Doctor profile · Federal record
Dr. Fred Williams, MD
Gastroenterology Physician (CMS: Gastroenterology) · Chesterfield, MO
- NPI 1386644326
- Accepts Medicare
- 40 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
121 Saint Lukes Center Dr, Suite 406
Chesterfield, MO 630173509
(314) 432-5900
fax (314) 434-2679
Credentials & registration
- NPI registered
- July 2005 — 21 yrs on file
- Profile last updated
- April 12, 2017
- Year of graduation
- 1986 — 40 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Missouri #118411
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1386644326. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
594
Distinct HCPCS
10
Medicare allowed
$56,607
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99439 |
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 | $46 | |
88305 |
Pathology examination of tissue using a microscope, intermediate complexity | 101 | 63 | $33 | |
99490 |
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 64 | 15 | $61 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 59 | 59 | $241 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 58 | 58 | $177 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 48 | 46 | $88 | |
88313 |
Special stained specimen slides to examine tissue including interpretation and report | 29 | 19 | $67 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 25 | 24 | $120 | |
99231 |
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 25 | 12 | $48 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 21 | 21 | $100 |
In context: peer comparison
Among 7 peers in this city , average services per provider: 69. This provider delivers 8.6× the peer median.Open Payments
Industry payments received
All-time total
$140
Transactions
2
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Lilly USA, LLC | 1 | $120.97 | |
| IRONWOOD PHARMACEUTICALS, INC | 1 | $19.04 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
715
Patients
278
Total drug cost
$103,846
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 183 | 61 | $3,331 |
| Famotidine | Generic | 87 | 28 | $2,102 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,mag Sulfates) | Brand | 73 | 73 | $5,695 |
| Omeprazole | Generic | 56 | 23 | $1,150 |
| Colestipol Hcl | Generic | 52 | 17 | $6,005 |
| Mesalamine | Generic | 51 | 14 | $45,778 |
| Clenpiq (Sod Picosulf/Mag Ox/Citric Ac) | Brand | 44 | 43 | $7,808 |
| Budesonide Dr (Budesonide) | Brand | 29 | 0 | $2,069 |
| Mesalamine Er (Mesalamine) | Brand | 25 | 0 | $18,510 |
| Cholestyramine (Cholestyramine (With Sugar)) | Brand | 22 | 0 | $1,813 |
Frequently asked questions
What is Dr. Fred Williams's medical specialty?
Dr. Fred Williams practices Gastroenterology Physician in Chesterfield, MO.
Where does Dr. Fred Williams practice?
Dr. Fred Williams practices at 121 Saint Lukes Center Dr, Chesterfield, MO 630173509. Office phone: 3144325900.
What is Dr. Fred Williams's NPI?
Dr. Fred Williams's National Provider Identifier (NPI) is 1386644326, issued by NPPES.
Does Dr. Fred Williams accept Medicare assignment?
Yes. Dr. Fred Williams accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Fred Williams commonly perform?
Top Medicare-reported procedures in 2023: 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 (HCPCS 99439); Pathology examination of tissue using a microscope, intermediate complexity (HCPCS 88305); Chronic care management services (HCPCS 99490). Source: CMS Medicare Physician & Other Practitioners file.