Help with Critical Care Note

There was a patient on acute stroke alert, and was seen by the Neurologists to evaluate the patient. While the patient was in the scanner for a CTA of head and neck her neurological examination remarkably improved. She was alert, fluent and following commands, moved all 4 extremities, and had no sensory deficits.

The provider documented Acute Stroke Response. Suspect patient had transient acute encephalopathy secondary to metabolic imbalance precipitated by GIB in the setting of chronic renal failure/hemodialysis. He recommended MRI w/o contrast once patient is stabilize from GIB perspective

He documented critical care time 39 minutes.

Can I code this as a critical care 99291, and also what diagnosis would I use?
I don't see anything for acute stroke alert/response

Any suggestions would be very appreciative!

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Help with Critical Care Note