Internal Medicine, Gastroenterology · Denver, CO
NPI
1952356677
Since 2006
Specialty
Internal Medicine, Gastroenterology
Code 207RG0100X
Group practices
3
Medicare group memberships
Hospitals
3
Hospital affiliations
4500 E 9th Ave Ste 720s
Denver, CO, 80220
Phone (303) 355-3525
Groups this clinician bills Medicare through
Medicare paid, 2024
$31K
246 services
Medicare patients, 2024
167
Average age 73
Drug cost, 2024
$274K
1,044 prescriptions
Company payments, 2025
$1,357
From 18 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by Kevin Sieja was code 45385 (colonoscopy - lesion removal), 47 times for 47 patients. In total Kevin Sieja billed 246 services in 17 codes, and Medicare paid $31K.
| Code |
|---|
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2026-06-30.
| Setting |
|---|
| Services |
|---|
| Patients |
|---|
| Paid per service |
|---|
| Medicare paid |
|---|
| 45385 Colonoscopy - Lesion Removal | Facility | 47 | 47 | $207.66 | $9,760 |
| 99214 Office E&M - Established | Office | 44 | 33 | $101.08 | $4,447 |
| 99204 Office E&M - New | Office | 34 | 34 | $121.81 | $4,142 |
| 43239 Upper GI Endoscopy | Facility | 31 | 31 | $79.59 | $2,467 |
| 45380 Lower GI Endoscopy - Other | Facility | 23 | 23 | $110.21 | $2,535 |
| G0105 Colorectal cancer screening; colonoscopy on individual at high risk | Facility | 20 | 20 | $178.89 | $3,578 |
| G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | Facility | 12 | 12 | $171.52 | $2,058 |
| 99213 Office E&M - Established | Office | 12 | 11 | $42.43 | $509 |
By year: 2022 $48K for 465 services; 2023 $45K for 892 services; 2024 $31K for 246 services.
Medicare prescription drug claims, 2024
In 2024, the drug Kevin Sieja prescribed most often to Medicare patients was Suflave (Peg 3350/Sod Sulf,chlr/Pot/Mag), with 274 prescriptions and refills. In total Kevin Sieja wrote 1,044 Medicare prescriptions that cost $274K.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Suflave Peg 3350/Sod Sulf,chlr/Pot/Mag | 274 | 274 | 269 | $35K |
| Omeprazole Generic | 205 | 418 | 62 | $3,521 |
| Gavilyte-G Peg3350/Sod Sulf,bicarb,cl/Kcl | 88 | 88 | 88 | $1,535 |
| Peg-3350 And Electrolytes Peg3350/Sod Sulf,bicarb,cl/Kcl | 58 | 58 | 57 | $774 |
| Pantoprazole Sodium Generic | 45 | 82 | 12 | $289 |
| Mesalamine Generic | 42 | 70 | Under 11 | $15K |
| Esomeprazole Magnesium Generic | 33 | 82 | Under 11 | $873 |
| Creon Lipase/Protease/Amylase | 28 | 45 | Under 11 | $65K |
| Budesonide Dr Budesonide | 25 | 41 | Under 11 | $4,157 |
| Balsalazide Disodium Generic | 21 | 21 | Under 11 | $2,425 |
| Colesevelam Hcl Generic | 21 | 29 | Under 11 | $1,633 |
| Famotidine Generic | 19 | 35 | Under 11 | $413 |
| Dexlansoprazole Dr Dexlansoprazole | 14 | 32 | Under 11 | $5,250 |
| Motegrity Prucalopride Succinate | 12 | 18 | Under 11 | $9,950 |
| Linzess Linaclotide | 12 | 24 | Under 11 | $13K |
Brand drugs: 448 claims; generic drugs: 596 claims.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid Kevin Sieja $1,357 ($1,357 in general payments such as food, travel and fees) from 18 companies. The largest payer was Abbvie Inc. with $246.
| Company | Payments | Amount |
|---|---|---|
| Abbvie Inc. ABBV | 14 | $246 |
| Takeda Pharmaceuticals U.S.A., Inc. TAK | 6 | $188 |
| Lilly USA, LLC LLY | 7 | $153 |
| Gilead Sciences, Inc. GILD | 5 | $113 |
| Regeneron Healthcare Solutions, Inc. REGN | 5 | $101 |
| Genzyme Corporation SNY | 4 | $100 |
| Ipsen Biopharmaceuticals, Inc IPN.PA | 4 | $95.54 |
| Janssen Biotech, Inc. JNJ | 3 | $72.23 |
| Celltrion USA Inc. 068270.KS | 2 | $65.42 |
| Braintree Laboratories, Inc. | 2 | $49.57 |
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.