Internal Medicine, Gastroenterology · San Francisco, CA
NPI
1134177470
Since 2006
Specialty
Internal Medicine, Gastroenterology
Code 207RG0100X
Group practices
5
Medicare group memberships
Hospitals
5
Hospital affiliations
350 Parnassus Ave
San Francisco, CA, 94143
Phone (415) 353-2318
Groups this clinician bills Medicare through
Medicare paid, 2024
$99K
1,238 services
Medicare patients, 2024
326
Average age 71
Drug cost, 2024
$1.4M
1,593 prescriptions
Company payments, 2025
$25K
From 2 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by Francis Y Yao was code 99215 (office e&m - established), 399 times for 205 patients. In total Francis Y Yao billed 1,238 services in 30 codes, and Medicare paid $99K.
| Code |
|---|
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2026-07-13.
| Setting |
|---|
| Services |
|---|
| Patients |
|---|
| Paid per service |
|---|
| Medicare paid |
|---|
| 99215 Office E&M - Established | Facility | 399 | 205 | $120.12 | $48K |
| G2211 Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's | Facility | 353 | 195 | $14.49 | $5,116 |
| 99233 Hospital E&M - Subsequent | Facility | 156 | 53 | $105.24 | $16K |
| 99215 Office E&M - Established | Office | 61 | 35 | $163.05 | $9,946 |
| G2211 Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's | Office | 57 | 37 | $14.57 | $830 |
| 99223 Hospital E&M - Initial | Facility | 32 | 29 | $153.49 | $4,912 |
| G2212 Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or | Facility | 24 | 14 | $25.18 | $604 |
| 99205 Office E&M - New | Facility | 22 | 22 | $143.53 | $3,158 |
| 91200 Standard X-ray | Facility | 14 | 14 | $9.44 | $132 |
By year: 2022 $88K for 785 services; 2023 $94K for 864 services; 2024 $99K for 1,238 services.
Medicare prescription drug claims, 2024
In 2024, the drug Francis Y Yao prescribed most often to Medicare patients was Vemlidy (Tenofovir Alafenamide), with 501 prescriptions and refills. In total Francis Y Yao wrote 1,593 Medicare prescriptions that cost $1.4M.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Vemlidy Tenofovir Alafenamide | 501 | 673 | 62 | $945K |
| Entecavir Generic | 227 | 494 | 52 | $55K |
| Ursodiol Generic | 101 | 256 | 29 | $21K |
| Xifaxan Rifaximin | 66 | 66 | 11 | $214K |
| Azathioprine Generic | 63 | 129 | 12 | $2,456 |
| Prednisone Generic | 58 | 89 | 14 | $299 |
| Atorvastatin Calcium Generic | 49 | 139 | 13 | $601 |
| Omeprazole Generic | 47 | 130 | 16 | $430 |
| Lactulose Generic | 40 | 74 | 13 | $1,522 |
| Pantoprazole Sodium Generic | 39 | 83 | 14 | $691 |
| Tenofovir Disoproxil Fumarate Generic | 35 | 75 | Under 11 | $5,250 |
| Spironolactone Generic | 24 | 57 | Under 11 | $342 |
| Baraclude Entecavir | 22 | 34 | Under 11 | $48K |
| Propranolol Hcl Generic | 21 | 43 | Under 11 | $217 |
| Mirtazapine Generic | 18 | 18 | Under 11 | $54.74 |
Brand drugs: 616 claims; generic drugs: 977 claims.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid Francis Y Yao $25K ($25K in general payments such as food, travel and fees) from 2 companies. The largest payer was Gilead Sciences, Inc. with $13K.
Official US government data on Original Medicare services, Medicare prescription drug plans and the payments drug and device companies must report. Services with fewer than 11 patients and drugs with fewer than 11 claims are not published. Procedure codes are shown by number with their public category.