VITiếng Việt
ICD-10 Vietnam

N21Calculus of lower urinary tract

Code usage status

Primary diagnosis

Select a more specific code

Apply only when it matches the confirmed diagnosis and the documented clinical record.

Specificity

Do not use N21 directly

Use the most specific code supported by the record.

Chapter XIV
Diseases of the genitourinary system
Group N20-N23
Urolithiasis
Official Vietnamese name
Sỏi đường tiết niệu dưới
Additional WHO coding guidance
Incl.: with cystitis and urethritis

Related N21 codes

N21.0 Primary diagnosis candidate Calculus in bladder N21.1 Primary diagnosis candidate Calculus in urethra N21.8 Primary diagnosis candidate Other lower urinary tract calculus N21.9 Primary diagnosis candidate Calculus of lower urinary tract, unspecified

Clinical record checklist

View coding guide →
  • Confirm that the code matches the final documented diagnosis.
  • Use one primary-diagnosis code and record only relevant additional conditions.
  • Review Ministry indicators, inclusions, exclusions and notes.
  • Do not infer a diagnosis beyond the clinical record.

2026 regulatory basis

Indicators are taken from columns 24–29 of the classification accompanying Circular 06/2026/TT-BYT, cross-referenced with Decision 1849/QĐ-BYT and Official Dispatch 4059/BYT-BH.