Timothy Greco, MD
NPI 1255369757 · Emergency Medicine Physician · Fullerton, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Timothy Greco, MD is a Emergency Medicine Physician provider in Fullerton, CA (NPI 1255369757).
Provider details
- NPI number
- 1255369757
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G35541 (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
- 2006-06-30
- Last updated
- 2009-03-11
Frequently asked questions
- What is Timothy Greco's NPI number?
- Timothy Greco's National Provider Identifier (NPI) is 1255369757, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Timothy Greco's specialty?
- Timothy Greco is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Timothy Greco located?
- Timothy Greco's practice location on file with NPPES is 101 E Valencia Mesa Dr, Fullerton, CA 92835-3809.
- What is Timothy Greco's phone number?
- The practice phone number listed in the NPPES registry for Timothy Greco is (714) 992-3965.
- Does Timothy Greco accept Medicare?
- Timothy Greco is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Timothy Greco's NPI active?
- Yes — Timothy Greco's NPI (1255369757) is active in the NPPES registry as of the last update on 2009-03-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.