JENNIFER E HASSLER LLC
JENNIFER E HASSLER LLC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003399700, based in Oak Brook, IL. It is classified under Mental Health Clinic/Center (Including Community Mental Health Center).
Getting there
Here is what surrounds this office in Oak Brook, based on OpenStreetMap data collected Sep 19, 2026. Parking is available about 487 ft away. The nearest transit stop is 0.29 mi away, served by 22nd Street & Enterprise/Jorie. If you arrive early, there is a coffee shop 0.49 mi away.
Getting here and what is nearby
Parking 355 ft ~2 min
Parking 481 ft ~2 min
Parking 487 ft ~2 min
Hotel Residence Inn Oak Brook 753 ft ~3 min
Transit 22nd Street & McDonald 0.21 mi ~5 min
Transit 22nd Street & McDonald 0.23 mi ~5 min
Transit 22nd Street & Enterprise/Jorie 0.29 mi ~6 min
Restaurant Fogo de Chão 0.32 mi ~7 min
Restaurant Gibson's Bar & Steakhouse 0.38 mi ~8 min
Restaurant Pour House 0.48 mi ~10 min
Coffee Starbucks 0.49 mi ~10 min
Hotel Chicago Marriott Oak Brook 0.50 mi ~11 min
1401 West 22nd Street, Oak Brook 60523
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
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 (Including Community Mental Health Center) covers
Definition to come... NUCC Health Care Provider Taxonomy, code 261QM0801X
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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1003399700 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Sep 10, 2018 |
| Last updated | Sep 10, 2018 |
| Status | Active |
| Practice address |
1000 JORIE BLVD STE 48 Oak Brook, IL 60523 (630) 974-6880 Fax (630) 974-6115 |
| Other identifiers |
1487742557
· 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 | 0 | 0 | 3 | 3 | 9 | 9 | 7 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 9 | 9 | 7 | 0 |
Sum = 60 · next multiple of 10 = 60 · check digit = 0 · actual last digit = 0
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.