What you have to prove
Qualify via either: (1) FEV1 at or below listed table values (same as COPD), OR (2) three hospitalizations of at least 48 hours each within a 12-month period, at least 30 days apart, for asthma exacerbations.
Medical evidence SSA expects
Emergency department and hospital records showing admission dates and treatment, pulmonary function tests, and documentation of medication regimen including controller medications.
Common misconceptions
Visits to an urgent care or office aren't hospitalizations — SSA counts only inpatient admissions of 48+ hours. Well-controlled asthma with only occasional attacks typically does not qualify.