Four Corners Testing
Four Corners Testing holds 7 active organization NPIs in the federal registry, with practice locations in 7 cities in 5 states. All list clinic/center as their primary taxonomy; each location can bill under its own NPI.
Search the organization with your city to find the NPI for the location you visit or bill.
Find a location's NPILos Angeles, CA has the most NPIs, 1
Source: CMS NPPES monthly file of Aug 9, 2026, organization NPIs by practice city.
Most NPIs were issued in 2022 and 2023
Source: CMS NPPES, enumeration dates.
6 NPIs were issued in 2023 alone, more than in any other year.
Los Angeles, CA locations
The city with the most Four Corners Testing NPIs. The full list of all 7 follows.
| NPI | Location | Primary taxonomy | Issued |
|---|---|---|---|
| 1942916978 | 453 S SPRING STREET STE 400 PMB1274, Los Angeles, CA | Clinic/Center | Jan 24, 2023 |
All 7 locations, by state and city
| NPI | Location | Primary taxonomy | Issued |
|---|---|---|---|
| 1942916978 | 453 S SPRING STREET STE 400 PMB1274, Los Angeles, CA | Clinic/Center | Jan 24, 2023 |
| 1417653536 | 1065 SW 8TH ST # 1925, Miami, FL | Clinic/Center | Jan 31, 2023 |
| 1710693734 | 3343 PEACHTREE RD NE STE 145-2137, Atlanta, GA | Clinic/Center | Jan 24, 2023 |
| 1194431718 | 4050 GA-42, Locust Grove, GA | Clinic/Center | Jan 26, 2023 |
| 1376258665 | 301 S MCDOWELL STREET, SUITE 125 - 1652, Charlotte, NC | Clinic/Center | Jan 20, 2023 |
| 1386350494 | 14150 NE 20TH ST # F1-282, Bellevue, WA | Clinic/Center | Jan 24, 2023 |
| 1053053165 | 11625 RAINIER AVE S STE 102, Seattle, WA | Clinic/Center | Apr 9, 2022 |
Checking an organization
- Match the NPI to the exact location you will visit or bill; each location can have its own.
- Confirm the business entity with the secretary of state.
- Check the HHS-OIG exclusion list for the organization and its owners.
- Verify each clinician you will see on their own record and with the state license search.
Common questions
Why does Four Corners Testing have 7 NPIs?
An organization may obtain more than one Type 2 NPI, for example for separate locations or units that bill on their own. Four Corners Testing's NPIs list practice locations in 7 cities.
Is an organization NPI a license?
No. An NPI identifies who bills. Facilities and the clinicians who work there are licensed separately by the state.
Source: CMS National Plan and Provider Enumeration System (NPPES), monthly file of Aug 9, 2026 (NPPES files on CMS.gov). An NPI identifies who bills; it is not a license.