I31.4 Cardiac tamponade

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

Code first

• underlying cause

Applies from I31 Other diseases of pericardium

Excludes1 (never code together)

• diseases of pericardium specified as rheumatic (I09.2)
• postcardiotomy syndrome (I97.0)
• traumatic injury to pericardium (S26.-)

MS-DRG index

Defines the logic of DRG(s) 314-316 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 423.3 Cardiac tamponade

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

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to I31.4

Back-references to I31

• Type 1 Excludes: I09.2 Chronic rheumatic pericarditis ("chronic pericarditis not specified as rheumatic (I31.-)")

Diagnosis Index entries for I31.4

• Cardiac › tamponade
• Tamponade, heart

Nearby codes

• I31.1 Chronic constrictive pericarditis
• I31.2 Hemopericardium, not elsewhere classified
• I31.3 Pericardial effusion (noninflammatory)
• I31.31 Malignant pericardial effusion in diseases classified elsewhere
• I31.39 Other pericardial effusion (noninflammatory)
• I31.4 Cardiac tamponade (this code)
• I31.8 Other specified diseases of pericardium
• I31.9 Disease of pericardium, unspecified