ICD-10 Code E73.0: Congenital lactase deficiency

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Endocrine, nutritional and metabolic diseases (E00-E89).

When is it used?

• May be used when a clinician documents congenital lactase deficiency in a patient's medical record.
• May appear in hospital records, claims, referrals, and clinical documentation.
• This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

• A code alone does not explain severity, treatment plan, or outcome.
• A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

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Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

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