N28.1 Cyst of kidney, acquired
The ICD-10-CM code for Cyst of kidney, acquired is N28.1 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- N25-N29: Other disorders of kidney and ureter (N25-N29)
- Category N28
- 12 codes (10 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to N28.1:
- Cyst (colloid) (mucous) (simple) (retention) › paranephric
- Cyst (colloid) (mucous) (simple) (retention) › kidney
- Solitary › cyst, kidney
- Cyst (colloid) (mucous) (simple) (retention) › peripelvic (lymphatic)
- Cyst (colloid) (mucous) (simple) (retention) › solitary › kidney
- Cyst (colloid) (mucous) (simple) (retention) › kidney › simple
- Cyst (colloid) (mucous) (simple) (retention) › kidney › solitary (single)
- Cyst (colloid) (mucous) (simple) (retention) › kidney › acquired
Inclusion Terms
- Cyst (multiple) (solitary) of kidney (acquired)
U.S. Hospital Utilization
- An estimated 190,650 U.S. inpatient stays in 2023 included N28.1 among the documented diagnoses.
- 1,495 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
CKD staging and code assignment (N18.-)The ICD-10-CM classifies CKD based on severity. The severity of CKD is designated by stages 1-5. Stage 2, code N18.2, equates to mild CKD; stage 3, codes N18.30-N18.32, equate to moderate CKD; and stage 4, code N18.4, equates to severe CKD. Code N18.6, End stage renal disease (ESRD), is assigned when the provider has documented end- stage renal disease (ESRD).
CKD stage plus ESRD: assign N18.6 onlyIf both a stage of CKD and ESRD are documented, assign code N18.6 only.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026