Yes, idem is in the scrabble dictionary

...and is worth 8 points by itself.

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Idem Definition

pronoun

Something that has been mentioned previously; the same.
from The American Heritage Dictionary of the English Language, 4th Edition
The same as something previously mentioned.
from Free Scrabble Dictionary

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Top Words by points

Points

dime

7

2 letter words with IDEM

Points

de

3

ed

3

em

4

id

3

me

4

mi

4

3 letter words with IDEM

Points

die

4

dim

6

med

6

mid

6

4 letter words with IDEM

Points

dime

7

idem

7

Found 12 words in 0.11807 seconds