ICD-10 Code D73.0 – Hyposplenism (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D73.0 – Hyposplenism
What it is
Hyposplenism means reduced spleen function. You use this code when the spleen is present but not working normally, so immune and filtering activity is diminished.
Clinical signs
Clinical features vary; refer to documentation. Common references describe impaired splenic function, sometimes with Howell-Jolly bodies on peripheral smear or a history suggesting functional asplenia.
When to use this code
Use D73.0 when the record clearly documents hyposplenism or functional splenic impairment. It may apply when a clinician notes reduced splenic function without complete removal of the spleen. If the chart only suggests possible dysfunction, check documentation before coding.
Do not use for
Do not use this code for splenectomy or absent spleen, which are coded differently. Avoid it when the note describes another splenic disorder without stating reduced function.
Coding tip
Confirm that the provider documents functional loss of the spleen, not just a structural spleen finding.