Poisoning by vitamin K (phytonadione)

This code represents an adverse effect or overdose resulting from the administration or ingestion of vitamin K, specifically phytonadione. This can manifest as various toxic reactions due to excessive levels of the vitamin in the body.

Use this code when documentation clearly indicates a patient is experiencing symptoms or complications directly attributable to an overdose or poisoning by vitamin K. This typically occurs in scenarios of accidental ingestion, therapeutic misadventure, or intentional overdose. Supporting documentation should detail the substance, the adverse reaction, and the causal link.

• Always sequence this code as a secondary diagnosis when an external cause code (E-code) is available to describe the circumstances of the poisoning (e.g., accidental, therapeutic misadventure).
• Do not use this code for allergic reactions to vitamin K; those would be coded differently.
• Ensure the documentation specifies "poisoning" or "overdose" rather than just an adverse effect at therapeutic levels, which would typically fall under different code ranges.