On the HSK 2 vocabulary list, at CEFR level A2.

piān ㄆㄧㄢ

    • disk
    • sheet

piàn ㄆㄧㄢˋ

    • thin piece
    • flake
    • a slice
    • film
    • TV play
    • to slice
    • to carve thin
    • partial
    • incomplete
    • one-sided
    • classifier for slices, tablets, tract of land, area of water
    • classifier for CDs, movies, DVDs etc
    • used with numeral 一[yi1]: classifier for scenario, scene, feeling, atmosphere, sound etc
    • Kangxi radical 91

Where 片 is used

Sources