Janet Diaz, LCPC
Janet Diaz, LCPC is a Mental Health Counselor in Chicago, IL, registered under NPI 1003768177. 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 Nov 2, 2026. Parking is available about 947 ft away. The nearest transit stop is 466 ft away, served by California & 42nd Street.
Getting here and what is nearby
Transit California & Pope John Paul II/43rd Street 326 ft ~2 min
Transit California & Pope John Paul II/43rd Street 341 ft ~2 min
Transit California & 42nd Street 466 ft ~2 min
Parking 806 ft ~4 min
Parking 896 ft ~4 min
Parking 947 ft ~4 min
Restaurant D'Nuez 0.23 mi ~5 min
Grocery Supermercado El Guero 0.27 mi ~6 min
4023 South Archer Avenue, Chicago 60632
Convenience La Bodeguita Beto’s Produce 0.40 mi ~8 min
4233 South Albany Avenue, Chicago 60632
Convenience BP Shop 0.44 mi ~9 min
3935 South Archer Avenue, Chicago 60632
Gas station BP 0.44 mi ~9 min
3935 South Archer Avenue, Chicago 60632
Restaurant Subway 0.44 mi ~9 min
Restaurant Naples Pizza 0.44 mi ~9 min
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 |
|---|---|---|
| 180.014525 | IL | Mental Health Counselor primary |
This provider holds licence 180.014525 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 Mental Health covers
Definition to come... NUCC Health Care Provider Taxonomy, code 101YM0800X
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 | 1003768177 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 11, 2026 |
| Last updated | Feb 11, 2026 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | LCPC |
| Practice address |
4240 S FAIRFIELD AVE Chicago, IL 60632 (773) 310-4488 |
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 | 7 | 6 | 8 | 1 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 5 | 6 | 7 | 1 | 5 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
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.