N18.31 vs O00
N18.31 (Chronic kidney disease, stage 3a) compared with O00 (Ectopic pregnancy), 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 O00: “renal failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.4)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| N18.31Chronic kidney disease, stage 3a | O00Ectopic pregnancy | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | N00-N99 — Diseases of the Genitourinary System (N00-N99) | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) |
| Definition | Chronic kidney disease, stage 3a is a billable ICD-10-CM diagnosis code (N18.31). | Ectopic pregnancy is a non-billable ICD-10-CM category code (O00). |
| Includes | — | ruptured ectopic pregnancy |
| Use additional code | code, if applicable, to identify: associated cachexia (E88.A) kidney transplant status (Z94.0) | code from category O08 to identify any associated complication |
| 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