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 0 Hypertensive heart and chronic kidney disease with heart failure and stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease
 * Use additional code to identify type of heart failure (I50.-)
 * Use additional code to identify stage of chronic kidney disease (N18.1-N18.4, N18.9)
 * I13.1 Hypertensive heart and chronic kidney disease without heart failure
 * I13.10 Hypertensive heart and chronic kidney disease without heart failure, with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease
 * Hypertensive heart disease and hypertensive chronic kidney disease NOS
 * Use additional code to identify the stage of chronic kidney disease (N18.1-N18.4, N18.9)
 * I13.11 Hypertensive heart and chronic kidney disease without heart failure, with stage 5 chronic kidney disease, or end stage renal disease
 * Use additional code to identify the stage of chronic kidney disease (N18.5, N18.6)
 * I13.2 Hypertensive heart and chronic kidney disease with heart failure and with stage 5 chronic kidney disease, or end stage renal disease
 * Use additional code to identify type of heart failure (I50.-)
 * Use additional code to identify the stage of chronic kidney disease (N18.5, N18.6)

I15 Secondary hypertension

 * Code also underlying condition
 * Excludes1: postprocedural hypertension (I97.3)
 * Excludes2: secondary hypertension involving vessels of brain (I60-I69)
 * secondary hypertension involving vessels of eye (H35.0)
 * I15.0 Renovascular hypertension
 * I15.1 Hypertension secondary to other renal disorders
 * I15.2 Hypertension secondary to endocrine disorders
 * I15.8 Other secondary hypertension
 * I15.9 Secondary hypertension, unspecified

=Ischemic heart diseases (I20-I25)=
 * Use additional code to identify presence of hypertension (I10-I15)

I20 Angina pectoris

 * Use additional code to identify:
 * exposure to environmental tobacco smoke (Z77.22)
 * history of tobacco use (Z87.891)
 * occupational exposure to environmental tobacco smoke (Z57.31)
 * tobacco