ICD-10 Code E72.01 – Cystinuria (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E72.01 – Cystinuria
What it is
Cystinuria is an inherited disorder that causes excess cystine to spill into the urine, which can lead to recurrent kidney stones. Use this code for the underlying metabolic condition, not just a single stone episode.
Clinical signs
Common findings include recurrent urinary tract stones, flank pain, hematuria, and passage of gravel or stones. Clinical features vary; refer to documentation.
When to use this code
Use E72.01 when the record documents cystinuria or cystine stone disease as a diagnosed condition. It is appropriate when the clinician identifies the hereditary transport defect, even if the current encounter is for stone symptoms or follow-up care.
Code it when the chart supports a chronic metabolic diagnosis, not only when a stone is suspected. If the note only says “kidney stone” without cystinuria, check documentation before assigning this code.
Do not use for
Do not use this code for unspecified nephrolithiasis or other stone types without documentation of cystinuria. Check documentation if the record does not clearly link the condition to cystine stones.
Coding tip
Look for wording such as “cystinuria,” “cystine stones,” or hereditary cystine transport defect before assigning E72.01.