N18.31 vs R39.2
N18.31 (Chronic kidney disease, stage 3a) compared with R39.2 (Extrarenal uremia), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. N18.31 carries an Excludes2 note covering R39.2: “extrarenal uremia (R39.2)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. N18.31 carries an Excludes2 note covering R39.2: “prerenal uremia (R39.2)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| N18.31Chronic kidney disease, stage 3a | R39.2Extrarenal uremia | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | N00-N99 — Diseases of the Genitourinary System (N00-N99) | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) |
| Definition | Chronic kidney disease, stage 3a is a billable ICD-10-CM diagnosis code (N18.31). | Extrarenal uremia is a billable ICD-10-CM diagnosis code (R39.2). |
| Includes | — | Prerenal uremia |
| Use additional code | code, if applicable, to identify: associated cachexia (E88.A) kidney transplant status (Z94.0) | — |
| Code first | any associated: diabetic chronic kidney disease (E08.22, E09.22, E10.22, E11.22, E13.22) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources