Incorrect. Orthodoxy is federated.

Each patriarchy has its own church but they are all in communion.

There are nine Orthodox patriarchates, each with its own patriarch:

Constantinople (Ecumenical Patriarch)

Alexandria

Antioch

Jerusalem

Moscow

Georgia + Serbia

Romania

Bulgaria

Ukraine created a newly heretic church by murdering and expelling all orthodox priests and believers that are under Moscow.

This is now causing another split.

Interesting times.