Is O31 a billable ICD-10-CM code?

No. O31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does O31 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).

O31

O31 — Complications specific to multiple gestation

Non-billable headerICD-10-CM

O31 is a non-billable header ICD-10-CM code for complications specific to multiple gestation. 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 O31. 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 O31 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

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

delayed delivery of second twin, triplet, etc. (O63.2)
malpresentation of one fetus or more (O32.9)
placental transfusion syndromes (O43.0-)

Other codes that can never be billed with O31

These codes carry an Excludes1 note pointing at O31. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading O31 alone.

O02Other abnormal products of conception

Risk adjustment

O31 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 O31

5 child codes. Green means billable.

Questions about O31

Is O31 a billable ICD-10-CM code?: No. O31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does O31 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).