Mark Gass

Mark Gass is a Addiction (Substance Use Disorder) Counselor provider (Counselor) practicing in Vista, CA, registered in the NPPES registry with NPI 1679069389 since 2018. Practices at Alpha Project for the Homeless (listed at the same practice address in NPPES).

✓ Active NPI ✓ Valid NPI checksum Sole proprietor

NPI	1679069389
Entity type	Individual (Type 1)
Name	Mark Gass
Sex	Male
Practice address	Vista, CA, 92083
Phone	7606309922
Fax	7606309996
Enumeration date	2018-07-05
Last updated in NPPES	2018-07-05

Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
101YA0400X	Addiction (Substance Use Disorder) Counselor	Primary	—	—

Copy-ready billing details

Provider: Mark Gass
NPI: 1679069389
Taxonomy: 101YA0400X (Addiction (Substance Use Disorder) Counselor)
Address: Vista, CA, 92083

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1295947364	Alpha Project for the Homeless	Organization	Substance Abuse Rehabilitation Facility	Vista, CA
1750779567	Lavonne Mormino	Individual	Case Manager/Care Coordinator	Vista, CA
1619409703	Katherine Friedlander	Individual	Clinical Social Worker	Vista, CA
1376058180	Avery Hunter	Individual	Addiction (Substance Use Disorder) Counselor	Vista, CA
1194229278	Michael Townsend	Individual	Peer Specialist	Vista, CA
1205322138	Jason Rodriguez	Individual	Addiction (Substance Use Disorder) Counselor	Vista, CA
1013403724	Jacob Baldwin	Individual	Addiction (Substance Use Disorder) Counselor	Vista, CA
1972099687	Pedro Vera	Individual	Addiction (Substance Use Disorder) Counselor	Vista, CA

Verify this record

Cross-check NPI 1679069389 against the authoritative CMS record: view Mark Gass on the official NPPES registry .

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 or validate an NPI number.

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 Mark Gass?

Mark Gass is registered in NPPES with the primary taxonomy of Addiction (Substance Use Disorder) Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2018-07-05.