All ICD10 Codes

N21

Non-Billable
ChapterN00–N99
Rankcategory
Official Description

Calculus of lower urinary tract

Use a more specific code (4 billable)
N21.0Calculus in bladderN21.1Calculus in urethraN21.8Other lower urinary tract calculusN21.9Calculus of lower urinary tract, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 14: Diseases of the Genitourinary System (N00-N99).

CH14 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • 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)

Instructional Notes

Includes
  • calculus of lower urinary tract with cystitis and urethritis

Clinical Hierarchy

BillableHas subcodes
CH14Diseases of the genitourinary system (N00-N99)
N20-N23Urolithiasis (N20-N23)
N21Calculus of lower urinary tractNot billable
N21.0Calculus in bladderBillable
N21.1Calculus in urethraBillable
N21.8Other lower urinary tract calculusBillable
N21.9Calculus of lower urinary tract, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to N21:

chapterCH14
Diseases of the genitourinary system (N00-N99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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