TIMOTHY G GRECO MD
NPI 1255369757
Emergency Medicine in Fullerton, CA
About Timothy G Greco Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
TIMOTHY G GRECO MD (NPI 1255369757) is an individual emergency medicine provider in Fullerton, California, licensed in California (G35541) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 6
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Timothy G Greco Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Timothy Greco reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Fullerton, CA 92835
- Reassigned Medicare billing, California enrollment
- 52 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 92835 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.
FULLERTON, CA 92835
FULLERTON, CA 92835
FULLERTON, CA 92835
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 Timothy Greco's NPI number?
The NPI number for Timothy Greco is 1255369757. It was assigned to this individual provider in the NPPES registry on June 30, 2006.
Where is Timothy Greco located?
Timothy Greco practices at 101 E Valencia Mesa Dr Em Dept, Fullerton, CA 92835. The listed phone number is (714) 992-3965.
What is Timothy Greco's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Timothy Greco enrolled in Medicare?
Yes. Timothy Greco is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Timothy Greco's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Timothy Greco reassigns Medicare benefits to St Jude Emergency Medical Group Inc (Fullerton, CA). 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 Timothy Greco's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Timothy Greco was last updated on March 11, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.
# Timothy G Greco, MD · NPI 1255369757
Emergency Medicine physician in Fullerton, California. Individual provider, active in the CMS NPPES registry since June 30, 2006.
## Identity
- **NPI:** 1255369757 (Entity type: Individual)
- **Enumerated:** June 30, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** G35541 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 E VALENCIA MESA DR, EM DEPT, Fullerton, CA 92835-3809
- **Phone:** (714) 992-3965
## 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:** St Jude Emergency Medical Group Inc (NPI 1720190804, Fullerton, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** March 11, 2009
- **Other identifiers:** Medicare PIN WG35541A (CA); Medicare UPIN A46392; Medicaid 00G355410 (CA); and 3 more
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Source: [NPI Profile](https://npiprofile.com/npi/1255369757) · Data from the CMS NPPES public registry.