Elizabeth Isak
Elizabeth Isak is an Obstetrics & Gynecology Physician in Chicago, IL, registered under NPI 1003347055.
Getting there
Here is what surrounds this office in Chicago, based on OpenStreetMap data collected Sep 5, 2026. Parking is available about 634 ft away. The nearest transit stop is 498 ft away, served by McClurg & Ontario. A pharmacy sits 0.39 mi from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 869 ft away.
Getting here and what is nearby
Pharmacy Walgreens 56 ft ~1 min
680 North Lake Shore Drive, Chicago 60611
Transit McClurg & Huron 274 ft ~2 min
Parking Northwestern Medical Employee Parking Garage 271 ft ~2 min
401-425 East Erie Street, Chicago 60611
Transit McClurg & Huron 302 ft ~2 min
Restaurant McDonald's 335 ft ~2 min
645 North McClurg Court, Chicago 60611
Mo-Th 05:00-23:00; Fr-Sa 05:00-24:00; Su 05:00-22:00
Hotel The Wade 432 ft ~2 min
Parking 420 ft ~2 min
644 North Lake Shore Drive, Chicago 60611
Transit McClurg & Ontario 498 ft ~2 min
Coffee Starbucks 546 ft ~3 min
Convenience 7-Eleven 602 ft ~3 min
Parking 634 ft ~3 min
441 East Ontario Street, Chicago 60611
Restaurant Buona 655 ft ~3 min
613 North McClurg Court, Chicago 60611
Coffee Harry’s Cafe 796 ft ~4 min
Coffee Jazzman’s Cafe 869 ft ~4 min
303 East Superior Street, Chicago 60611
Restaurant Poke Poké 912 ft ~4 min
355 East Ohio Street, Chicago 60611
Grocery Bockwinkel's 914 ft ~4 min
Hotel Hilton Grand Vacations Club Chicago Magnificent Mile 0.20 mi ~5 min
Hotel DoubleTree Hotel Chicago - Magnificent Mile 0.21 mi ~5 min
Pharmacy Walgreens 0.25 mi ~6 min
Grocery Whole Foods Market 0.28 mi ~6 min
255 East Grand Avenue, Chicago 60611
Mo-Su 08:00-22:00
Convenience 7-Eleven 0.34 mi ~7 min
Pharmacy Walgreens 0.39 mi ~8 min
Grocery Trader Joe's 0.50 mi ~10 min
44 East Ontario Street, Chicago 60611
Mo-Su 08:00-21:00
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 036157790 | IL | Obstetrics & Gynecology Physician primary |
This provider holds licence 036157790 issued in IL. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Obstetrics/gynecology
- PAC ID
- 1254677172
- Enrollment ID
- I20210831003554
Medicare enrolment is recorded as approved under the provider type Practitioner - Obstetrics/gynecology. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Obstetrics & Gynecology covers
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women. NUCC Health Care Provider Taxonomy, code 207V00000X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003347055 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 22, 2017 |
| Last updated | Feb 21, 2022 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Practice address |
680 N LAKE SHORE DR STE 810 Chicago, IL 60611 (312) 926-8811 Fax (312) 926-8855 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 3 | 4 | 7 | 0 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 4 | 5 | 0 | 1 |
Sum = 45 · next multiple of 10 = 50 · check digit = 5 · actual last digit = 5
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.