RATIONALE & OBJECTIVE: Digital and mobile health (mHealth) technologies improve patient-provider communication and increase information accessibility. We assessed technology use, attitudes toward using mHealth technologies, and the proficiency in using mHealth technologies among individuals with chronic kidney disease (CKD). STUDY DESIGN: Cross-sectional survey with open text responses SETTING & PARTICIPANTS: Chronic Renal Insufficiency Cohort Study participants who completed current use and interest in using mHealth technologies questionnaires, and the eHealth literacy Survey (eHEALS). EXPOSURES: Participant characteristics OUTCOMES: Technology use (internet/email/smartphone/mHealth applications [apps]), interest in future mHealth use, and proficiency in using digital and mHealth technologies, or eHealth literacy, determined by eHEALS score. ANALYTIC APPROACH: Poisson regression and a qualitative content analysis of open-ended responses RESULTS: Study participants (N=932) had a mean age of 68 years, eGFR 54 ml/min/1.73m(2), and 59% were male. Approximately 70% reported current use of internet/email/smartphones, and 35% used mHealth apps; only 27% had adequate eHealth literacy (eHEALS score ≥32). Participants