Physician Profile
Leopoldo J. Alonzo, MD
Unclaimed ProfileAbout Dr. Alonzo
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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) 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 OB-GYNs at this location 3
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 does Dr. Alonzo specialize in?
Dr. Alonzo is an OB-GYN in Fontana, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Obstetrics & Gynecology”.
NPI registry
Where is Dr. Alonzo located?
Dr. Alonzo 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
What is Dr. Alonzo's phone number?
The number on file is (909) 427-3910. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Alonzo's NPI number?
Dr. Alonzo's National Provider Identifier is 1730306218. 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 Dr. Alonzo been practicing?
Dr. Alonzo has 19+ years experience. Registered with an NPI since 2007. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.
NPI registry
Has Dr. Alonzo confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Alonzo. 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.