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Edit this profileAt a glance
- 9961 Sierra Ave, Fontana, CA 92335
About Dr. Tjoa
Walter S. Tjoa, MD is a healthcare provider in Fontana, CA specializing in dermatology. This provider record is associated with NPI 1801955463.
Factual summary compiled by Guide.md from public records; not written by this provider.
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (909) 427-3910
- Email not available
Practice Locations
9961 SIERRA AVE
Fontana, CA 92335
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 dermatologists at this location 1
Same specialty, same street address — most likely the same department or group.
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.
Common questions
What is Dr. Tjoa's specialty?
Dr. Tjoa is a dermatologist (skin doctor) in Fontana, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Dermatology”.
NPI registry
Where can I find Dr. Tjoa?
Dr. Tjoa is listed at 9961 Sierra Ave, Fontana, CA 92335. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Tjoa?
The number on file is (909) 427-3910. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Dr. Tjoa?
Dr. Tjoa's National Provider Identifier is 1801955463. 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 much experience does Dr. Tjoa have?
Dr. Tjoa has 20+ years experience. Registered with an NPI since 2006. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.
NPI registry
Is Dr. Tjoa's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Tjoa. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.