Underdosing of histamine H2-receptor blockers, sequela

This code signifies a long-term consequence or complication arising from the insufficient or inadequate administration of histamine H2-receptor blockers. It indicates that a patient experienced a health problem that is a direct result of not receiving enough of this medication over time, rather than an acute event.

Apply this code when documenting a chronic condition or lasting health issue that is directly attributable to the underdosing of H2-receptor blockers. This might include persistent or recurrent peptic ulcers, severe GERD complications, or other gastrointestinal sequelae that developed due to insufficient acid suppression. This code is appropriate for the residual effects after the underdosing event has passed.

• Always assign an additional code(s) to specify the particular sequela (e.g., K25.4 for chronic gastric ulcer with hemorrhage).
• Ensure documentation clearly links the current condition to the prior underdosing of H2-receptor blockers.
• This "S" seventh character indicates a sequela, meaning the residual effect of a previous injury or illness.