Tessa Butt, PHARMD
Tessa Butt, PHARMD is a Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist in O Fallon, IL, registered under NPI 1962202036.
Getting there
The practice address on file is 1 SAINT ELIZABETH BLVD, O Fallon, IL 62269. 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 |
|---|---|---|
| 051.306598 | IL | Pharmacist Clinician (PhC)/ Clinical… primary |
This provider holds licence 051.306598 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 Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist covers
Pharmacist Clinician/Clinical Pharmacy Specialist is a pharmacist with additional training and an expanded scope of practice that may include prescriptive authority, therapeutic management, and disease management. NUCC Health Care Provider Taxonomy, code 1835P0018X
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 | 1962202036 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 17, 2025 |
| Last updated | Mar 17, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | PHARMD |
| Practice address |
1 SAINT ELIZABETH BLVD O Fallon, IL 62269 (618) 234-2120 |
| Mailing address |
10101 SHAPFIELD LN Saint Louis, MO 63123 |
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 | 6 | 2 | 2 | 0 | 2 | 0 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 3 | 2 | 4 | 0 | 4 | 0 | 6 |
Sum = 54 · next multiple of 10 = 60 · 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.