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Unified Medical Language System® (UMLS®)

2010AA Patient Health Questionnaire Source Information

The Patient Health Questionnaire-9 (PHQ-9) is part of the PRIME-MD Patient Health Questionnaire (PHQ). The PHQ was developed by Kurt Kroenke, MD, Robert Spitzer, MD, and Janet B.W. Williams, DSW. The PHQ-9 included in the Metathesaurus is extracted from LOINC® and may not be a complete representation of the original source.

The PHQ-9 is the nine item depression scale of the Patient Health Questionnaire. The PHQ is a diagnostic tool for mental health disorders used by health care professionals. It is self-administered by patients.

The PHQ-9 is based directly on the diagnostic criteria for major depressive disorder in the Diagnostic and Statistical Manual Fourth Edition (DSM-IV).

The PHQ-9 is used by primary care physicians and other health care professionals.

Metathesaurus Update Frequency
PHQ-9 is included in each Metathesaurus release as part of LOINC.

Sites Consulted

  1. Patient Health Questionnaire (PHQ) screeners. New York (NY): Pfizer Inc; c2008. Screener overview; [cited 2008 Oct 02]. Available from:
  2. Resources for Clinicians [Internet]. The MacArthur Initiative on Depression and Primary Care at Dartmouth & Duke; c2003-2006. Patient Health Questionnaire; [cited 2008 Oct 02]. Available from: