Adverse effect of sulfonamides, sequela

This code signifies a long-term or residual health problem resulting from a past adverse reaction to a sulfonamide medication. These sequelae are persistent conditions that manifest after the acute phase of the adverse effect has resolved. Examples include chronic kidney disease following drug-induced nephritis, or permanent skin discoloration after a severe rash.

Apply this code when documenting a patient's current condition that is a direct, lasting consequence of a previous adverse reaction to a sulfonamide. This is used for conditions that are no longer acute but represent a permanent or chronic change due to the drug. It should be used in conjunction with a code for the specific sequela.

• Always sequence this code after the code describing the specific sequela (e.g., chronic kidney disease).
• Ensure documentation clearly links the current condition to a past sulfonamide adverse effect.
• Do not use for acute adverse reactions; those require codes from the initial encounter or subsequent encounter categories.