Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Carol Marie Leffler, MA CCC SLP

Speech-Language Pathologist in West Chicago, IL · enumerated 2018.

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

National Provider Identifier

1043794779

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Mrs. Carol Marie Leffler

Credential MA CCC SLP

Sex Female

Practice address 29 W 648 Trinity Lane, West Chicago, IL, 60185

Phone (630) 661-7970

Enumeration date Sep 19, 2018

Last updated in NPPES Sep 19, 2018

Taxonomy & licenses

235Z00000X Speech-Language Pathologist Speech, Language and Hearing Service Providers · License 146.001030 (IL) Primary

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 this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Carol Leffler?

Carol Leffler is registered in NPPES with the primary taxonomy of Speech-Language Pathologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-09-19.