Lyssa Atwell
Lyssa Atwell is a Critical Care Medicine Nurse Practitioner in Saint Louis, MO, registered under NPI 1609716463. This provider registers 4 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 660 S EUCLID AVE, Saint Louis, MO 63110. 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 |
|---|---|---|
| 2026008972 | MO | Critical Care Medicine Nurse Practitioner primary |
| 2026008972 | MO | Acute Care Nurse Practitioner |
| 2026008972 | MO | Adult Health Nurse Practitioner |
| 2026008972 | MO | Gerontology Nurse Practitioner |
This provider holds licence 2026008972 issued in MO. 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 Critical Care Medicine covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LC0200X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 363LC0200X | Critical Care Medicine Nurse Practitioner Critical Care Medicine | 2026008972 | MO | primary |
| 363LA2100X | Acute Care Nurse Practitioner Acute Care | 2026008972 | MO | |
| 363LA2200X | Adult Health Nurse Practitioner Adult Health | 2026008972 | MO | |
| 363LG0600X | Gerontology Nurse Practitioner Gerontology | 2026008972 | MO |
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 | 1609716463 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 31, 2026 |
| Last updated | Mar 31, 2026 |
| Status | Active |
| Sole proprietor | No |
| Practice address |
660 S EUCLID AVE Saint Louis, MO 63110 (314) 273-0500 |
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 | 0 | 9 | 7 | 1 | 6 | 4 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 0 | 9 | 5 | 1 | 3 | 4 | 3 |
Sum = 57 · next multiple of 10 = 60 · 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.