Short answer · Medically reviewed summary · Last updated: 2026-05-08
Chronic Kidney Disease (CKD) is classified under ICD-10 code N18, which is further subdivided based on the stage of kidney function decline (N18.1 through N18.9). In the older ICD-9-CM classification system, Chronic Kidney Disease was primarily coded as 585.x, with specific digits indicating the severity of the renal failure. How is Chronic Kidney Disease classified for medical coding? Medical providers use the ICD-10 system to track the progression of Chronic Kidney Disease.
1 people with Chronic Kidney Disease have shared their first-person experience on this question at DiseaseMaps.
ICD10 code of Chronic Kidney Disease and ICD9 code
ICD-10 and ICD-9 codes for Chronic Kidney Disease, with classification details for clinicians, coders and patients.
Chronic Kidney Disease (CKD) is classified under ICD-10 code N18, which is further subdivided based on the stage of kidney function decline (N18.1 through N18.9). In the older ICD-9-CM classification system, Chronic Kidney Disease was primarily coded as 585.x, with specific digits indicating the severity of the renal failure.
How is Chronic Kidney Disease classified for medical coding?
Medical providers use the ICD-10 system to track the progression of Chronic Kidney Disease. The code N18.1 represents Stage 1, while N18.5 denotes Stage 5 (End-Stage Renal Disease). Using the correct code for Chronic Kidney Disease is essential for ensuring that patients receive appropriate insurance coverage for nephrology consultations, dialysis, or transplant evaluations. In the legacy ICD-9 system, 585.6 was specifically designated for end-stage renal disease, reflecting the historical shift toward the current, more granular staging system.
What are the stages of Chronic Kidney Disease?
The staging of Chronic Kidney Disease is determined by the glomerular filtration rate (GFR) and the presence of kidney damage markers, such as albuminuria. The clinical progression is categorized as follows:
- Stage 1 (N18.1): Kidney damage with normal or increased GFR (≥ 90 mL/min/1.73m²).
- Stage 2 (N18.2): Mild decrease in GFR (60–89 mL/min/1.73m²).
- Stage 3a/3b (N18.3): Moderate decrease in GFR (30–59 mL/min/1.73m²).
- Stage 4 (N18.4): Severe decrease in GFR (15–29 mL/min/1.73m²).
- Stage 5 (N18.5/N18.6): Kidney failure (GFR < 15 mL/min/1.73m²), often requiring renal replacement therapy.
Why is accurate diagnosis important for the community?
For the 37 members of the DiseaseMaps community living with Chronic Kidney Disease, understanding these codes helps in navigating healthcare systems. Managing Chronic Kidney Disease involves not just tracking these codes, but also monitoring blood pressure, managing diabetes, and addressing electrolyte imbalances. Early identification of Chronic Kidney Disease through consistent eGFR testing remains the gold standard for slowing disease progression.
Next steps
- Consult your nephrologist to confirm your specific stage of Chronic Kidney Disease and ensure your medical records reflect the correct ICD-10 coding.
- Join the DiseaseMaps.org community to share experiences and coping strategies with others navigating the complexities of kidney health.
- Request a copy of your latest lab results to track your GFR trends over time.
Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding a medical condition.
References
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) - Kidney Disease Statistics
- World Health Organization (WHO) - ICD-10 Version: 2019
- National Kidney Foundation (NKF) - Clinical Practice Guidelines for CKD
- NIH Genetic and Rare Diseases Information Center (GARD)
Posted May 24, 2017 by Karen 2050
