Leopoldo Alonzo, MD
NPI 1730306218 · Obstetrics & Gynecology Physician · Fontana, CA
Leopoldo Alonzo, MD is a Obstetrics & Gynecology Physician provider in Fontana, CA (NPI 1730306218).
Provider details
- NPI number
- 1730306218
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G79776 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$80 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-04-19
- Last updated
- 2008-09-23
Frequently asked questions
- What is Leopoldo Alonzo's NPI number?
- Leopoldo Alonzo's National Provider Identifier (NPI) is 1730306218, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leopoldo Alonzo's specialty?
- Leopoldo Alonzo is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Leopoldo Alonzo located?
- Leopoldo Alonzo's practice location on file with NPPES is 9961 Sierra Ave, Fontana, CA 92335-6720.
- What is Leopoldo Alonzo's phone number?
- The practice phone number listed in the NPPES registry for Leopoldo Alonzo is (909) 427-3910.
- Is Leopoldo Alonzo's NPI active?
- Yes — Leopoldo Alonzo's NPI (1730306218) is active in the NPPES registry as of the last update on 2008-09-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.