Doctor profile · Federal record
Dr. William Dierenfeldt, MD
Gastroenterology Physician (CMS: Gastroenterology) · Manhattan, KS
- NPI 1477591634
- Accepts Medicare
- 32 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
1325 Research Park Dr
Manhattan, KS 665025000
(785) 537-2651 - Additional location
-
1102 Saint Marys RD
Junction City, KS 664414139
(785) 238-0325
fax (785) 576-1113
Credentials & registration
- NPI registered
- June 2006 — 20 yrs on file
- Profile last updated
- January 5, 2026
- Year of graduation
- 1994 — 32 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Kansas #04-28673
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1477591634. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,038
Distinct HCPCS
10
Medicare allowed
$152,294
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 263 | 260 | $230 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 252 | 241 | $71 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 120 | 120 | $169 | |
43249 |
Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm | 104 | 77 | $126 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 90 | 90 | $124 | |
G0121 |
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | 57 | 57 | $172 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 45 | 45 | $165 | |
43235 |
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 34 | 33 | $95 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 26 | 24 | $85 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 16 | 16 | $105 |
In context: peer comparison
Among 2 peers in Manhattan Gastroenterology Physician, average services per provider: 65. This provider delivers 16× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
749
Patients
138
Total drug cost
$34,414
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 397 | 93 | $5,740 |
| Omeprazole | Generic | 103 | 32 | $1,340 |
| Famotidine | Generic | 38 | 0 | $293 |
| Nortriptyline Hcl | Generic | 36 | 0 | $276 |
| Dicyclomine Hcl | Generic | 25 | 0 | $699 |
| Budesonide Dr (Budesonide) | Brand | 24 | 0 | $5,473 |
| Sucralfate | Generic | 21 | 0 | $998 |
| Ondansetron Hcl | Generic | 17 | 0 | $477 |
| Gavilyte-G (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 14 | 13 | $239 |
| Azathioprine | Generic | 13 | 0 | $2,048 |
Frequently asked questions
What is Dr. William Dierenfeldt's medical specialty?
Dr. William Dierenfeldt practices Gastroenterology Physician in Manhattan, KS.
Where does Dr. William Dierenfeldt practice?
Dr. William Dierenfeldt practices at 1325 Research Park Dr, Manhattan, KS 665025000. Office phone: 7855372651.
What is Dr. William Dierenfeldt's NPI?
Dr. William Dierenfeldt's National Provider Identifier (NPI) is 1477591634, issued by NPPES.
Does Dr. William Dierenfeldt accept Medicare assignment?
Yes. Dr. William Dierenfeldt accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Dierenfeldt commonly perform?
Top Medicare-reported procedures in 2023: Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385); Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239); Colorectal cancer screening; colonoscopy on individual at high risk (HCPCS G0105). Source: CMS Medicare Physician & Other Practitioners file.