N21
Header — not billableCalculus of lower urinary tract
The ICD-10 code for calculus of lower urinary tract is N21.
N21 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 4 more specific codes below.
Clinical notes
Includes
Terms listed here further define or give examples of the conditions grouped under this code — they describe what the code covers, not a separate diagnosis.
- calculus of lower urinary tract with cystitis and urethritis
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- N20Calculus of kidney and ureternon-billable header
- N22Calculus of urinary tract in diseases classified elsewhere
- N23Unspecified renal colic
- N21Calculus of lower urinary tractnon-billable header