Any other chronic vitamin or mineral deficiency with clinical manifestations (due to starvation)
VA doesn't add ratings together. It combines them using the table in 38 CFR § 4.25, so two ratings usually total less than their sum.
Medical records that document a confirmed diagnosis of avitaminosis form the foundation for any rating. At the 10% level, records showing decreased appetite, unintended weight loss, abdominal discomfort, weakness, difficulty concentrating, or irritability support the diagnosis. For higher ratings, clinical findings become more specific. Records of stomatitis (inflammation of the mouth), achlorhydria (absence of stomach acid), or diarrhea support a 20% rating. Findings of stomatitis, diarrhea, and symmetrical dermatitis together support the 40% level. Mental health evaluations or notes documenting mental symptoms alongside evidence of impaired bodily vigor support the 60% level. For a 100% rating, records would need to show marked mental changes, moist dermatitis, an inability to retain adequate nourishment, exhaustion, and cachexia. Your own statements and those of people who know you describing how these symptoms affect your ability to work, eat, and carry out daily activities can also help show the severity of your condition.
VA exam form (DBQ) for this condition:
If your service meets the rules below, VA presumes this condition is connected to it.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.