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.

1 to 25 of 342, exact name first

  1. Quest Diagnostics LLC

    Clinical Medical Laboratory · Branford, CT · issued Jun 5, 2007

    1841492444
  2. Quest Diagnostics LLC

    Clinical Medical Laboratory · Danbury, CT · issued Jun 5, 2007

    1093917544
  3. Quest Diagnostics LLC

    Clinical Medical Laboratory · Derby, CT · issued Jun 5, 2007

    1639371230
  4. Quest Diagnostics LLC

    Clinical Medical Laboratory · Hamden, CT · issued Jun 5, 2007

    1376745984
  5. Quest Diagnostics LLC

    Clinical Medical Laboratory · Hartford, CT · issued Jun 5, 2007

    1790987261
  6. Quest Diagnostics LLC

    Clinical Medical Laboratory · Hartford, CT · issued Nov 17, 2016

    1407398712
  7. Quest Diagnostics LLC

    Clinical Medical Laboratory · New Britain, CT · issued Jun 5, 2007

    1497957039
  8. Quest Diagnostics LLC

    Clinical Medical Laboratory · New Britain, CT · issued Jan 5, 2018

    1144737628
  9. Quest Diagnostics LLC

    Clinical Medical Laboratory · New Haven, CT · issued Jun 6, 2007

    1144423567
  10. Quest Diagnostics LLC

    Clinical Medical Laboratory · New Haven, CT · issued Oct 26, 2016

    1346792355
  11. Quest Diagnostics LLC

    Clinical Medical Laboratory · New London, CT · issued Oct 14, 2010

    1568772465
  12. Quest Diagnostics LLC

    Clinical Medical Laboratory · Newington, CT · issued Jun 5, 2007

    1831391473
  13. Quest Diagnostics LLC

    Clinical Medical Laboratory · Norwalk, CT · issued Jul 18, 2006

    1972521920
  14. Quest Diagnostics LLC

    Clinical Medical Laboratory · Norwich, CT · issued Jun 5, 2007

    1255533808
  15. Quest Diagnostics LLC

    Clinical Medical Laboratory · Norwich, CT · issued Oct 5, 2010

    1609185883
  16. Quest Diagnostics LLC

    Clinical Medical Laboratory · Norwich, CT · issued Feb 27, 2013

    1083954119
  17. Quest Diagnostics LLC

    Clinical Medical Laboratory · Norwich, CT · issued Jan 4, 2018

    1982111555
  18. Quest Diagnostics LLC

    Clinical Medical Laboratory · Prospect, CT · issued Jun 5, 2007

    1548462070
  19. Quest Diagnostics LLC

    Clinical Medical Laboratory · Stamford, CT · issued Jun 5, 2007

    1780886333
  20. Quest Diagnostics LLC

    Clinical Medical Laboratory · Stonington, CT · issued Oct 5, 2010

    1376852558
  21. Quest Diagnostics LLC

    Clinical Medical Laboratory · Stratford, CT · issued Jul 18, 2006

    1194743724
  22. Quest Diagnostics LLC

    Clinical Medical Laboratory · Wallingford, CT · issued Jun 21, 2006

    1174569909
  23. Quest Diagnostics LLC

    Clinical Medical Laboratory · Wallingford, CT · issued Feb 6, 2017

    1780122192
  24. Quest Diagnostics LLC

    Clinical Medical Laboratory · Waterbury, CT · issued Jan 28, 2020

    1710518824
  25. Quest Diagnostics LLC

    Clinical Medical Laboratory · Windsor, CT · issued Jun 5, 2007

    1932301587

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