Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

C3, Inc

Nutrition Chiropractor in Sioux City, IA · enumerated 2007 · authorized official Mark Chartier, Managing Partner.

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

National Provider Identifier

1982896353

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name C3, Inc

Other name <Unavail>

Practice address 2601 Apache Ct, Sioux City, IA, 51104

Phone (712) 277-9355

Fax (712) 277-9366

Enumeration date Aug 9, 2007

Last updated in NPPES Jul 23, 2021

Taxonomy & classification

111NN1001X Nutrition Chiropractor Chiropractic Providers · License 06891 (IA) Primary

Authorized official

Name Mark Chartier

Title Managing Partner

Phone (712) 277-9355

Other identifiers

Identifier	Type	State	Issuer
1982896353	Other	IA	GROUP NPI 1982896353
1316955594	Other	IA	NPI SEAN E. CHARTIER D.C.
0497446	Medicaid	IA	-
I21041	Other	IA	GROUP PTAN

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2021-07-23. Verify at npiregistry.cms.hhs.gov.

Where is C3, Inc located?

The practice location on file with NPPES is in Sioux City, IA.

Providers at this address

Browse all →

Genell Sandberg Psychologist · Sioux City, IA NPI 1851375802 Sean Chartier Chiropractor · Sioux City, IA NPI 1316955594 Matthew Cihak Mental Health Counselor · Sioux City, IA NPI 1124449541

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-23.