Chronic kidney disease, Stage I

This code signifies the earliest stage of chronic kidney disease (CKD), characterized by evidence of kidney damage (e.g., proteinuria, hematuria, or structural abnormalities) with a normal or elevated glomerular filtration rate (GFR) of 90 mL/min/1.73 m² or higher. It indicates persistent kidney dysfunction for at least three months.

Use this code when documentation confirms a diagnosis of CKD Stage I based on persistent markers of kidney damage despite a GFR within the normal range. This often includes findings from urinalysis, imaging studies, or biopsy, even if renal function tests are still optimal.

• Always confirm the GFR and evidence of kidney damage are explicitly documented to support Stage I.
• Do not use this code for acute kidney injury or transient proteinuria without evidence of chronic damage.
• Sequence this code as a secondary diagnosis if the patient is being treated for a primary condition that led to or is complicated by CKD.