NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mrs. Marsha J Ivester

Addiction (Substance Use Disorder) Counselor in St. Louis, MO · enumerated 2012.

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

National Provider Identifier

1801162474

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Mrs. Marsha J Ivester
Sex Female
Practice address St. Louis, MO, 63107
Phone (314) 534-6624
Fax (314) 535-4394
Enumeration date Mar 28, 2012
Last updated in NPPES Dec 22, 2015

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 16090 (MO) Primary
171M00000X Case Manager/Care Coordinator Other Service Providers Secondary

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

What is the NPI number for Marsha Ivester?
The National Provider Identifier (NPI) for Marsha Ivester is 1801162474, a Type 1 (individual) record in the CMS NPPES registry.
Where does Marsha Ivester practice?
The practice location on file with NPPES is in St. Louis, MO. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-12-22.