Mary Gouris, OD
Mary Gouris, OD is a provider specialising in Optometrist in Chicago, IL, registered under NPI 1003358466.
Getting there
Here is what surrounds this office in Chicago, based on OpenStreetMap data collected Sep 21, 2026. Parking is available about 1,012 ft away at Wabash-Randolph Parking Garage. There is EV charging 959 ft from the office (Tesla Supercharger) — useful if you are driving in from out of town. The nearest transit stop is 511 ft away, served by Michigan & Randolph. A pharmacy sits 0.24 mi from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 367 ft away.
Getting here and what is nearby
Restaurant Jimmy John's 45 ft ~1 min
Transit Michigan & South Water 158 ft ~1 min
Restaurant Blackwood BBQ - Illinois Center 246 ft ~1 min
Restaurant Venteux Brasserie 273 ft ~2 min
224 North Michigan Avenue
Coffee Starbucks 325 ft ~2 min
Coffee Nutella Cafe 341 ft ~2 min
Hotel Pendry Chicago 332 ft ~2 min
230 North Michigan Avenue, Chicago 60601
Transit Michigan & South Water 357 ft ~2 min
Coffee Stan's Donuts & Coffee 367 ft ~2 min
Hotel citizenM Chicago 408 ft ~2 min
80 East Wacker Place, Chicago 60601
Hotel Hampton Inn Chicago Downtown/North Loop 501 ft ~2 min
Grocery Bockwinkel's 463 ft ~2 min
222 North Columbus Drive, Chicago 60601
Mo-Su 08:00-23:00
Transit Michigan & Randolph 511 ft ~2 min
Parking Hotel Parking 544 ft ~3 min
57 East South Water Street, 60601
Convenience 7-Eleven 590 ft ~3 min
Parking 60 East Lake Self Park 565 ft ~3 min
60 East Lake Street, Chicago 60601
Convenience 7-Eleven 753 ft ~3 min
EV charging Tesla Supercharger 959 ft ~4 min
Pharmacy CVS Pharmacy 956 ft ~4 min
Parking Wabash-Randolph Parking Garage 1,012 ft ~4 min
20-32 East Randolph Street, Chicago 60601
Pharmacy Walgreens 0.22 mi ~5 min
Pharmacy Walgreens 0.24 mi ~5 min
30 North Michigan Avenue, Chicago 60602
Mo-Fr 07:00-22:00; Sa-Su 08:00-22:00
Grocery Mariano's Fresh Market 0.26 mi ~6 min
Convenience North Loop Market 0.30 mi ~6 min
Mo-Th 07:00-22:00; Fr 07:00-23:00; Sa 08:00-23:00; Su 08:00-22:00
Grocery Whole Foods Market 0.40 mi ~8 min
255 East Grand Avenue, Chicago 60611
Mo-Su 08:00-22:00
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 |
|---|---|---|
| 046011071 | IL | Optometrist primary |
This provider holds licence 046011071 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 - Optometry
- PAC ID
- 9436620390
- Enrollment ID
- I20260602002549
Medicare enrolment is recorded as approved under the provider type Practitioner - Optometry. 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 Optometrist covers
Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system. NUCC Health Care Provider Taxonomy, code 152W00000X
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 | 1003358466 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 15, 2016 |
| Last updated | Nov 15, 2016 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | OD |
| Practice address |
225 N MICHIGAN AVE Chicago, IL 60601 (312) 819-0199 |
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 | 5 | 8 | 4 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 5 | 7 | 4 | 3 |
Sum = 54 · next multiple of 10 = 60 · check digit = 6 · actual last digit = 6
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.