Provider Profile
Diana Seif
Unclaimed ProfileAbout Diana Seif
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Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Contact Information
- (909) 418-6923
- Email not available
Practice Locations
1556 S SULTANA AVE
Ontario, CA 91761
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other mental health counselors at this location 2
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 6 related providers in 1 group
Common questions
What does Diana Seif specialize in?
Diana Seif is a mental health counselor in Ontario, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Diana Seif located?
Diana Seif is listed at 1556 S Sultana Ave, Ontario, CA 91761. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Diana Seif's phone number?
The number on file is (909) 418-6923. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Diana Seif's NPI number?
Diana Seif's National Provider Identifier is 1942571344. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
How long has Diana Seif been practicing?
Diana Seif has 14+ years experience. Registered with an NPI since 2012. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.
NPI registry
Has Diana Seif confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Diana Seif. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.