These findings are consistent with those from several large studies that indicated that post-COVID incident conditions occur in 20%–30% of patients (6,7), and that a proportion of patients require expanded follow-up care after the initial infection.
https://www.cdc.gov/mmwr/volumes/71/wr/mm7121e1.htm
https://www.cdc.gov/mmwr/volumes/71/wr/mm7121e1.htm