Is O40 a billable ICD-10-CM code?

No. O40 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does O40 sit in the tabular list?

Pregnancy, childbirth and the puerperium (O00-O9A), in the block Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48).

What cannot be coded together with O40?

O40 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

O40

O40 — Polyhydramnios

Non-billable headerICD-10-CM

O40 is a non-billable header ICD-10-CM code for polyhydramnios. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 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.

0: not applicable or unspecified
1: fetus 1
2: fetus 2
3: fetus 3
4: fetus 4
5: fetus 5
9: other fetus

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

encounter for suspected maternal and fetal conditions ruled out (Z03.7-)

Includes

Conditions this code covers.

hydramnios

Other codes that can never be billed with O40

These codes carry an Excludes1 note pointing at O40. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading O40 alone.

Z03.7Encounter for suspected maternal and fetal conditions ruled out

Risk adjustment

O40 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead O40

4 child codes. Green means billable.

Questions about O40

Is O40 a billable ICD-10-CM code?: No. O40 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does O40 sit in the tabular list?: Pregnancy, childbirth and the puerperium (O00-O9A), in the block Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48).
What cannot be coded together with O40?: O40 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.