William Sadler, PLPC
William Sadler, PLPC is a provider specialising in Substance Abuse Rehabilitation Facility in Abita Springs, LA, registered under NPI 1639046964. 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 21516 HIGHWAY 36, Abita Springs, LA 70420. 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 |
|---|---|---|
| PLC10728 | LA | Substance Abuse Rehabilitation Facility primary |
This provider holds licence PLC10728 issued in LA. 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 Substance Abuse Rehabilitation Facility covers
A facility or distinct part of a facility that provides a 24 hr therapeutically planned living and rehabilitative intervention environment for the treatment of individuals with disorders in the abuse of drugs, alcohol, and other substances. NUCC Health Care Provider Taxonomy, code 324500000X
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 | 1639046964 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Oct 21, 2025 |
| Last updated | Oct 24, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | PLPC |
| Practice address |
21516 HIGHWAY 36 Abita Springs, LA 70420 (504) 677-8463 |
| Mailing address |
3015 ORLEANS AVE New Orleans, LA 70119 |
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 | 6 | 3 | 9 | 0 | 4 | 6 | 9 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 6 | 9 | 0 | 4 | 3 | 9 | 3 |
Sum = 66 · next multiple of 10 = 70 · check digit = 4 · actual last digit = 4
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.