Is P23 a billable ICD-10-CM code?

No. P23 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does P23 sit in the tabular list?

Certain conditions originating in the perinatal period (P00-P96), in the block Respiratory and cardiovascular disorders specific to the perinatal period (P19-P29).

What cannot be coded together with P23?

P23 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

P23

P23 — Congenital pneumonia

Non-billable headerICD-10-CM

P23 is a non-billable header ICD-10-CM code for congenital pneumonia. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

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

neonatal pneumonia resulting from aspiration (P24.-)

Includes

Conditions this code covers.

infective pneumonia acquired in utero or during birth

Other codes that can never be billed with P23

These codes carry an Excludes1 note pointing at P23. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading P23 alone.

A56Other sexually transmitted chlamydial diseases
A74Other diseases caused by chlamydiae
J13Pneumonia due to Streptococcus pneumoniae
J14Pneumonia due to Hemophilus influenzae
J15Bacterial pneumonia, not elsewhere classified
J16Pneumonia due to other infectious organisms, not elsewhere classified
J18Pneumonia, unspecified organism

Risk adjustment

P23 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 P23

9 child codes. Green means billable.

Questions about P23

Is P23 a billable ICD-10-CM code?: No. P23 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does P23 sit in the tabular list?: Certain conditions originating in the perinatal period (P00-P96), in the block Respiratory and cardiovascular disorders specific to the perinatal period (P19-P29).
What cannot be coded together with P23?: P23 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.