Achlorhydria

This code represents a condition characterized by the complete absence of hydrochloric acid in the gastric secretions. This lack of stomach acid impairs digestion, particularly protein breakdown, and can lead to malabsorption of certain nutrients. It is often associated with atrophic gastritis or pernicious anemia.

Apply this code when documentation explicitly states a diagnosis of achlorhydria, typically confirmed by gastric analysis showing a pH above 7.0 even after stimulation. This diagnosis is often made in patients presenting with symptoms such as dyspepsia, bloating, or signs of nutrient deficiencies like iron or vitamin B12.

• Differentiate from hypochlorhydria (reduced stomach acid), which is a distinct condition.
• Always code any underlying conditions, such as pernicious anemia (D51.0) or atrophic gastritis (K29.40, K29.41), as primary if they are the cause of the achlorhydria.
• Ensure documentation clearly supports the complete absence of hydrochloric acid, not just low levels.