NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Hall Zacharewicz, PH.D.

Specialist in Boulder, CO · enumerated 2007 · practices at Neuropsychological Consultants LLC.

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

National Provider Identifier

1346388691

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Registry record

Entity type Individual (Type 1)
Name Dr. Mark Hall Zacharewicz
Credential PH.D.
Sex Male
Practice address 2523 Broadway, Suite 200, Boulder, CO, 80304
Phone (303) 938-9244
Fax (303) 413-1308
Enumeration date Feb 1, 2007
Last updated in NPPES Jun 16, 2015

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 2216 (CO) Primary
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

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.

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Frequently asked questions

Is NPI 1346388691 active?
Yes, as of the latest NPPES snapshot, NPI 1346388691 is active (record last updated 2015-06-16).
How do I verify Mark Zacharewicz's NPI record?
Cross-check NPI 1346388691 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-06-16.