Sefer HaMitzvot, Positive Commandments
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היא שצונו שתהיה הנדה טמאה. ומצוה זו כוללת טומאת נדה וכל משפטיה. (מצורע, טהרה משכב ומושב פ"ד):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That is that He commanded us that a menstruant woman be impure. And this commandment includes the impurity of the menstruant woman and all of her regulations. (See Parashat Metzora; Mishneh Torah, Those Who Defile Bed or Seat 4.)