Gna Diagnostic
NPI 1689888653 · Multi-Specialty Clinic/Center · Glendale, CA
Gna Diagnostic is a Multi-Specialty Clinic/Center organization in Glendale, CA (NPI 1689888653).
Provider details
- NPI number
- 1689888653
- Entity type
- Organization
- Primary specialty
- Multi-Specialty Clinic/CenterAmbulatory Health Care Facilities
- Organization subpart
- No
- Authorized official
- Grant Kostikian, Owner(818) 281-8091
Specialties & taxonomies
Ambulatory Health Care Facilities
- Sleep Disorder Diagnostic Clinic/Center261QS1200X
Ambulatory Health Care Facilities
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-09
- Last updated
- 2025-09-11
Frequently asked questions
- What is Gna Diagnostic's NPI number?
- Gna Diagnostic's National Provider Identifier (NPI) is 1689888653, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Gna Diagnostic?
- Gna Diagnostic is classified in the NPPES registry as Multi-Specialty Clinic/Center (Ambulatory Health Care Facilities).
- Where is Gna Diagnostic located?
- Gna Diagnostic's practice location on file with NPPES is 1386 E Garfield Ave, Glendale, CA 91205-2660.
- What is Gna Diagnostic's phone number?
- The practice phone number listed in the NPPES registry for Gna Diagnostic is (818) 281-8091.
- Who is the authorized official for Gna Diagnostic?
- The authorized official listed on Gna Diagnostic's NPPES record is Grant Kostikian, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Gna Diagnostic's NPI active?
- Yes — Gna Diagnostic's NPI (1689888653) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.