Denise Fleig, APN
Denise Fleig, APN is a Clinical Nurse Specialist in Park Ridge, IL, registered under NPI 1982945903. 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
The practice address on file is 1675 DEMPSTER ST FL 3, Park Ridge, IL 60068. 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 |
|---|---|---|
| 209-004186 | IL | Clinical Nurse Specialist primary |
| 209-004186 | IL | Pediatric Clinical Nurse Specialist |
This provider holds licence 209-004186 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 Clinical Nurse Specialist covers
A registered nurse who, through a graduate degree program in nursing, or through a formal post-basic education program or continuing education courses and clinical experience, is expert in a specialty area of nursing practice within one or more of the components of direct patient/client care, consultation, education, research and administration. NUCC Health Care Provider Taxonomy, code 364S00000X
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 | |
|---|---|---|---|---|
| 364S00000X | Clinical Nurse Specialist | 209-004186 | IL | primary |
| 364SP0200X | Pediatric Clinical Nurse Specialist Pediatrics | 209-004186 | 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 | 1982945903 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 15, 2013 |
| Last updated | Nov 5, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | APN |
| Practice address |
1675 DEMPSTER ST FL 3 Park Ridge, IL 60068 (847) 318-9330 Fax (847) 723-9329 |
| Mailing address |
29373 NETWORK PL Chicago, IL 60673 |
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 | 8 | 2 | 9 | 4 | 5 | 9 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 7 | 2 | 9 | 4 | 1 | 9 | 0 |
Sum = 67 · next multiple of 10 = 70 · check digit = 3 · actual last digit = 3
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.