N21 ICD-10-CA category: Calculus of lower urinary tract
N21 isn’t a code on its own. Choose one of the 4 codes beneath it, the one the documentation supports.
Official description
N21Calculus of lower urinary tract
ICD-10-CA · Canada
Codes in N21
N21 isn’t a code on its own. Open the code that matches what the note documents.
Notes for N21
As CIHI prints them, with any note N21 takes from the headings above it.
Includes
- With cystitis and urethritis
Excludes
Conditions classified elsewhere.
- Certain conditions originating in the perinatal period (P00-P96)certain infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 14: Diseases of the genitourinary system (N00-N99)
Where N21 sits
- 1ChapterChapter 14: Diseases of the genitourinary system (N00-N99)
- 2Block N20-N23Urolithiasis
- 3Category N21Calculus of lower urinary tract
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is N21 a valid ICD-10-CA code?
No. N21 (Calculus of lower urinary tract) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 4 codes; record the one the documentation supports.
Where is N21 in ICD-10-CA?
N21 sits under N20-N23 Urolithiasis, within Chapter 14: Diseases of the genitourinary system (N00-N99).
What coding notes apply to N21?
ICD-10-CA lists Includes, Excludes notes for N21, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.