N21.8 ICD-10-CA code: Other lower urinary tract calculus
N21.8 is the ICD-10-CA code for “Other lower urinary tract calculus” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
N21.8Other lower urinary tract calculus
ICD-10-CA · Canada · Also written N218
Index terms
Entries in CIHI’s alphabetical index that lead to N21.8. Searching the index by the condition the note names is how coders reach this code.
- Calculus, calculi, calculous, suburethral
- Stone(s), urinary (duct) (impacted) (passage), lower tract NEC, specified NEC
- Calculus, calculi, calculous, urinary (duct) (impacted) (passage) (tract), lower NEC, specified NEC
Notes for N21.8
As CIHI prints them, with any note N21.8 takes from the headings above it.
Includes
- With cystitis and urethritisFrom N21 Calculus of lower urinary tract
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 N21.8 sits
- 1ChapterChapter 14: Diseases of the genitourinary system (N00-N99)
- 2Block N20-N23Urolithiasis
- 3Category N21Calculus of lower urinary tract
- 4Valid code N21.8Other lower urinary tract calculus
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
What does ICD-10-CA code N21.8 mean?
N21.8 is the ICD-10-CA code for “Other lower urinary tract calculus” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is N21.8 in ICD-10-CA?
N21.8 sits under N21 Calculus of lower urinary tract, within N20-N23 Urolithiasis, within Chapter 14: Diseases of the genitourinary system (N00-N99).
What coding notes apply to N21.8?
ICD-10-CA lists Includes, Excludes notes for N21.8, 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.