Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Lesley Ann Toennies, CRNA

Certified Registered Nurse Anesthetist in Chesterfield, MO · enumerated 2016.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1255873121

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Registry record

Entity type Individual (Type 1)

Name Ms. Lesley Ann Toennies

Credential CRNA

Sex Female

Practice address 14532 S Outer 40 Rd Dept of, Chesterfield, MO, 63017

Phone (800) 862-9980

Fax (314) 362-1185

Enumeration date Nov 9, 2016

Last updated in NPPES Jul 30, 2025

Taxonomy & licenses

367500000X Certified Registered Nurse Anesthetist Physician Assistants & Advanced Practice Nursing Providers · License 2017011453 (MO) Primary

CRNA · Certified Registered Nurse Anesthetist: An advanced practice nurse specializing in anesthesia care. About the CRNA credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1255873121 active?

Yes, as of the latest NPPES snapshot, NPI 1255873121 is active (record last updated 2025-07-30).

How do I verify Lesley Toennies's NPI record?

Cross-check NPI 1255873121 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-07-30.