Patient presents with opioid use disorder, fulfilling DSM-5 diagnostic criteria for opioid addiction.  Symptoms include intense cravings for opioids, compulsive opioid use despite negative consequences, loss of control over opioid intake, tolerance requiring increased dosage for desired effect, and withdrawal symptoms upon cessation or dose reduction.  Patient reports a history of opioid abuse, escalating use, and unsuccessful attempts to quit.  Physical examination may reveal constricted pupils, track marks indicating intravenous drug use, and signs of opioid withdrawal such as lacrimation, rhinorrhea, piloerection, and yawning.  Patient's opioid dependence impacts their social and occupational functioning, resulting in relationship difficulties, financial strain, and potential legal issues.  Assessment includes detailed substance use history, mental status examination, and laboratory testing including urine drug screening to confirm opioid presence and rule out other substances.  Differential diagnoses include chronic pain, anxiety disorders, and depression.  Treatment plan includes opioid detoxification under medical supervision, medication-assisted treatment (MAT) with buprenorphine or methadone, individual and group therapy addressing underlying psychological factors contributing to addiction, and relapse prevention strategies.  Patient education emphasizes the chronic relapsing nature of opioid addiction, the importance of adherence to treatment, and available support resources such as Narcotics Anonymous.  Prognosis depends on patient motivation, treatment compliance, and support system.  Continued monitoring and follow-up are essential to assess treatment efficacy, manage withdrawal symptoms, and prevent relapse.  ICD-10 code F11.20 is applied for opioid dependence.  Medical billing and coding procedures adhere to established guidelines.