My therapist says that when a patient comes into his office who has schizophrenia, the patient still has that diagnosis even when his treatment is going well.

Same with bipolar. I am still diagnosed with ultra-rapid cycling bipolar even when my meds regulate my cycling because my bipolar naturally rapid-cycles.

In my worst mood episodes, I can literally cycle every 3 hours. It sounds unbelievable, and I wouldn't believe it unless I'd experienced it.