N25.89 Other disorders resulting from impaired renal tubular function
The ICD-10-CM code for Other disorders resulting from impaired renal tubular function is N25.89 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- N25-N29: Other disorders of kidney and ureter (N25-N29)
- Category N25
- 7 codes (5 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to N25.89:
- Lightwood's disease or syndrome (renal tubular acidosis)
- Lightwood-Albright syndrome
- Water-losing nephritis
- Acidosis (lactic) › kidney, tubular
- Nephropathy › hypercalcemic
- Disease, diseased › Lightwood's (renal tubular acidosis)
- Nephropathy › hypokalemic (vacuolar)
- Acidosis (lactic) › renal (hyperchloremic) (tubular)
Inclusion Terms
- Hypokalemic nephropathy
- Lightwood-Albright syndrome
- Renal tubular acidosis NOS
U.S. Hospital Utilization
- An estimated 11,460 U.S. inpatient stays in 2023 included N25.89 among the documented diagnoses.
- 485 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