O40 vs Z03.7
O40 (Polyhydramnios) compared with Z03.7 (Encounter for suspected maternal and fetal conditions ruled out), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. O40 carries an Excludes1 note covering Z03.7: “encounter for suspected maternal and fetal conditions ruled out (Z03.7-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. Z03.7 carries an Excludes1 note covering O40: “known or suspected fetal anomalies affecting management of mother, not ruled out (O26.-, O35.-, O36.-, O40.-, O41.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| O40Polyhydramnios | Z03.7Encounter for suspected maternal and fetal conditions ruled out | |
|---|---|---|
| Billing status | Non-billable header Report instead: O40.1XX0, O40.1XX1, O40.1XX2, O40.1XX3, O40.1XX4 | Non-billable header |
| Classification | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) |
| Definition | Polyhydramnios is a non-billable ICD-10-CM category code (O40). | Encounter for suspected maternal and fetal conditions ruled out is a non-billable ICD-10-CM category code (Z03.7). |
| 7th character | One of the following 7th characters is to be assigned to each code under category O40. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O40 that has a 7th character of 1 through 9. | — |
| Includes | hydramnios | Encounter for suspected maternal and fetal conditions not found |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources