NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Victor Arthur Marchlewski III, PLPC

Professional Counselor in Saint Charles, MO · enumerated 2011.

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

National Provider Identifier

1356647077

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Mr. Victor Arthur Marchlewski III
Credential PLPC
Sex Male
Practice address 2850 W Clay St, Suite 255, Saint Charles, MO, 63301
Phone (636) 627-7974
Fax (636) 925-3159
Enumeration date Jan 27, 2011
Last updated in NPPES Jan 27, 2011

Taxonomy & licenses

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 2011001824 (MO) 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 Victor Marchlewski?
Victor Marchlewski is registered in NPPES with the primary taxonomy of Professional Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-01-27.