N18.31 vs N99.0
N18.31 (Chronic kidney disease, stage 3a) compared with N99.0 (Postprocedural (acute) (chronic) kidney failure), 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 N99.0: “renal failure postprocedural (N99.0)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| N18.31Chronic kidney disease, stage 3a | N99.0Postprocedural (acute) (chronic) kidney failure | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | N00-N99 — Diseases of the Genitourinary System (N00-N99) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Chronic kidney disease, stage 3a is a billable ICD-10-CM diagnosis code (N18.31). | Postprocedural (acute) (chronic) kidney failure is a billable ICD-10-CM diagnosis code (N99.0). |
| Use additional code | code, if applicable, to identify: associated cachexia (E88.A) kidney transplant status (Z94.0) | code to type of kidney disease |
| 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