William Zander, D.O.
William Zander, D.O. is an Occupational Medicine Physician in Aurora, IL, registered under NPI 1518038488. 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 1221 N HIGHLAND AVE, Aurora, IL 60506. 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 |
|---|---|---|
| 036086818 | IL | Emergency Medicine Physician |
| 036086818 | IL | Occupational Medicine Physician |
| 036-086818 | IL | Occupational Medicine Physician primary |
This provider holds licence 036086818 issued in IL. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Occupational Medicine covers
Occupational medicine focuses on the health of workers, including the ability to perform work; the physical, chemical, biological, and social environments of the workplace; and the health outcomes of environmental exposures. Practitioners in this field address the promotion of health in the work place, and the prevention and management of occupational and environmental injury, illness, and disability. NUCC Health Care Provider Taxonomy, code 2083X0100X
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 | |
|---|---|---|---|---|
| 207P00000X | Emergency Medicine Physician | 036086818 | IL | |
| 2083X0100X | Occupational Medicine Physician Occupational Medicine | 036086818 | IL | |
| 2083X0100X | Occupational Medicine Physician Occupational Medicine | 036-086818 | IL | primary |
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 | 1518038488 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 13, 2006 |
| Last updated | Jul 10, 2026 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | D.O. |
| Practice address |
1221 N HIGHLAND AVE Aurora, IL 60506 (630) 554-3456 Fax (630) 551-2970 |
| Mailing address |
7 WOOD DUCK LN Ottawa, IL 61350 |
| Other identifiers |
036086818
· Medicaid (IL) |
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 | 5 | 1 | 8 | 0 | 3 | 8 | 4 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 2 | 8 | 0 | 3 | 7 | 4 | 7 |
Sum = 62 · next multiple of 10 = 70 · check digit = 8 · actual last digit = 8
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.