What should you do if you encounter a 400-series code you do not recognize on a call?

• A. Proceed with the call using your best guess.
• B. Stop and verify the code with dispatch or a supervisor before proceeding.
• C. Document it and seek clarification later.
• D. Ignore and continue.

Answer: (B)

When you come across an unfamiliar 400-series code, pause and verify with dispatch or a supervisor before taking action. These codes are shorthand, and meanings can vary by agency and change over time. Acting on a guess can lead to the wrong response, miscommunication, or unsafe handling of the situation. By stopping to confirm the exact meaning, you ensure you’re using the correct code and applying the appropriate resources and procedures. This keeps communication clear, supports proper decision-making, and maintains safety for everyone involved. Guessing or delaying clarification can create confusion, misallocate units, or leave the scene without the proper guidance, which is why verification is the right step.