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rs63750375(D;D)

From SNPedia
common/normal (actually, a common error normally made by 23andMe; see explanation)
Is agenotype
ofrs63750375
GeneMLH1
Chromosome3
Position37,047,565
mentionedby
Magnitude0
ReputeGood
Geno Mag Summary
(-;CA) 6 Lynch syndrome, pathogenic mutation
(CA;CA) 0 common in clinvar
(D;D) 0 common/normal (actually, a common error normally made by 23andMe; see explanation)

This is commonly reported to 100% normal 23andMe users; if it wasn't an error, it would be an extremely rare mutation.