| DIAGNOSTIC RADIOLOGY | CA | 93971 | Ultrasound scan of veins of one arm or leg or limited including assessment of compression and functional maneuvers | 50 | 46 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Diagnostic Radiology | CA | |
| Diagnostic Radiology | CA | |
| Diagnostic Radiology | CA | |
| Diagnostic Radiology | IL | |
| Diagnostic Radiology | CA | |
| Diagnostic Radiology | CA | |
| Diagnostic Radiology | CA | |
| - | CA | |
| Diagnostic Radiology | CA | |
| Diagnostic Radiology | TX |
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