GUY T ALONSO MD
NPI 1700012432
Pediatrics - Pediatric Endocrinology in Aurora, CO
About Guy T Alonso Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GUY T ALONSO MD (NPI 1700012432) is an individual pediatric endocrinology provider in Aurora, Colorado, licensed in Colorado (DR.0052283) and active in the NPI registry since June 2009. He is enrolled in Medicare PECOS and maintains a secondary practice location in Aurora.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Guy T Alonso Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Guy Alonso reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Aurora, CO 80045
- Reassigned Medicare billing, Colorado enrollment
- 4,283 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 80045 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
AURORA, CO 80045
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Guy Alonso's NPI number?
The NPI number for Guy Alonso is 1700012432. It was assigned to this individual provider in the NPPES registry on June 9, 2009.
Where is Guy Alonso located?
Guy Alonso practices at 1775 Aurora Ct, Aurora, CO 80045. The listed phone number is (303) 724-2323.
What is Guy Alonso's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Endocrinology, with taxonomy code 2080P0205X.
Is Guy Alonso enrolled in Medicare?
Yes. Guy Alonso is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Guy Alonso's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Guy Alonso reassigns Medicare benefits to University Physicians Incorporated (Aurora, CO). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Guy Alonso's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Guy Alonso accept?
Health plans from Select Health and UnitedHealthcare list Guy Alonso as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Guy Alonso was last updated on October 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Guy T Alonso, MD · NPI 1700012432
Pediatric Endocrinology physician in Aurora, Colorado. Individual provider, active in the CMS NPPES registry since June 9, 2009.
## Identity
- **NPI:** 1700012432 (Entity type: Individual)
- **Enumerated:** June 9, 2009
- **Primary specialty:** Pediatrics - Pediatric Endocrinology · taxonomy 2080P0205X
- **State license:** DR.0052283 (Colorado)
- **Sole proprietor:** No
## Practice location
- **Address:** 1775 AURORA CT, Aurora, CO 80045-2506
- **Phone:** (303) 724-2323
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** University Physicians Incorporated (NPI 1730347113, Aurora, CO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 21, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1700012432) · Data from the CMS NPPES public registry.