Table 1.
Stages of CKD.
| ICD-9-CM diagnosis code | CKD disease stage | Corresponding GFR (mL/min/1.73 m2) | Description |
|---|---|---|---|
| 585.1 | 1 | ≥90 with kidney damage | Normal kidney function, but urine findings, structural abnormalities, or genetic trait points to kidney disease |
| 585.2 | 2 | 60–89 with kidney damage | Mildly reduced kidney function, and other findings (as for stage 1) point to kidney disease |
| 585.3 | 3 | 30–59 | Moderately reduced kidney function |
| 585.4 | 4 | 15–29 | Severely reduced kidney function |
| 585.5, 585.6 | 5 | <15 (or dialysis) | Very severe, or end-stage kidney failure (sometimes called established renal failure) |
CKD: chronic kidney disease; GFR: glomerular filtration rate; ICD-9-CM: The International Classification of Diseases, Ninth Revision, Clinical Modification.