The veteran sought service connection for a low back disorder after an in-service 1963 back injury and later post-service trauma. The claim had been repeatedly denied, reopened, and reconsidered over many years, with various private physicians and lay witnesses offering opinions that attempted to link the current disability to service. The Board ultimately denied the claim, characterizing favorable medical opinions as speculative and concluding that the more likely cause was a post-service injury.

The Court held that the Board’s own causation conclusion was equally speculative because it lacked objective medical support. Although the Court agreed that some of the favorable private opinions were conclusory and history-based, it emphasized that the Board could not substitute its own ungrounded medical judgment for competent medical evidence. Because the record reflected both in-service and post-service back trauma, but no adequate medical opinion explained the relative contribution of each, the Court vacated the decision and remanded for additional medical development, including examination or independent medical opinion if needed.

Practically, the decision stands for the proposition that when medical causation remains unresolved, VA must develop the record rather than resolve it through Board speculation. It is especially useful in service-connection cases involving competing traumatic events and thin medical rationale.

The Board may not rely on unsupported medical speculation to determine medical causation; where the record is inadequate to resolve the relative effects of in-service and post-service injury, VA must further develop the medical evidence.

If the Board rejects favorable nexus evidence but then fills the gap with its own medical theory, that is reversible error. Black supports remand for a competent medical opinion when causation is not medically resolved.

Black is a strong citation against Board fact-finding that crosses into medical judgment. It also supports requests for additional examination or medical opinion when the file contains competing injury histories and no clinician has addressed the relative causal significance of each event.

Board Medical Judgment

A veteran has a documented in-service back strain and a later civilian work injury. The Board denies service connection by asserting that the later injury is the ‘most probable’ cause, even though no doctor has compared the injuries or addressed aggravation. Black supports remand for proper medical development.

Use Black to challenge Board conclusions that rest on speculation about etiology, especially where the Board discounts favorable opinions as conclusory but then adopts its own unsupported causal explanation. Pair it with the duty-to-assist arguments for a clarifying examination or independent opinion.

Colvin v. Derwinski, Tirpak v. Derwinski