Doctor profile · Federal record
Dr. Ernest Williams, MD
Gastroenterology Physician (CMS: Gastroenterology) · Oxford, MS
- NPI 1588623292
- Accepts Medicare
- MIPS 97.5 / 100 · 2023
- 32 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
1208 Office Park Dr
Oxford, MS 386553597
(662) 234-9888
fax (662) 281-8927 - Additional location
-
200 State Highway 30 W
New Albany, MS 386523112 - Additional location
-
825 W Monroe St
Grenada, MS 389015042 - Mailing address
-
Po Box 381468
Germantown, TN 381831468
Credentials & registration
- NPI registered
- March 2006 — 20 yrs on file
- Profile last updated
- February 16, 2026
- Year of graduation
- 1994 — 32 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Mississippi #17218
- Medicaid
- MS #000124347
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1588623292. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,447
Distinct HCPCS
10
Medicare allowed
$177,909
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 182 | 157 | $83 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 170 | 165 | $113 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 134 | 134 | $234 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 105 | 98 | $118 | |
99490 |
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 84 | 22 | $58 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 81 | 81 | $155 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 76 | 75 | $141 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 72 | 71 | $123 | |
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 | 72 | 16 | $44 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 48 | 35 | $75 |
In context: peer comparison
Among 3 peers in this city , average services per provider: 62. This provider delivers 23× the peer median.Open Payments
Industry payments received
All-time total
$16,442
Transactions
86
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Phathom Pharmaceuticals, Inc. | 19 | $14,921.79 | |
| ABBVIE INC. | 21 | $261.98 | |
| Boston Scientific Corporation | 3 | $234.95 | |
| PFIZER INC. | 11 | $230.19 | |
| GENZYME CORPORATION | 5 | $118.22 | |
| Salix Pharmaceuticals, a division of Bausch Health US, LLC | 6 | $92.12 | |
| Regeneron Healthcare Solutions, Inc. | 3 | $84.86 | |
| Celgene Corporation | 3 | $58.28 | |
| Ardelyx, Inc. | 2 | $57.75 | |
| Gilead Sciences, Inc. | 3 | $56.37 | |
| Daiichi Sankyo Inc. | 2 | $49.02 | |
| Celltrion USA Inc. | 2 | $42.18 | |
| Madrigal Pharmaceuticals | 2 | $41.61 | |
| Takeda Pharmaceuticals U.S.A., Inc. | 2 | $32.62 | |
| Micro-tech Endoscopy USA, Inc. | 2 | $30.04 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
1,651
Patients
758
Total drug cost
$99,827
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 373 | 143 | $5,467 |
| Famotidine | Generic | 197 | 71 | $3,175 |
| Omeprazole | Generic | 147 | 52 | $2,412 |
| Dicyclomine Hcl | Generic | 143 | 61 | $3,696 |
| Gavilyte-G (Peg3350/Sod Sulf,bicarb,cl/Kcl) | Brand | 139 | 136 | $2,319 |
| Sucralfate | Generic | 131 | 49 | $3,396 |
| Glycopyrrolate | Generic | 77 | 33 | $2,824 |
| Linzess (Linaclotide) | Brand | 77 | 27 | $60,653 |
| Cimetidine | Generic | 65 | 20 | $4,854 |
| Ondansetron Odt (Ondansetron) | Brand | 60 | 23 | $1,636 |
Hospital affiliations
Frequently asked questions
What is Dr. Ernest Williams's medical specialty?
Dr. Ernest Williams practices Gastroenterology Physician in Oxford, MS.
Where does Dr. Ernest Williams practice?
Dr. Ernest Williams practices at 1208 Office Park Dr, Oxford, MS 386553597. Office phone: 6622349888.
What is Dr. Ernest Williams's NPI?
Dr. Ernest Williams's National Provider Identifier (NPI) is 1588623292, issued by NPPES.
Does Dr. Ernest Williams accept Medicare assignment?
Yes. Dr. Ernest Williams accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Ernest Williams commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239); Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385). Source: CMS Medicare Physician & Other Practitioners file.