Billable / Specific Code
ICD-10-CM N21.8 is the diagnosis code for Other lower urinary tract calculus. This code falls under the section "Urolithiasis" within Chapter 14 — Diseases of the genitourinary system (N00-N99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where N21.8 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, N21.8 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
N21.8 is the ICD-10-CM diagnosis code for "Other lower urinary tract calculus". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of N21.8 is N21 ("Calculus of lower urinary tract"). N21.8 provides a more specific classification within this category.
N21.8 is located in Section N20-N23 — "Urolithiasis" within Chapter 14 of the ICD-10-CM Tabular List.
Use N21.8 when the patients documented diagnosis matches "Other lower urinary tract calculus" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Other lower urinary tract calculus is N21.8.
Yes, N21.8 can be used as a primary diagnosis code since it is billable and specific.
N21.8 is in Chapter 14 of the ICD-10-CM Tabular List.
Yes, N21.8 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.