THOMAS A GIONIS M.D.
NPI 1780638049
Emergency Medicine in Norwalk, CA
About Thomas A Gionis M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THOMAS A GIONIS M.D. (NPI 1780638049) is an individual emergency medicine provider in Norwalk, California, licensed in California (C39248) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS and is a graduate of Medical University Of South Carolina College Of Medicine (1975).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Thomas A Gionis M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Thomas Gionis reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Modesto, CA 95354
- Reassigned Medicare billing, California enrollment
- 180 clinicians in this Medicare group
Willows, CA 95988
- Reassigned Medicare billing, California enrollment
- 53 clinicians in this Medicare group
Miami Lakes, FL 33014
- Reassigned Medicare billing, Florida enrollment
- 3 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.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90650 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.
NORWALK, CA 90650
NORWALK, CA 90650
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 Thomas Gionis's NPI number?
The NPI number for Thomas Gionis is 1780638049. It was assigned to this individual provider in the NPPES registry on May 20, 2006.
Where is Thomas Gionis located?
Thomas Gionis practices at 13100 Studebaker Rd, Norwalk, CA 90650. The listed phone number is (562) 864-6377.
What is Thomas Gionis's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Thomas Gionis enrolled in Medicare?
Yes. Thomas Gionis is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Thomas Gionis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Gionis reassigns Medicare benefits to 3 organizations: American Specialty Physicians Group Inc (Modesto, CA), Glenn Medical Center, LLC (Willows, CA) and New Life Clinical Research Inc (Miami Lakes, FL). Each 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 Thomas Gionis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Thomas Gionis accept?
Health plans from Oscar Health Maintenance Organization of Florida list Thomas Gionis 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 Thomas Gionis was last updated on November 27, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years 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.
# Thomas A Gionis, M.D. · NPI 1780638049
Emergency Medicine physician in Norwalk, California. Individual provider, active in the CMS NPPES registry since May 20, 2006.
## Identity
- **NPI:** 1780638049 (Entity type: Individual)
- **Enumerated:** May 20, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** C39248 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 13100 STUDEBAKER RD, Norwalk, CA 90650-2531
- **Phone:** (562) 864-6377
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): American Specialty Physicians Group Inc (NPI 1164363024, Modesto, CA); Glenn Medical Center, LLC (NPI 1336187178, Willows, CA); New Life Clinical Research Inc (NPI 1396340576, Miami Lakes, FL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Medical University Of South Carolina College Of Medicine, class of 1975
## Record status
- **NPPES last updated:** November 27, 2007
- **Other identifiers:** Medicare PIN WC39248D (CA); Medicare UPIN A37094; Medicare PIN P00379121 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1780638049) · Data from the CMS NPPES public registry.