If the galls look like this

your ID is correct... although there's a possibility of finding another type of midge larva in these galls. According to Gagne: "The active, red larvae leave the galls in late summer or early fall and drop to the ground to overwinter. Larvae of Youngomyia podophyllae (Felt) are occasionally found in these galls . . . Whether Y. podophyllae is a predator or a benign inquiline is unknown." That's all the info that Gagne gives on these galls, but note that the species is impatientis, not impatiens--that may make your information search more successful. You can see some examples of adult gall midges here, but BugGuide doesn't have any that are known to be this species.