Internal Medicine, Gastroenterology · Springfield, IL
NPI
1174623854
Since 2006
Specialty
Internal Medicine, Gastroenterology
Code 207RG0100X
Group practices
1
Medicare group memberships
Hospitals
5
Hospital affiliations
1025 S 6th St
Springfield, IL, 62703
Phone (217) 528-7541
Groups this clinician bills Medicare through
Medicare paid, 2024
$252K
8,479 services
Medicare patients, 2024
644
Average age 74
Drug cost, 2024
$2.2M
4,457 prescriptions
Company payments, 2025
$2,333
From 9 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by William L Peterson was code 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), 253 times for 217 patients. In total William L Peterson billed 8,479 services in 61 codes, and Medicare paid $252K.
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2020-05-21.
| Code | Setting | Services | Patients | Paid per service | Medicare paid |
|---|---|---|---|---|---|
| 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 | 253 | 217 | $12.04 | $3,045 |
| 99214 Office E&M - Established | Office | 247 | 209 | $89.56 | $22K |
| 43239 Upper GI Endoscopy | Facility | 242 | 236 | $56.30 | $14K |
| 36415 Venipuncture Blood Collection | Office | 232 | 157 | $8.17 | $1,895 |
| 45385 Colonoscopy - Lesion Removal | Facility | 128 | 126 | $211.18 | $27K |
| 45380 Lower GI Endoscopy - Other | Facility | 90 | 90 | $102.71 | $9,243 |
| 43450 Digestive/Gastrointestinal | Facility | 74 | 72 | $29.62 | $2,192 |
| 99223 Hospital E&M - Initial | Facility | 68 | 64 | $127.71 | $8,684 |
| 99232 Hospital E&M - Subsequent | Facility | 61 | 41 | $62.51 | $3,813 |
| G0105 Colorectal cancer screening; colonoscopy on individual at high risk | Facility | 54 | 54 | $179.18 | $9,676 |
| 99213 Office E&M - Established | Office | 51 | 51 | $67.43 | $3,439 |
| 43249 Upper GI Endoscopy | Facility | 49 | 47 | $86.08 | $4,218 |
| 99233 Hospital E&M - Subsequent | Facility | 40 | 26 | $86.43 | $3,457 |
| 43264 Upper GI Endoscopy | Facility | 21 | 14 | $68.86 | $1,446 |
| 99204 Office E&M - New | Office | 20 | 20 | $91.22 | $1,824 |
By year: 2022 $149K for 1,550 services; 2023 $198K for 3,741 services; 2024 $252K for 8,479 services.
Lab tests billed to Medicare, 2024
| Test code | Tests | Patients | Paid per test | Medicare paid |
|---|---|---|---|---|
| 36415 Venipuncture Blood Collection | 232 | 157 | $8.17 | $1,895 |
| 85025 Blood Count | 17 | 12 | $7.61 | $129 |
Medicare prescription drug claims, 2024
In 2024, the drug William L Peterson prescribed most often to Medicare patients was Pantoprazole Sodium, with 929 prescriptions and refills. In total William L Peterson wrote 4,457 Medicare prescriptions that cost $2.2M.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Pantoprazole Sodium Generic | 929 | 2,170 | 270 | $12K |
| Famotidine Generic | 620 | 1,588 | 209 | $6,317 |
| Omeprazole Generic | 335 | 878 | 103 | $4,324 |
| Mesalamine Generic | 226 | 472 | 52 | $145K |
| Dicyclomine Hcl Generic | 181 | 269 | 63 | $5,759 |
| Diphenoxylate-Atropine Diphenoxylate Hcl/Atropine | 156 | 181 | 51 | $6,441 |
| Mesalamine Er Mesalamine | 136 | 270 | 34 | $65K |
| Sod Sulf-Potass Sulf-Mag Sulf Sodium, Potassium,mag Sulfates | 128 | 128 | 126 | $8,256 |
| Ondansetron Odt Ondansetron | 119 | 123 | 62 | $1,683 |
| Sulfasalazine Generic | 118 | 274 | 31 | $3,846 |
| Sucralfate Generic | 110 | 170 | 42 | $8,103 |
| Budesonide Dr Budesonide | 108 | 182 | 30 | $18K |
| Prednisone Generic | 95 | 118 | 48 | $796 |
| Balsalazide Disodium Generic | 81 | 174 | 23 | $17K |
| Esomeprazole Magnesium Generic | 76 | 159 | 18 | $3,659 |
Brand drugs: 556 claims; generic drugs: 3,901 claims; opioid claims: 27.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid William L Peterson $2,333 ($2,333 in general payments such as food, travel and fees) from 9 companies. The largest payer was Abbvie Inc. with $590.
| Company | Payments | Amount |
|---|---|---|
| Abbvie Inc. ABBV | 28 | $590 |
| Madrigal Pharmaceuticals MDGL | 4 | $558 |
| Janssen Biotech, Inc. JNJ | 13 | $540 |
| Takeda Pharmaceuticals U.S.A., Inc. TAK | 12 | $232 |
| Boston Scientific Corporation BSX | 1 | $132 |
| Ardelyx, Inc. ARDX | 1 | $122 |
| Genzyme Corporation SNY | 2 | $82.51 |
| Salix Pharmaceuticals, a division of Bausch Health US, LLC BHC | 2 | $39.81 |
| Phathom Pharmaceuticals, Inc. PHAT | 2 | $36.94 |
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.