Erin Weslander, PHARMD
Erin Weslander, PHARMD is an Infectious Diseases Pharmacist in Chicago, IL, registered under NPI 1205763836. 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 251 E HURON ST, Chicago, IL 60611. 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 |
|---|---|---|
| IND-930083 | IL | Infectious Diseases Pharmacist primary |
| 051.304647 | IL | Pharmacist |
This provider holds licence IND-930083 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 Infectious Diseases covers
A licensed pharmacist who has demonstrated specialized knowledge and skill in the use of microbiology and pharmacology to develop, implement, and monitor drug regimens that incorporate antimicrobials to optimize therapy for patients. NUCC Health Care Provider Taxonomy, code 1835I0206X
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 | |
|---|---|---|---|---|
| 1835I0206X | Infectious Diseases Pharmacist Infectious Diseases | IND-930083 | IL | primary |
| 183500000X | Pharmacist | 051.304647 | 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 | 1205763836 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 7, 2026 |
| Last updated | May 7, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | PHARMD |
| Practice address |
251 E HURON ST Chicago, IL 60611 (320) 293-7597 |
| Mailing address |
235 W VAN BUREN ST UNIT 2205 Chicago, IL 60607 |
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 | 2 | 0 | 5 | 7 | 6 | 3 | 8 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 0 | 5 | 5 | 6 | 6 | 8 | 6 |
Sum = 64 · next multiple of 10 = 70 · check digit = 6 · actual last digit = 6
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.