R04.81 Acute idiopathic pulmonary hemorrhage in infants

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

Applicable to

• AIPHI
• Acute idiopathic hemorrhage in infants over 28 days old

Excludes1 (never code together)

• perinatal pulmonary hemorrhage (P26.-)
• von Willebrand disease (D68.0-)

MS-DRG index

Defines the logic of DRG(s) 204 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 786.31 Acute idiopathic pulmonary hemorrhage in infants [AIPHI]

Medicare Code Edits (MCE v43.1 (April 2026))

• Pediatric diagnoses (age 0 through 17): Age conflict edit. These diagnoses are clinically expected only in patients age 0 through 17.

Code annotations containing back-references to R04.81

Back-references to R04.81

• Type 1 Excludes: J84.03 Idiopathic pulmonary hemosiderosis ("acute idiopathic pulmonary hemorrhage in infants [AIPHI] (R04.81)")
• Type 1 Excludes: P26 Pulmonary hemorrhage originating in the perinatal period ("acute idiopathic hemorrhage in infants over 28 days old (R04.81)")

Diagnosis Index entries for R04.81

• AIPHI (acute idiopathic pulmonary hemorrhage in infants (over 28 days old))
• Hemorrhage, hemorrhagic (concealed) › acute idiopathic pulmonary, in infants

Nearby codes

• R04 Hemorrhage from respiratory passages
• R04.0 Epistaxis
• R04.1 Hemorrhage from throat
• R04.2 Hemoptysis
• R04.8 Hemorrhage from other sites in respiratory passages
• R04.81 Acute idiopathic pulmonary hemorrhage in infants (this code)
• R04.89 Hemorrhage from other sites in respiratory passages
• R04.9 Hemorrhage from respiratory passages, unspecified