Injury of olfactory [1st ] nerve, right side, sequela

This code signifies a long-term or late effect resulting from a past injury to the right olfactory nerve. This typically manifests as persistent anosmia (loss of smell) or dysosmia (distorted smell) on the right side, occurring after the acute phase of the original trauma has resolved.

Apply this code when documenting a patient presenting with a chronic smell disturbance, specifically anosmia or dysosmia affecting the right nostril, clearly attributed to a prior injury. Documentation should explicitly state the laterality and the sequela nature of the olfactory nerve damage.

• Ensure documentation specifies "right side" and clearly indicates a sequela (e.g., "due to previous trauma," "residual effect of").
• Do not use for acute injuries; refer to the appropriate acute injury code from the S04 category.
• Always sequence this sequela code after the primary diagnosis for the current encounter, if applicable, or as the primary diagnosis if the sequela is the reason for the encounter.