ICD-10-CM 2027
ICD-10 code for congenital infection
Infection specific to the perinatal period, unspecified
From the official ICD-10-CM alphabetic index entry “Infection, infected, infective (opportunistic) › congenital”. Page updated September 29, 2026.
About coding congenital infection
The ICD-10-CM code for congenital infection is P39.9 (Infection specific to the perinatal period, unspecified). The official index lists 19 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 congenital infection codes (official index)
- Candida (albicans) P37.5 — Neonatal candidiasis
- cytomegalovirus P35.1 — Congenital cytomegalovirus infection
- hepatitis, viral P35.3 — Congenital viral hepatitis
- herpes simplex P35.2 — Congenital herpesviral [herpes simplex] infection
- infectious or parasitic disease P37.9 — Congenital infectious or parasitic disease, unspecified
- specified NEC P37.8 — Other specified congenital infectious and parasitic diseases
- listeriosis (disseminated) P37.2 — Neonatal (disseminated) listeriosis
- malaria NEC P37.4 — Other congenital malaria
- falciparum P37.3 — Congenital falciparum malaria
- Plasmodium falciparum P37.3 — Congenital falciparum malaria
- poliomyelitis P35.8 — Other congenital viral diseases
- rubella P35.0 — Congenital rubella syndrome
- skin P39.4 — Neonatal skin infection
- toxoplasmosis (acute) (subacute) (chronic) P37.1 — Congenital toxoplasmosis
- tuberculosis P37.0 — Congenital tuberculosis
- urinary (tract) P39.3 — Neonatal urinary tract infection
- vaccinia P35.8 — Other congenital viral diseases
- virus P35.9 — Congenital viral disease, unspecified
- specified type NEC P35.8 — Other congenital viral diseases
Common questions about congenital infection ICD-10 codes
What is the ICD-10 code for congenital infection?
- P39.9 — Infection specific to the perinatal period, unspecified. More specific codes apply when the documentation supports them: P37.5, P35.1, P35.3, P35.2 and others below.
What is the ICD-10 code for candida congenital infection?
- P37.5 — Neonatal candidiasis.
What is the ICD-10 code for cytomegalovirus congenital infection?
- P35.1 — Congenital cytomegalovirus infection.
What is the ICD-10 code for herpes simplex congenital infection?
- P35.2 — Congenital herpesviral [herpes simplex] infection.
What is the ICD-10 code for infectious or parasitic disease congenital infection?
- P37.9 — Congenital infectious or parasitic disease, unspecified.
What is the ICD-10 code for listeriosis congenital infection?
- P37.2 — Neonatal (disseminated) listeriosis.
What is the ICD-10 code for malaria nec congenital infection?
- P37.4 — Other congenital malaria.
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.