Chronic kidney disease, stage 3a

This code represents chronic kidney disease (CKD) where there is a mild to moderate decrease in kidney function, specifically with a glomerular filtration rate (GFR) between 45-59 mL/min/1.73 m$^2$. It indicates a persistent and irreversible decline in the kidneys' ability to filter waste products from the blood.

Use this code when documentation explicitly states a diagnosis of "chronic kidney disease, stage 3a" or "CKD stage 3a," supported by GFR values in the 45-59 range. It is appropriate for patients with established CKD who meet these specific GFR criteria.

• Always confirm the specific CKD stage (3a vs. 3b) based on documented GFR values.
• Code any associated complications or comorbidities, such as hypertension or diabetes, in addition to the CKD.
• Ensure the provider's documentation clearly specifies "stage 3a" and not just "stage 3" to avoid ambiguity.