NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Christian Hammann

Counselor in Tucson, AZ · enumerated 2026 · practices at Arizona Center for Innovative Stress & Trauma Treatment LLC.

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

National Provider Identifier

1255281291

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Mark Christian Hammann
Sex Male
Practice address 2913 E 22nd St, Tucson, AZ, 85713
Phone (520) 303-1697
Enumeration date Jan 30, 2026
Last updated in NPPES Jan 30, 2026

Taxonomy & licenses

101Y00000X Counselor Behavioral Health & Social Service Providers · License LAC-08387T (AZ) 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

Where does Mark Hammann practice?
The practice location on file with NPPES is in Tucson, AZ. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mark Hammann?
The National Provider Identifier (NPI) for Mark Hammann is 1255281291, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-30.