Physician Profile
Unclaimed ProfileAbout LO
Charles Yin-Yat Lo, MD is a healthcare provider in San Francisco, CA specializing in general surgery. Charles is also listed as specializing in surgery. According to Medicare claims data, Charles cared for 132 Medicare patients across 155 services.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (415) 391-9993
- Email not available
Practice Locations
818 JACKSON STREET SUITE 102
San Francisco, CA 94133
Procedures Most Often Billed to Medicare
155 services · 132 patients · 4 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
75 |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
43 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
24 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
13 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other general surgeons in San Francisco 8
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
More connections — 8 related providers in 1 group
Class of 1967 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What is Dr. Lo's specialty?
Dr. Lo is a general surgeon in San Francisco, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “GENERAL SURGERY”.
NPI registry
Where can I find Dr. Lo?
Dr. Lo is listed at 818 JACKSON STREET SUITE 102, San Francisco, CA 94133. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Lo?
The number on file is (415) 391-9993. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Lo's NPI number?
Dr. Lo's National Provider Identifier is 1811978604. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Lo's medical education?
Dr. Lo attended Other, graduating in 1967. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Lo been practicing?
Dr. Lo has 59 years experience. Calculated from a graduation year of 1967, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Lo known for?
According to Medicare billing data, Dr. Lo the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Lo confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Lo. If this is you, claiming it is free.
Guide.md
Is this your profile?
Verify your identity to control how patients — and AI assistants — describe you.
Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.