ICD-9-CM Vol. 1 Diagnostic Codes →
7. DISEASES OF THE CIRCULATORY SYSTEM (390-459) →
section notes
OTHER FORMS OF HEART DISEASE (420-429) →
section notes
420 Acute pericarditis →
section notes
420.9 Other and unspecified acute pericarditis →
section notes
420.90   Acute pericarditis NOS
420.91   Ac idiopath pericarditis
420.99   Acute pericarditis NEC
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