Oscar Alonso, M.D.
NPI 1447285739 · Specialist · Downers Grove, IL
Enrolled with Medicare as Practitioner - Otolaryngology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Oscar Alonso, M.D. is a Specialist provider in Downers Grove, IL (NPI 1447285739).
Provider details
- NPI number
- 1447285739
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 036064967 (IL)
Specialties & taxonomies
Other Service Providers
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.
$15 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
- 2006-07-12
- Last updated
- 2021-04-16
- Certified
- 2021-04-16
Frequently asked questions
- What is Oscar Alonso's NPI number?
- Oscar Alonso's National Provider Identifier (NPI) is 1447285739, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Oscar Alonso's specialty?
- Oscar Alonso is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Oscar Alonso located?
- Oscar Alonso's practice location on file with NPPES is 1121 Warren Ave, Downers Grove, IL 60515-3572.
- What is Oscar Alonso's phone number?
- The practice phone number listed in the NPPES registry for Oscar Alonso is (630) 960-5310.
- Does Oscar Alonso accept Medicare?
- Oscar Alonso is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Oscar Alonso's NPI active?
- Yes — Oscar Alonso's NPI (1447285739) is active in the NPPES registry as of the last update on 2021-04-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.