N21 ICD-10-CM Code: Calculus of lower urinary tract
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
N21Calculus of lower urinary tract
ICD-10-CM diagnosis code · United States clinical modification
Where N21 sits
- 1
Chapter 14
Diseases of the genitourinary system (N00-N99)
- 2
Section
Urolithiasis (N20-N23)
- 3
Category N21
Calculus of lower urinary tract
- 4
Code N21
Calculus of lower urinary tract
Codes under N21
N21 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for N21.
Code first
No “code first” instruction is listed for N21.
Use additional code
No “use additional code” instruction is listed for N21.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for N21.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for N21.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code N21 mean?
N21 is the FY 2027 U.S. ICD-10-CM code for “Calculus of lower urinary tract.”
Is N21 a billable or specific ICD-10-CM code?
No. N21 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is N21 located in ICD-10-CM?
N21 is listed in Chapter 14, Diseases of the genitourinary system (N00-N99), within Urolithiasis (N20-N23) (N20–N23), under category N21, Calculus of lower urinary tract.
What coding notes are listed for N21?
No inclusion terms are listed for N21 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.