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Background Physicians across specialties need to be skilled at diagnosing and treating depression, yet studies show underrecognition and inadequate treatment. Understanding the reasons requires specifying the influence of patient presentation, screening, and physician competence. Objective We deployed an unannounced standardized patient (SP) case to assess clinic screening and internal medicine (IM) residents' practices in identifying, documenting, and treating depression. Methods The SP represented a new patient presenting to the outpatient clinic, complaining of fatigue, with positive Patient Health Questionnaire (PHQ) items 2 and 9 and a family history of depression. The SPs assessed clinic screening and IM resident practices; appropriate treatment was assessed through chart review and defined as the resident doing at least 1 of the following: prescribing a selective serotonin reuptake inhibitor (SSRI), making a referral, or scheduling a 2-week follow-up. Results Of 129 IM residents, 85 (66%) provided appropriate treatment, 79 (61%) appropriately referred, 59 (46%) prescribed an SSRI, and 49 (38%) scheduled a 2-week follow-up, while 40 (31%) did not add depression to the problem list. The IM residents who used PHQ-2 and PHQ-9 were more likely to appropriately (89%) versus inappropriately (50%) treat (P < .001). Compared with those who did not, residents who treated appropriately assessed depression symptoms more (P < .001) and had better communication (73% versus 50%, P = .02), patient centeredness (74% versus 42%, P = .03), and patient activation skills (35% versus 11%, P < .001). Conclusions The use of unannounced SPs helps identify targets for training residents to provide evidence-based treatment of depression. [ABSTRACT FROM AUTHOR]