P39.0 Neonatal infective mastitis

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Excludes1 (never code together)

• breast engorgement of newborn (P83.4)
• noninfective mastitis of newborn (P83.4)

Applies from P39 Other infections specific to the perinatal period

Use additional code

• code to identify organism or specific infection

MS-DRG index

Defines the logic of DRG(s) 791 in MDC 15.

Approximate ICD-9-CM (GEMs)

• 771.5 Neonatal infective mastitis

Code annotations containing back-references to P39.0

Back-references to P39.0

• Type 1 Excludes: N61 Inflammatory disorders of breast ("neonatal infective mastitis (P39.0)")

Back-references to P39

• Type 2 Excludes: P00.2 Newborn affected by maternal infectious and parasitic diseases ("infections specific to the perinatal period (P35-P39)")

Diagnosis Index entries for P39.0

• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › breast (acute) (chronic) (nonpuerperal) › newborn
• Mastitis (acute) (diffuse) (nonpuerperal) (subacute) › infective › newborn
• Mastitis (acute) (diffuse) (nonpuerperal) (subacute) › neonatal (noninfective) › infective
• Newborn (infant) (liveborn) (singleton) › mastitis
• Newborn (infant) (liveborn) (singleton) › mastitis › infective

Nearby codes

• P39 Other infections specific to the perinatal period
• P39.0 Neonatal infective mastitis (this code)
• P39.1 Neonatal conjunctivitis and dacryocystitis
• P39.2 Intra-amniotic infection affecting newborn, not elsewhere classified
• P39.3 Neonatal urinary tract infection
• P39.4 Neonatal skin infection
• P39.8 Other specified infections specific to the perinatal period