Question: Using the techniques described in this chapter carefully read through the case study and determine the most accurate ICD-10-CM code(s) and external cause code(s) if appropriate. Answer each question as it guides you through the coding process. Remember; check the chapter specific, sub-chapter specific and category specific notations within the Tabular list. Brent Brooke, an 18-year-old male, presents for immunizations before joining the army. Brent passes out when given an injection. Dr. Meetze diagnoses Brent with fear of injections. Be sure to list the codes, one code per box, in the correct sequence. Capitalization, punctuation, and spacing can impact whether or not your answer is correct. Follow coding best practices. What is the principal diagnosis code?