The F90.9 diagnosis code in the ICD-10-CM system represents Attention-Deficit/Hyperactivity Disorder, Unspecified Type. It is used when a patient is diagnosed with ADHD but does not meet the full criteria for other subtypes, such as F90.0 (Predominantly Inattentive Type), F90.1 (Predominantly Hyperactive-Impulsive Type), or F90.2 (Combined Type).
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