N21
Calculus of lower urinary tract
Non-billable headerNot valid on its own. Use one of the more specific codes under it.
N21 is a non-billable ICD-10-CM code category for calculus of lower urinary tract. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are N21.0 Calculus in bladder; N21.1 Calculus in urethra; N21.8 Other lower urinary tract calculus and N21.9 Calculus of lower urinary tract, unspecified. Its coding notes include 8 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
Inherited from Chapter 14 Diseases of the genitourinary system
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Includes
Further defines or gives examples of the content of the category.
This code
- calculus of lower urinary tract with cystitis and urethritis