NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Anthony Cook, PHD

Clinical Psychologist in Ellisville, MO · enumerated 2005.

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

National Provider Identifier

1841277894

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Mark Anthony Cook
Credential PHD
Sex Male
Practice address 172 Clarkson Executive Park, Ellisville, MO, 63011
Phone (636) 230-3113
Fax (636) 230-3044
Enumeration date Dec 29, 2005
Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 01227 (MO) Primary
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier Type State Issuer
5018 Other - BLUE CROSS BLUE SHIELD MO
431466627C00 Other - MERCY UNITY HEALTH PLAN
115397 Other - HEALTHLINK PPO

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 Mark Cook?
The National Provider Identifier (NPI) for Mark Cook is 1841277894, a Type 1 (individual) record in the CMS NPPES registry.
Where does Mark Cook practice?
The practice location on file with NPPES is in Ellisville, MO. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.