Doctor profile · Federal record
Dr. Mark Williams, MD
Hospitalist Physician · Internal Medicine Physician · Saint Louis, MO
- NPI 1962425819
- MIPS 79.3 / 100 · 2023
- 20 yrs on file
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1 Barnes Jewish Hospital Plz, Div Im Hospitalist
Saint Louis, MO 631101003
(314) 362-1700
fax (314) 362-9878 - Mailing address
-
Po Box 7412011
Chicago, IL 606742011
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- April 17, 2025
- Specialty taxonomy
- 208M00000X — NUCC code
- State license (1)
- Missouri #2021045476
- Medicaid
- MO #200104623
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1962425819. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
109
Distinct HCPCS
2
Medicare allowed
$9,701
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 80 | 23 | $78 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 29 | 14 | $118 |
In context: peer comparison
Among 109 peers in this city , average services per provider: 96. This provider delivers 1.1× the peer median.Frequently asked questions
What is Dr. Mark Williams's medical specialty?
Dr. Mark Williams practices Hospitalist Physician in Saint Louis, MO.
Where does Dr. Mark Williams practice?
Dr. Mark Williams practices at 1 Barnes Jewish Hospital Plz, Saint Louis, MO 631101003. Office phone: 3143621700.
What is Dr. Mark Williams's NPI?
Dr. Mark Williams's National Provider Identifier (NPI) is 1962425819, issued by NPPES.
What procedures does Dr. Mark Williams commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233). Source: CMS Medicare Physician & Other Practitioners file.