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Your client appears to have two issues, the second a consequence of the first.
From the scant information that you presented, because you have not done a long-term intake with him, since he is a new client, I would say that he was probably born with certain conditions (perhaps the missing digits are part of that syndrome).
He seems to have a Pervasive Developmental Disorder. Since you cannot say if it is Autism
or Asperger's Disorder, then you would best give him a preliminary Axis I diagnosis of 299.80 Pervasive Developmental Disorder Not Otherwise Specifiied
He needs to have a second Axis I diagnosis of 309.3 Adjustment Disorder With Disturbance of Conduct.
The Short Term Objectives of the first diagnosis is to identify the exact nature of clients PDD. The therapeutic intervention is to have client tested by child development expert for the type of PDD to see if it cannot be further refined.
The Short Term Objectives for the Ajustment Disorder are to: Identifuy the symptoms of his his pulsivity (defacing prooperty, anger, etc.) and to help him understand the connection between his impusive acts and his life's difficulties. The Therapeutic Interventions is to monitor, encourage, redirect, and give feedback to client relating to control over compulsive reactions, helping client increase his abiltity to observe himself, and teach him to implement these control techniques in his everyday life.
This should get you a good solid, and authentic DX and treatment plan.
Elliott Sewell, LPCC, NCC, CCMHC