Doctor profile · Federal record
Dr. William Kobak, M.D.
Gynecology Physician (CMS: Obstetrics/Gynecology) · Obstetrics & Gynecology Physician · St Charles, IL
- NPI 1023007887
- Accepts Medicare
- MIPS 71.4 / 100 · 2023
- 37 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
3310 W Main St, Suite 200
St Charles, IL 601751000
(630) 897-6044
fax (630) 897-0180 - Mailing address
-
Po Box 657
St Charles, IL 601740657
Credentials & registration
- NPI registered
- October 2005 — 21 yrs on file
- Profile last updated
- January 29, 2025
- Year of graduation
- 1989 — 37 yrs since
- Specialty taxonomy
- 207VG0400X — NUCC code
- State license (1)
- Illinois #036091917
- Medicaid
- IL #036091917
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1023007887. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
84
Distinct HCPCS
2
Medicare allowed
$5,020
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 58 | 34 | $70 | |
99212 |
Established patient office or other outpatient visit, 10-19 minutes | 26 | 20 | $38 |
In context: peer comparison
Among 1 peers in St Charles Gynecology Physician, average services per provider: 42. This provider delivers 2.0× the peer median.Open Payments
Industry payments received
All-time total
$13
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Boston Scientific Corporation | 1 | $13.18 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
248
Patients
96
Total drug cost
$43,192
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Estradiol | Generic | 61 | 26 | $6,055 |
| Oxybutynin Chloride ER (Oxybutynin Chloride) | Brand | 43 | 14 | $1,284 |
| Myrbetriq (Mirabegron) | Brand | 40 | 12 | $25,550 |
| Solifenacin Succinate | Generic | 39 | 20 | $6,710 |
| Methenamine Hippurate | Generic | 38 | 0 | $3,362 |
| Nitrofurantoin Mono-Macro (Nitrofurantoin Monohyd/M-Cryst) | Brand | 14 | 11 | $196 |
| Oxycodone Hcl | Generic | 13 | 13 | $35 |
Hospital affiliations
Frequently asked questions
What is Dr. William Kobak's medical specialty?
Dr. William Kobak practices Gynecology Physician in St Charles, IL.
Where does Dr. William Kobak practice?
Dr. William Kobak practices at 3310 W Main St, St Charles, IL 601751000. Office phone: 6308976044.
What is Dr. William Kobak's NPI?
Dr. William Kobak's National Provider Identifier (NPI) is 1023007887, issued by NPPES.
Does Dr. William Kobak accept Medicare assignment?
Yes. Dr. William Kobak accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Kobak commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Established patient office or other outpatient visit (HCPCS 99212). Source: CMS Medicare Physician & Other Practitioners file.