William Wan, M.D.
William Wan, M.D. is a General Practice Physician in Chicago, IL, registered under NPI 1003043274. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Chicago, based on OpenStreetMap data collected Sep 1, 2026. Parking is available about 0.52 mi away at SP+. The nearest transit stop is 440 ft away, served by Wentworth & Cermak. 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 296 ft away.
Getting here and what is nearby
Transit Wentworth & 23rd Street 58 ft ~1 min
Coffee Oriental Tea House 111 ft ~1 min
2246 South Wentworth Avenue, Chicago 60616
Restaurant Slurp Slurp Noodles 109 ft ~1 min
2247 South Wentworth Avenue, 60616
Su-Tu, Th 10:30-18:30; Fr-Sa 10:30-21:00
Restaurant Gourmet Food Inc 123 ft ~1 min
Transit Wentworth & 23rd Street 165 ft ~1 min
Restaurant Legend Tasty House 135 ft ~1 min
Coffee Hey Tea 230 ft ~1 min
2234 South Wentworth Avenue, Chicago 60616
Coffee Molly Tea 296 ft ~2 min
Pharmacy Peace Pharmacy 345 ft ~2 min
2320 South Wentworth Avenue, Chicago 60616
Transit Wentworth & Cermak 440 ft ~2 min
Parking 432 ft ~2 min
Convenience Happy Market 487 ft ~2 min
2328 South Wentworth Avenue, Chicago 60616
Hotel SpringHill Suites Chicago Chinatown 587 ft ~3 min
Parking 582 ft ~3 min
South Wentworth Avenue, Chicago 60616
Hotel Jaslin Hotel 781 ft ~3 min
Convenience Best Choice Oriental Grocery 835 ft ~4 min
Grocery Silver State City Food Company 1,027 ft ~4 min
Pharmacy Walgreens 0.24 mi ~5 min
Convenience L'Africa L'afrique Market 0.38 mi ~8 min
2001 South State Street, Chicago 60616
Hotel Hilton Garden Inn, Hampton Inn, & Home2 Suites 0.47 mi ~10 min
Grocery Park To Shop Supermarket 0.48 mi ~10 min
Grocery Chicago Oriental Wholesale Market 0.49 mi ~10 min
Parking SP+ 0.52 mi ~11 min
2050 South Indiana Avenue, Chicago 60616
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 |
|---|---|---|
| 19.15068 | IL | Dentist |
| 036.055709 | IL | General Practice Physician primary |
This provider holds licence 19.15068 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 General Practice covers
A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions. NUCC Health Care Provider Taxonomy, code 208D00000X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 122300000X | Dentist | 19.15068 | IL | |
| 208D00000X | General Practice Physician | 036.055709 | 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 | 1003043274 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 16, 2009 |
| Last updated | Jun 16, 2009 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | M.D. |
| Practice address |
2262 S. WENTWORTH AVE 2ND FLOOR Chicago, IL 60616 (312) 791-1013 Fax (312) 791-1444 |
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 | 0 | 4 | 3 | 2 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 4 | 6 | 2 | 5 |
Sum = 46 · next multiple of 10 = 50 · check digit = 4 · actual last digit = 4
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.