When insomnia is adequately identified as a symptom of another underlying disability, SC should be established for that diagnosis rather than for "insomnia," and the insomnia symptoms should be included in the evaluation for the primary SC disability. A separate evaluation is not warranted for insomnia that is considered secondary to, or a symptom of, another disability. However, SC can be established on a direct basis for "insomnia" in the absence of a known or established underlying etiology if there is an event in service (such as a diagnosis of primary insomnia or insomnia disorder in service) a current diagnosis of insomnia disorder meeting DSM-5 diagnostic criteria a nexus establishing insomnia disorder post service is connected to the event in service, and the condition is not associated with any other disease or injury. Important: A separate SC evaluation for a diagnosis of insomnia disorder is only warranted if all other potential causes are ruled out and SC can be established on a direct basis.

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