N21.8
BillableOther lower urinary tract calculus
Other lower urinary tract calculus
Coding Notes
Includes
Conditions included under this code
- calculus of lower urinary tract with cystitis and urethritis
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
Related Codes(3)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(17)
SNOMED CT
Clinical Terms
- VUJ - Vesicoureteric junction calculus
- Vesicoureteric junction calculus
- Ureteric calculus
- Ureterolithiasis
- Ureteric stone
- Ureteral stone
- Ureteral calculus
- Calculus of ureter
Frequently Asked Questions
What is the ICD-10 code for other lower urinary tract calculus?
The ICD-10-CM code for other lower urinary tract calculus is N21.8. The full clinical description is "Other lower urinary tract calculus". N21.8 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code N21.8 mean?
ICD-10-CM code N21.8 represents “Other lower urinary tract calculus”. It is classified under Chapter 14: Diseases of the Genitourinary System and is a billable/specific code that can be used on a claim.
Is N21.8 a billable code?
Yes, N21.8 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is N21.8 in?
N21.8 is in Chapter 14: Diseases of the Genitourinary System (codes N00-N99).
What SNOMED CT codes does N21.8 map to?
N21.8 maps to 2 SNOMED CT concepts: 31054009, 301792001. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for N21.8?
N21.8 is linked to 1 UMLS Concept Unique Identifier: C0156266. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does N21.8 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like other lower urinary tract calculus affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of N21.8?
N21.8 maps to the ICD-11 code: GB71.Z (Calculus of lower urinary tract, unspecified).
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.