The Veteran's appeal is being remanded for additional development, including obtaining updated VA treatment records and scheduling a VA examination to evaluate the severity of her right foot and ankle disabilities. The case will also be reviewed to determine if she meets the threshold criteria for a TDIU or if it should be submitted to the Director of Compensation Service under 38 C.F.R. � 4.16(b).

The Board has granted the Veteran's claim for service connection for degenerative changes of the thoracolumbar spine and lumbar spondylosis with multilevel mild and mild-to-moderate neural foraminal stenosis, finding that his back disorder is etiologically related to his active service.

The appeal for a disability rating in excess of 20 percent for degenerative changes of the thoracolumbar spine is dismissed.,Two issues on appeal are remanded: entitlement to an initial disability rating in excess of 30 percent prior to April 23, 2013, and in excess of 50 percent therefrom for obstructive sleep apnea; and entitlement to a total disability rating based on individual unemployability due to service-connected disabilities (TDIU) prior to October 1, 2020.,The issue of an earlier effective date for the award of service connection for obstructive sleep apnea is denied.

The Board has remanded several claims for additional development, including obtaining private treatment records and issuing a supplemental statement of the case (SSOC). The issues include ratings for various disabilities related to TBI, cervical spine, thoracolumbar spine, right shoulder, right knee, left carpal tunnel syndrome, right carpal tunnel syndrome, left thumb sprain, right thumb disability, left hip disability, right hip disability, eye disability, ulnar nerve paresthesias, ankle and wrist disabilities, nausea, constipation, and other conditions.

The Veteran's back disability is being remanded for further development, including obtaining VA treatment records and a VA examination to assess the severity of his service-connected condition.