Final answer:
ICD-9 codes are used across multiple sectors in healthcare, commonly found in medical laboratories and vital records for death certificates, and aiding clinicians, medical coders, billers, and epidemiologists.
Step-by-step explanation:
The question posed pertains to ICD-9 codes, which are an integral part of the health-care management system. These codes are ultimately used across various sectors of the medical field. Specifically, you would likely find an ICD code in a medical laboratory and in health records where they are used by vital-records keepers for recording cause of death on death certificates. Furthermore, clinicians use ICD codes for clinical processes such as ordering laboratory tests and prescribing treatments. In addition, medical coders and billers utilize these codes to facilitate the processing of insurance claims. Epidemiologists also use ICD codes to calculate morbidity and mortality statistics which are vital for public health data assessment.