Final answer:
The term Urticaria would be found in the International Classification of Diseases (ICD), which is used for diagnosing and coding medical conditions. CPT codes cover procedures like the Expanded Office Visit mentioned in the scenario.
Step-by-step explanation:
The reference manual that would contain the term Urticaria and the associated code is the International Classification of Diseases (ICD). Urticaria, commonly known as hives, would be classified with a specific ICD code that describes the diagnosis. These codes are essential in the medical field as they are used by healthcare providers and insurance companies for documentation, coordination of care, and billing purposes.
Current Procedural Terminology (CPT) codes, on the other hand, would cover the procedure of an Expanded Office Visit as it tracks the services provided by the medical practitioners. The CPT code for an Expanded Office Visit would detail the level of complexity and time spent with the patient.