ICD-10-CM > I00-I99 > I10-I1A > I1A > I1A.0 I1A.0 Resistant hypertension Billable/Specific Copy Code Copy Description Applicable To Apparent treatment resistant hypertensionTreatment resistant hypertensionTrue resistant hypertension Code First specific type of existing hypertension, if known, such as:essential hypertension (I10)secondary hypertension (I15.-)