NPPES file of Aug 9, 2026

Find an organization's NPI

342 active organization NPIs are registered under names beginning "Quest Diagnostics". Each location can bill under its own NPI, so add the city to find the one you need.

326 to 342 of 342, exact name first

  1. Quest Diagnostics Massachusetts LLC

    Clinical Medical Laboratory · Worcester, MA · issued Apr 17, 2013

    1043653330
  2. Quest Diagnostics Massachusetts LLC

    Clinical Medical Laboratory · Worcester, MA · issued May 15, 2013

    1619313863
  3. Quest Diagnostics Massachusetts LLC

    Clinical Medical Laboratory · Worcester, MA · issued Mar 21, 2014

    1033536636
  4. Quest Diagnostics Massachusetts LLC

    Clinical Medical Laboratory · Worcester, MA · issued Mar 7, 2017

    1508306747
  5. Quest Diagnostics Massachusetts LLC

    Clinical Medical Laboratory · Worcester, MA · issued Jan 23, 2019

    1770047995
  6. Quest Diagnostics Massachusetts LLC

    Clinical Medical Laboratory · Worceter, MA · issued Mar 27, 2013

    1962745067
  7. Quest Diagnostics Nichols Institute

    Clinical Medical Laboratory · San Juan Capistrano, CA · issued Jun 21, 2006

    1780620526
  8. Quest Diagnostics Nichols Institute, INC

    Clinical Medical Laboratory · Chantilly, VA · issued Jun 21, 2006

    1447296272
  9. Quest Diagnostics Of Pennsylvania INC

    Clinical Medical Laboratory · Buffalo, NY · issued Jul 18, 2006

    1366460321
  10. Quest Diagnostics Of Pennsylvania INC

    Clinical Medical Laboratory · North Syracuse, NY · issued Jul 18, 2006

    1336167964
  11. Quest Diagnostics Of Pennsylvania INC

    Clinical Medical Laboratory · Boardman, OH · issued Aug 25, 2008

    1962659656
  12. Quest Diagnostics Of Pennsylvania INC

    Clinical Medical Laboratory · Twinsburg, OH · issued Jul 18, 2006

    1205854817
  13. Quest Diagnostics Of Pennsylvania INC

    Clinical Medical Laboratory · Warren, OH · issued Aug 25, 2008

    1275780967
  14. Quest Diagnostics Of Pennsylvania INC

    Clinical Medical Laboratory · Pittsburgh, PA · issued Apr 28, 2006

    1578520946
  15. Quest Diagnostics Of Pennsylvania, INC

    Clinical Medical Laboratory · Pittsburgh, PA · issued Jun 21, 2006

    1841236684
  16. Quest Diagnostics Tb LLC

    Clinical Medical Laboratory · Memphis, TN · issued May 7, 2012

    1114286523
  17. Quest Diagnostics Venture LLC

    Clinical Medical Laboratory · Pittsburgh, PA · issued Nov 15, 2006

    1619040284

Source: CMS NPPES monthly file of Aug 9, 2026, organization (Type 2) records.