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
426.1 Atrioventricular block other and unspecified →
section notes
426.10   Atriovent block NOS
426.11   Atriovent block-1st degr
426.12   Atrioven block-mobitz ii
426.13   Av block-2nd degree NEC
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