Does a medical license number change when a healthcare facility downgrades?

No, it does not.

According to the query of the official website of the Health and Wellness Administration, it is known that the license number of a medical institution will not change after it is downgraded, but the validity period of this license will change. The downgrading of a medical institution does not affect the use of its license to hold medical equipment, medicines and other licenses, nor does it affect its ability to continue to engage in medical service activities.