The Veteran's combined disability rating was increased to 100% effective December 28, 2015 due to a new service-connected condition (right lower extremity neuropathy). The VA retroactive CRDP payment for the period from January 1, 2016 through August 31, 2021 was correctly assigned an effective date of January 1, 2016. The Veteran is not entitled to an earlier effective date for the retroactive CRDP payment.

The Veteran's TBI and other specified trauma disorder are being remanded for further evaluation.,The Veteran's increased rating claim for other specified trauma disorder is also being remanded.,Service connection for ulcerative pancolitis, irritable bowel syndrome, chronic anemia, skin disability (psoriasis), sleep apnea, cervical spine disability, right knee disability, left hip disability, and right lower extremity neuropathy are all being remanded due to the need for additional medical examination and opinion.,The Veteran's service connection claims will be addressed based on his credible history of service in combat zones.

The Board has determined that the Veteran's claims for increased ratings for his service-connected right and left lower extremity neuropathy require additional development due to missing medical evidence, specifically an EMG from June 2023. The VA examinations also did not consider the ameliorative effects of medication on the severity of the disability.

The Veteran's service connection for coronary artery disease (CAD) and gastroesophageal reflux disease (GERD), both due to herbicide exposure, is granted.,Service connection for GERD secondary to PTSD is also granted. The Veteran has left lower extremity neuropathy but no current diagnosis of left upper or right lower extremity neuropathy.

The Board granted service connection for diabetes mellitus, type II and neuropathy of the extremities due to in-service exposure to herbicide agents. The claims for a sinus disorder and facial skin disorder were remanded.