Final answer:
The correct code for Randy's symptoms is F43.12 Post-traumatic stress disorder, chronic,(option 2) as his PTSD symptoms have persisted for over three months.
Step-by-step explanation:
Randy, who has been home from Iraq for three months, experiences recurring flashbacks of his time in the war zone and has difficulty sleeping. His symptoms, which indicate a persistent presence following a traumatic experience, are being treated by Dr. Jones as on-going PTSD. The correct code for Post-traumatic stress disorder with these presenting symptoms, considering they have persisted for three months, would be F43.12 Post-traumatic stress disorder, chronic. This diagnosis aligns with Randy’s symptoms of PTSD which have continued beyond the initial phase following the trauma and might benefit from continued therapeutic interventions addressing chronic PTSD.