ICD-10-CM 2027 diagnosis code
P23Congenital pneumonia
P23 is a header code, so it can't be reported by itself. Choose one of the 9 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About P23
P23 is the ICD-10-CM diagnosis code for congenital pneumonia. It belongs to block P19-P29 (respiratory and cardiovascular disorders specific to the perinatal period) and chapter 16 (certain conditions originating in the perinatal period). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: P23.0 (due to viral agent), P23.1 (due to Chlamydia), P23.2 (due to staphylococcus), P23.3 (due to streptococcus, group B), P23.4 (due to Escherichia coli), P23.5 (due to Pseudomonas), P23.6 (due to other bacterial agents), P23.8 (due to other organisms) and 1 more.
Don't report P23 together with the conditions in its Excludes1 note: neonatal pneumonia resulting from aspiration (P24.-).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under P23
- P23.0Congenital pneumonia due to viral agentBillable
- P23.1Congenital pneumonia due to ChlamydiaBillable
- P23.2Congenital pneumonia due to staphylococcusBillable
- P23.3Congenital pneumonia due to streptococcus, group BBillable
- P23.4Congenital pneumonia due to Escherichia coliBillable
- P23.5Congenital pneumonia due to PseudomonasBillable
- P23.6Congenital pneumonia due to other bacterial agentsBillable
- P23.8Congenital pneumonia due to other organismsBillable
- P23.9Congenital pneumonia, unspecifiedBillable
Coding notes
- infective pneumonia acquired in utero or during birth
- neonatal pneumonia resulting from aspiration (P24.-)
Notes that apply from higher levels
Instructions written at a parent level also apply to P23.
Broader instructions also apply from Chapter 16: Certain conditions originating in the perinatal period.
Codes whose notes reference P23
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about P23
Is P23 billable?
- No. P23 is a header code. Report one of its more specific subcodes instead.