Louis Difronzo, MD
NPI 1437220407 · Surgical Oncology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Surgical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Louis Difronzo, MD is a Surgical Oncology Physician provider in Los Angeles, CA (NPI 1437220407).
Provider details
- NPI number
- 1437220407
- Entity type
- Individual
- Primary specialty
- Surgical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G81895 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
- 2006-11-13
- Last updated
- 2021-11-29
Frequently asked questions
- What is Louis Difronzo's NPI number?
- Louis Difronzo's National Provider Identifier (NPI) is 1437220407, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Louis Difronzo's specialty?
- Louis Difronzo is listed in the NPPES registry with a primary specialty of Surgical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Louis Difronzo located?
- Louis Difronzo's practice location on file with NPPES is 4733 W Sunset Blvd, Los Angeles, CA 90027-6021.
- What is Louis Difronzo's phone number?
- The practice phone number listed in the NPPES registry for Louis Difronzo is (323) 783-4011.
- Does Louis Difronzo accept Medicare?
- Louis Difronzo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Louis Difronzo's NPI active?
- Yes — Louis Difronzo's NPI (1437220407) is active in the NPPES registry as of the last update on 2021-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.