ICD-10 Code A07.1 – Giardiasis [lambliasis] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A07.1 – Giardiasis [lambliasis]
What it is
A07.1 identifies giardiasis, an intestinal infection caused by Giardia organisms. Use it when the record documents this specific parasitic infection, also called lambliasis.
Clinical signs
Typical findings include diarrhea, abdominal cramps, bloating, nausea, and foul-smelling or greasy stools. Clinical features vary; refer to documentation.
When to use this code
Use A07.1 when the provider documents giardiasis, Giardia infection, or lambliasis as the diagnosis. It also applies when the note clearly links gastrointestinal symptoms to confirmed Giardia infection. If the chart only says “infectious diarrhea” or “parasite,” check documentation before coding this specific code.
Do not use for
Do not use A07.1 for nonspecific diarrhea, other parasitic intestinal infections, or suspected Giardia without documentation. Check documentation if the organism is not identified.
Coding tip
Code A07.1 only when Giardia is named in the record or clearly confirmed.