Wiki Vaccination Question

[nicolelynnsteiner@hotmail.com]

I'm coding a Hepatitis A vaccine. Our clinic was out of the child dose for the vaccine so they administered half of an adult dose (which is equal to a child dose). Would I code a half quantity of 90632 (Hepatitis A vaccine, adult dosage, for intramuscular use) or 90633 (Hepatitis A vaccine, pediatric/adolescent dosage- 2 dose schedule, for intramuscular use)?

I'm a new coder and want to make sure I'm coding it correctly. Thanks for any input!