Dr. Fred H. Williams, MD
Gastroenterology (Gastroenterology Physician)
17298 N Outer 40 Rd Ste 200
Chesterfield, MO 63005
Who else practices at this address →
St. Louis County includes dental (1% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- University of Missouri, Kansas City, School of Medicine (1986)
- Years since graduation
- 40
- In the NPI registry since
- 2005
- Medicare patients seen, 2024
- 131
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 1986Medical school: University of Missouri, Kansas City, School of Medicine
- 2005Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Gastroenterology Physician primary
MO license 118411
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- St Lukes Hospital Chesterfield, MO
Medical groups
- Gateway Gastroenterology Inc (25 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 131
- Services billed
- 195
- Patients’ average age
- 75
| Service | Times | Patients |
|---|---|---|
| Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month | 111 | 15 |
| Pathology examination of tissue using a microscope, intermediate complexity | 101 | 63 |
| Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 64 | 15 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 59 | 59 |
| Colorectal cancer screening; colonoscopy on individual at high risk | 58 | 58 |
| Established patient office or other outpatient visit, 20-29 minutes | 48 | 46 |
| Special stained specimen slides to examine tissue including interpretation and report | 29 | 19 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 25 | 12 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 25 | 24 |
| Biopsy of large bowel using a flexible endoscope | 21 | 21 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Pantoprazole Sodium Other prescribers in Chesterfield, MO | 115 |
| Famotidine Other prescribers in Chesterfield, MO | 57 |
| Sod Sulf-Potass Sulf-Mag Sulf (sodium, potassium,mag sulfates) Other prescribers in Chesterfield, MO | 36 |
| Mesalamine Other prescribers in Chesterfield, MO | 35 |
| Omeprazole Other prescribers in Chesterfield, MO | 30 |
| Colestipol Hcl Other prescribers in Chesterfield, MO | 28 |
| Budesonide Dr (budesonide) Other prescribers in Chesterfield, MO | 20 |
| Linzess (linaclotide) Other prescribers in Chesterfield, MO | 14 |
| Mercaptopurine | 12 |
| Mesalamine Er (mesalamine) Other prescribers in Chesterfield, MO | 12 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Industry-funded research
Named as a principal investigator on 3 industry-funded studies in 2025, from 3 companies. The companies reported $24,454 in research payments for these studies, mostly to the institutions running them.
- Study of DONQ52 in Active Celiac Disease
Chugai Pharmaceutical Co., Ltd. - Caris Biorepository Research Protocol
Caris Mpi, Inc. · Recruiting · NCT01499394 - Mirikizumab LY3074828 pro uc cd - omvoh - ulcerative colitis
Eli Lilly and Company
From CMS Open Payments research payments, where companies name up to five principal investigators per payment. Research payments usually go to hospitals, universities and research sites, not to the investigator personally. A payment is not evidence of wrongdoing.