The Medic Corp is a group of some of the best medics in their respective villages. They are mainly responsible for keeping people alive, and in fighting shape in large scale fights. In order to join the Corp you have to have learned the Mystical Palm Technique.

The ranks for Leaf, Sand, and Mist Village's Medic Corp are as follows:
Field Medic: This role is for brand new medics that have recently joined the organization. They have a lot to learn in order to rise up through the Medic Corp's ranks.
Junior Medic: This role is for medic that have basic knowledge of what to do as a medic.
Senior Medic: This role is the last role for your training as a medic, and it shows that you can work effectively in battle.
Paramedic: Paramedics consists of some of the best medics in their respective villages. They posses extraordinary medical ability, and knowledge of what to do in the Battlefield. They focus on more than supporting their teammates.
Doctor: Doctors consists of some of the best medics in their respective villages. Unlike the Paramedic they only focus on supporting their teammates.
Chief Resident: Also known as the co-leader of the Medic Corps, and supports the Medical Director in picking new medics, and promoting.
Medical Director: The Medic Corp Leader. They are responsible for keeping the Medic Corps in check, and talks with the Chief Resident to be on the lookout for new medics, and promoting members.

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The Leaf Medical Coat has a price of 1400 ryo.

The Leaf Medical Hat has a price of 900 ryo.

The Leaf Sterile Mask has a price of 900 ryo.
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Sand Surgical Apron has a price of 1400 ryo.

Sand Surgical Mask has a price of 900 ryo.

Sand Surgical Hat has a price of 900 ryo. [I'm pretty sure it's a bugged at the moment but buy at your own risk!]

[Sand Medical Shirt picture not Available dm Alpha!#1504 to have it added!]
Sand Medical Shirt has a price of 1000 ryo.
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The Mist Medical Coat has a price of 1400 ryo.

The Mist Surgical Mask has a price of 900 ryo.
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The Medic Corp for each village is located in the Hospital for each village [Besides Takumi, and Tanzaku Quarters].

[Credits to @Krisa, @Aesthetic, and @Sensory for all pictures, and ranks shown.]