N21.8: Other lower urinary tract calculus
N21.8 is the billable ICD-10-CM diagnosis code for Other lower urinary tract calculus. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code N21.8?
N21.8 is the ICD-10-CM diagnosis code for Other lower urinary tract calculus. It belongs to category N21 (Calculus of lower urinary tract).
Is N21.8 a billable code?
Yes. N21.8 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does N21.8 belong to?
N21.8 is part of ICD-10-CM category N21 — Calculus of lower urinary tract, which has 8 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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