John Zahour, MD
John Zahour, MD is an Ophthalmology Physician in Chicago, IL, registered under NPI 1992381446. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 5841 S MARYLAND AVE, Chicago, IL 60637. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 036.169905 | IL | Ophthalmology Physician primary |
| 125078526 | IL | Internal Medicine Physician |
| 125078526 | IL | Ophthalmology Physician |
This provider holds licence 036.169905 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
- Order And Referring Only - Ophthalmology
- PAC ID
- 4486038650
- Enrollment ID
- I20220907002669
Medicare enrolment is recorded as approved under the provider type Order And Referring Only - Ophthalmology. 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 Ophthalmology covers
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses. NUCC Health Care Provider Taxonomy, code 207W00000X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207W00000X | Ophthalmology Physician | 036.169905 | IL | primary |
| 207R00000X | Internal Medicine Physician | 125078526 | IL | |
| 207W00000X | Ophthalmology Physician | 125078526 | IL |
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 | 1992381446 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 23, 2021 |
| Last updated | May 22, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
5841 S MARYLAND AVE Chicago, IL 60637 (773) 702-3937 |
| Mailing address |
180 HARVESTER DR. STE 110 Burr Ridge, IL 60527 |
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 | 9 | 9 | 2 | 3 | 8 | 1 | 4 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 9 | 2 | 6 | 8 | 2 | 4 | 8 |
Sum = 74 · next multiple of 10 = 80 · 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.