Chronic kidney disease, stage 1

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.

Apply this code when documentation confirms kidney damage without a significant decrease in GFR. This often includes patients with persistent albuminuria, microscopic hematuria of renal origin, or imaging evidence of kidney structural abnormalities (e.g., polycystic kidney disease) who maintain a GFR above 90.

• Ensure documentation explicitly states "stage 1 CKD" or provides GFR and evidence of kidney damage consistent with this stage.
• Do not code this if the GFR is below 90, even with kidney damage; a higher CKD stage would be more appropriate.
• Always sequence this code after any underlying cause of the CKD, such as diabetes mellitus or hypertension.