Adverse effect of histamine H2-receptor blockers, sequela

This code signifies a long-term or residual condition resulting from an adverse reaction to histamine H2-receptor blockers. These are medications commonly used to reduce stomach acid. The adverse effect is no longer acute but has left a lasting impact on the patient's health.

Apply this code when documenting a chronic or permanent sequela directly attributable to a past adverse effect of an H2-receptor blocker. Examples include persistent liver damage, chronic kidney injury, or enduring neurological deficits that developed as a consequence of the drug. This code is used after the acute phase of the adverse reaction has resolved.

• Always sequence this code after the code for the specific sequela (e.g., chronic hepatitis, renal failure).
• Ensure documentation clearly links the current chronic condition to a prior adverse effect of an H2-receptor blocker.
• Do not use this code for acute adverse reactions; use the appropriate acute adverse effect code instead.