Final answer:
Commas and apostrophes are the two most common types of punctuation styles used in written communication for letters in the medical office.
Step-by-step explanation:
Two common types of punctuation styles used in written communication for letters in the medical office are:
- Commas: Commas are used to separate items in a list, set off introductory phrases, and indicate pauses in a sentence.
- Apostrophes: Apostrophes are used to show possession or contraction.