DR. CHARLES YIN-YAT LO (MD) – Surgery Physician, NPI 1811978604
Surgery Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
3,317 GENERAL SURGERY in CA
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Provider Addresses for DR. CHARLES YIN-YAT LO (MD)
Medical Dental Building, 890, Jackson Street, Chinatown, San Francisco, California, 94133, United States
SUITE 302
SAN FRANCISCO, CA 941334867
Phone: (415) 391-9993
Fax: (415) 291-9993
Type: Mailing
818 JACKSON ST STE 102
SAN FRANCISCO, CA 941334849
Phone: (415) 391-9993
Fax: (415) 291-9993
Type: Mailing
818 JACKSON STREET
SUITE 102
SAN FRANCISCO, CA 941334849
Phone: (415) 391-9993
Fax: (415) 291-9993
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 3 Open Payments records for all available years, with a total value of $424.
Total Amount is formed as General ($424) + Research ($0) + Ownership ($0) = $424.
Last reported payment date: 2024-05-30 • Largest payer in this snapshot: Stryker Corporation ($173).
Total Amount
$424
General + Research + Ownership
Payments
3
Total payment records
General Amount
$424
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-05-30
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Stryker Corporation | $173 |
| Janssen Pharmaceuticals, Inc | $129 |
| Gilead Sciences, Inc. | $121 |
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: 2004-11-02
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 |
|---|---|---|---|---|
| I20041102000513 | I | General Surgery | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 107 | 68 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 71 | 71 | $0 |
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 26 | 26 | $0 |
| 49505 | Repair of groin hernia (5 years or older) | 12 | 12 | $0 |
| 99222 | Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 12 | 12 | $0 |
Insurance plans in this area (ZIP 94133)
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