Doctor profile · Federal record
Dr. Don Williams, MD
Internal Medicine Physician (CMS: Internal Medicine) · Oak Park, IL
- NPI 1447288287
- Accepts Medicare
- MIPS 91.4 / 100 · 2023
- 40 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1100 Lake St Ste 230
Oak Park, IL 603011095
(331) 221-9001
fax (331) 221-2759 - Mailing address
-
4201 Winfield RD Fl 4
Warrenville, IL 605554025
Credentials & registration
- NPI registered
- June 2006 — 20 yrs on file
- Profile last updated
- May 19, 2022
- Year of graduation
- 1986 — 40 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Illinois #036081395
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1447288287. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
509
Distinct HCPCS
7
Medicare allowed
$60,705
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 239 | 126 | $135 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 109 | 109 | $137 | |
G0008 |
Administration of influenza virus vaccine | 58 | 56 | $30 | |
90662 |
Influenza vaccine split virus, preservative free | 55 | 53 | $72 | |
90677 |
Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use | 18 | 18 | $282 | |
G0009 |
Administration of pneumococcal vaccine | 18 | 18 | $32 | |
G0438 |
Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit | 12 | 12 | $176 |
In context: peer comparison
Among 19 peers in Oak Park Internal Medicine Physician, average services per provider: 82. This provider delivers 6.2× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
1,984
Patients
566
Total drug cost
$28,369
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 321 | 103 | $4,359 |
| Alprazolam | Generic | 184 | 40 | $1,800 |
| Pantoprazole Sodium | Generic | 149 | 38 | $2,125 |
| Lisinopril | Generic | 133 | 39 | $1,024 |
| Gabapentin | Generic | 129 | 36 | $2,207 |
| Metoprolol Succinate | Generic | 122 | 35 | $2,818 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 121 | 27 | $3,165 |
| Metformin Hcl | Generic | 120 | 39 | $1,006 |
| Rosuvastatin Calcium | Generic | 118 | 35 | $1,879 |
| Levothyroxine Sodium | Generic | 110 | 30 | $2,062 |
Frequently asked questions
What is Dr. Don Williams's medical specialty?
Dr. Don Williams practices Internal Medicine Physician in Oak Park, IL.
Where does Dr. Don Williams practice?
Dr. Don Williams practices at 1100 Lake St Ste 230, Oak Park, IL 603011095. Office phone: 3312219001.
What is Dr. Don Williams's NPI?
Dr. Don Williams's National Provider Identifier (NPI) is 1447288287, issued by NPPES.
Does Dr. Don Williams accept Medicare assignment?
Yes. Dr. Don Williams accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Don Williams commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (HCPCS G0439); Administration of influenza virus vaccine (HCPCS G0008). Source: CMS Medicare Physician & Other Practitioners file.