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
426 Conduction disorders →
section notes
426.5 Bundle branch block other and unspecified →
section notes
426.50   Bundle branch block NOS
426.51   Rt bbb/lft post fasc blk
426.52   Rt bbb/lft ant fasc blk
426.53   Bilat bb block NEC
426.54   Trifascicular block
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