productOrService property
productOrService When the value is a group code then this item collects a set of related item details, otherwise this contains the product, service, drug or other billing code for the item. This element may be the start of a range of .productOrService codes used in conjunction with .productOrServiceEnd or it may be a solo element where .productOrServiceEnd is not used.
Implementation
CodeableConcept? get productOrService => throw _privateConstructorUsedError;