ICD10BillableValid for clinical use

ICD-10 Code N20.9: Urinary calculus, unspecified

N20.9 is a billable ICD-10 diagnosis code used to classify Urinary calculus, unspecified in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the genitourinary system (N00-N99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the genitourinary system (N00-N99).

When is it used?

  • May be used when a clinician documents urinary calculus, unspecified in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
14Diseases of the genitourinary system (N00-N99)
block
N20-N23Urolithiasis
category
N20Calculus of kidney and ureter
currentN20

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

UrologistGynecologist

Coverage-related procedures and services

CPT 0349Uhigh
DRUG METABOLISM OR PROCESSING (MULTIPLE CONDITIONS), WHOLE BLOOD OR BUCCAL SPECIMEN, DNA ANALYSIS, 27 GENE REPORT, WITH VARIANT ANALYSIS, INCLUDING REPORTED PHENOTYPES AND IMPACTED GENE-DRUG INTERACTIONS
Source: CMS coverage guidance
CPT 81381high
HLA CLASS I TYPING, HIGH RESOLUTION (IE, ALLELES OR ALLELE GROUPS); ONE ALLELE OR ALLELE GROUP (EG, B*57:01P), EACH
Source: CMS coverage guidance
CPT 81374high
HLA CLASS I TYPING, LOW RESOLUTION (EG, ANTIGEN EQUIVALENTS); ONE ANTIGEN EQUIVALENT (EG, B*27), EACH
Source: CMS coverage guidance
CPT 0423Uhigh
PSYCHIATRY (EG, DEPRESSION, ANXIETY), GENOMIC ANALYSIS PANEL, INCLUDING VARIANT ANALYSIS OF 26 GENES, BUCCAL SWAB, REPORT INCLUDING METABOLIZER STATUS AND RISK OF DRUG TOXICITY BY CONDITION
Source: CMS coverage guidance
CPT 74177high
COMPUTED TOMOGRAPHY, ABDOMEN AND PELVIS; WITH CONTRAST MATERIAL(S)
Source: CMS coverage guidance
CPT 74176high
COMPUTED TOMOGRAPHY, ABDOMEN AND PELVIS; WITHOUT CONTRAST MATERIAL
Source: CMS coverage guidance

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
N20.9

Common synonyms

Urinary calculus, unspecifiedUrinary calculus

Frequently asked questions

Code details

CodeN20.9
SystemICD10
Display nameUrinary calculus, unspecified
ChapterDiseases of the genitourinary system (N00-N99)
BlockUrolithiasis

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
AnuriaCalculus, calculi, calculousCalculus, calculi, calculousStone(s)
See also
Calculus, urinary

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code N20.9 for Urinary calculus, unspecified | HealthAssure