pernicious anemia is treated with injections of vitamin b12 because Symptoms Causes Treatment Vitamin B12 Deficiency in Pernicious
Description
8 Congenital forms of the disease generally present before the age of two

N Z Med J 129 Kotilea K, Quennery S, Decros V, Hermans DA (2014) Successful sublingual cobalamin treatment in a child with short-bowel syndrome

The J code identifies the medication and quantity
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Once absorbed, the body converts it into usable forms of B12 that support DNA synthesis, red blood cell production, and neurological function