Final answer:
Option D). The code that indicates familial dysautonomia is 742.81. Familial dysautonomia is a rare genetic disorder that affects the autonomic nervous system. The code 742.81 is used for this condition in medical coding.
Step-by-step explanation:
The code that indicates familial dysautonomia is 742.81.
Riley-Day syndrome, another name for familial dysautonomia, is an uncommon hereditary condition that affects the autonomic nerve system. Because it is inherited in an autosomal recessive fashion, the illness cannot manifest until both aberrant copies of the gene exist. Medical coders use precise codes to identify and categorize ailments, making it easier for them to treat patients. The code 742.81 is specifically used for familial dysautonomia.