Internal Medicine, Infectious Disease · Vacaville, CA
NPI
1073704326
Since 2007
Specialty
Internal Medicine, Infectious Disease
Code 207RI0200X
Group practices
2
Medicare group memberships
Hospitals
2
Hospital affiliations
1010 Nut Tree Rd, Suite 100b
Vacaville, CA, 95687
Phone (707) 624-7999
Groups this clinician bills Medicare through
Medicare paid, 2024
$109K
1,593 services
Medicare patients, 2024
317
Average age 71
Drug cost, 2024
$1.2M
836 prescriptions
Company payments, 2025
$121
From 3 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by Gregory Y Warner was code 99232 (hospital e&m - subsequent), 510 times for 173 patients. In total Gregory Y Warner billed 1,593 services in 12 codes, and Medicare paid $109K.
| Code |
|---|
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2013-09-17.
| Setting |
|---|
| Services |
|---|
| Patients |
|---|
| Paid per service |
|---|
| Medicare paid |
|---|
| 99232 Hospital E&M - Subsequent | Facility | 510 | 173 | $66.04 | $34K |
| 99223 Hospital E&M - Initial | Facility | 249 | 226 | $145.10 | $36K |
| 99215 Office E&M - Established | Office | 182 | 105 | $145.63 | $27K |
| 99205 Office E&M - New | Office | 24 | 24 | $178.29 | $4,279 |
By year: 2022 $112K for 974 services; 2023 $104K for 957 services; 2024 $109K for 1,593 services.
Medicare prescription drug claims, 2024
In 2024, the drug Gregory Y Warner prescribed most often to Medicare patients was Biktarvy (Bictegrav/Emtricit/Tenofov Ala), with 82 prescriptions and refills. In total Gregory Y Warner wrote 836 Medicare prescriptions that cost $1.2M.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Biktarvy Bictegrav/Emtricit/Tenofov Ala | 82 | 91 | Under 11 | $369K |
| Cephalexin Generic | 48 | 91 | 13 | $638 |
| Daptomycin Generic | 45 | 45 | 11 | $21K |
| Fosfomycin Tromethamine Generic | 41 | 75 | Under 11 | $21K |
| Doxycycline Hyclate Generic | 35 | 59 | 13 | $613 |
| Cefpodoxime Proxetil Generic | 33 | 41 | Under 11 | $6,736 |
| Tivicay Dolutegravir Sodium | 33 | 43 | Under 11 | $118K |
| Ertapenem Ertapenem Sodium | 31 | 31 | Under 11 | $9,315 |
| Doxycycline Monohydrate Generic | 25 | 44 | Under 11 | $1,456 |
| Isentress Raltegravir Potassium | 25 | 25 | Under 11 | $58K |
| Odefsey Emtricitab/Rilpiviri/Tenof Ala | 24 | 24 | Under 11 | $83K |
| Fluconazole Generic | 23 | 41 | Under 11 | $1,012 |
| Triumeq Abacavir/Dolutegravir/Lamivudi | 23 | 29 | Under 11 | $105K |
| Descovy Emtricitabine/Tenofov Alafenam | 20 | 30 | Under 11 | $66K |
| Valacyclovir Valacyclovir Hcl | 19 | 30 | Under 11 | $464 |
Brand drugs: 277 claims; generic drugs: 559 claims.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid Gregory Y Warner $121 ($121 in general payments such as food, travel and fees) from 3 companies. The largest payer was Abbvie Inc. with $79.27.
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.