As people said above, it depends on when the hallucinations happen. If you have psychotic episodes during a manic or depressive episode (for me it happens usually in the depressive), it fits the Bipolar criteria IIRC. If it happens when you're "normal," then it probably is a symptom of another disorder, but that doesn't make Bipolar invalid.
Schizoaffective Disorder has two types:
- Bipolar type: there are manic or mixed episodes alongisde depressive episodes
- Depressive type: there aren't manic or mixed episodes but there are depressive episodes
And besides the manic/mixed and/or depressive symptoms, there must be also symptoms that fit the Schizophrenia criteria.
As it has been said too, the medication for Bipolar and Schizoaffective Disorder is almost the same, so if in your country they don't know what Schizoaffective Disorder is and you're diagnosed with Bipolar and/or Schizophrenia, you'll probably take antipsychotics so that will work for psychosis anyway
I hope this helped to clear the things up!
Lana