ICD-10-CM > E00-E89 > E20-E35 > E20 > E20.8 > E20.81 > E20.812 E20.812 Autoimmune hypoparathyroidism Billable/Specific Copy Code Copy Description Code First , if applicable, underlying condition such as:autoimmune polyglandular failure (E31.0)Schmidt's syndrome (E31.0)