Complete loss of lower jaw

Because the single criterion is complete loss of the mandible between its angles, the evidence needs to establish that the bone loss occurred and how far it extends. Diagnostic imaging is the primary way to show this. VA's regulation specifically names conventional X-rays, computed tomography (CT), magnetic resonance imaging (MRI), positron emission tomography (PET), radionuclide bone scanning, and ultrasonography as qualifying imaging studies. Operative and pathology reports from the surgery or trauma that caused the loss can also document what was removed or destroyed.

For the separately rated conditions — such as loss of vocal articulation, smell, taste, neurological damage, or breathing problems — their own evidence requirements apply under whichever diagnostic codes cover those impairments. Statements from you or people who know you describing how the jaw loss affects eating, speaking, and daily life may support the overall record, though the imaging and clinical findings carry the most direct weight for this particular code.