ICD-10-CM 2027
ICD-10 code for infection newborn
Infection specific to the perinatal period, unspecified
From the official ICD-10-CM alphabetic index entry “Newborn (infant) (liveborn) (singleton) › infection”. Page updated September 29, 2026.
About coding infection newborn
The ICD-10-CM code for infection newborn is P39.9 (Infection specific to the perinatal period, unspecified). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on P39.9.
Within P39, choose P39.9 (Infection specific to the perinatal period, unspecified) only when documentation doesn't support a more specific option: neonatal infective mastitis (P39.0), neonatal conjunctivitis and dacryocystitis (P39.1), Intra-amniotic infection affecting newborn, not elsewhere classified (P39.2), neonatal urinary tract infection (P39.3), neonatal skin infection (P39.4) and other specified infections specific to the perinatal period (P39.8).
Use an additional code to identify organism or specific infection.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific infection newborn codes (official index)
Common questions about infection newborn ICD-10 codes
What is the ICD-10 code for infection newborn?
- P39.9 — Infection specific to the perinatal period, unspecified. More specific codes apply when the documentation supports them: P37.5, P39.8, P39.3.
What is the ICD-10 code for candidal infection newborn?
- P37.5 — Neonatal candidiasis.
What is the ICD-10 code for urinary tract infection newborn?
- P39.3 — Neonatal urinary tract infection.
Is P39.9 billable?
- Yes. P39.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can P39.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict P39.9 as a principal diagnosis.
Is P39.9 a CC or MCC?
- P39.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.