Other lactose intolerance

This code signifies forms of lactose intolerance that do not fit the descriptions of congenital, secondary, or primary (adult-onset) lactase deficiency. It encompasses atypical presentations or less common etiologies of the inability to digest lactose. This condition results in gastrointestinal symptoms upon consumption of lactose-containing products due to insufficient lactase enzyme activity.

Use this code when documentation specifies lactose intolerance but does not clearly indicate a congenital, primary, or secondary cause. This is appropriate for cases where the physician has diagnosed lactose intolerance, but the specific type is not further elaborated or falls outside the more common categories. Supporting documentation would include physician notes detailing symptoms like bloating, diarrhea, and abdominal pain after lactose ingestion, along with a diagnosis of "other lactose intolerance" or similar phrasing.

• Do not use this code if the documentation clearly specifies congenital (E73.0), secondary (E73.1), or primary (E73.8) lactase deficiency; those codes are more specific.
• Ensure the medical record explicitly states "lactose intolerance" or a similar diagnosis; avoid coding based solely on symptoms.
• Consider sequencing this code after any underlying conditions if the lactose intolerance is a manifestation of another disease, but not explicitly secondary to it.