ADA and Direct Access Practice Test 2026 – Your Comprehensive All-in-One Guide to Exam Success!

The main idea is that coding approach shifts once a definitive diagnosis is documented. Early encounters often rely on signs, symptoms, or rule-out diagnoses because the exact condition isn’t confirmed yet. Once the diagnosis is confirmed, the coder changes to reflect the actual disease with the most specific ICD-10-CM code available, as supported by the provider’s notes.

This matters because using the definitive diagnosis improves accuracy and proper reimbursement. For example, if a patient comes in with fever and cough and pneumonia is later confirmed, coding should move from symptom codes to the pneumonia code that specifies the condition and, if possible, the site or type. If other conditions are present, you sequence the primary diagnosis as documented and add related conditions as needed, following documentation guidance. In short, when confirmation happens, shift from provisional or symptom-based codes to the specific, diagnosed condition.