Damage to the bladder from trauma or surgery that may affect bladder control or function.
Because your bladder injury is rated as voiding dysfunction, the evidence that matters most is whatever shows the type and severity of your voiding problem. For urine leakage or incontinence, medical records or your own statements documenting how many times per day you must change absorbent materials or use an appliance are directly relevant to separating the 20%, 40%, and 60% levels.
For urinary frequency, records showing daytime voiding intervals or a voiding diary that tracks how many times you wake at night to void support the 10%, 20%, and 40% levels. For obstructed voiding, catheterization records, post-void residual measurements, uroflowmetry showing peak flow rate below 10 cc per second, documentation of recurrent urinary tract infections caused by obstruction, or records of stricture dilations help establish the 10% or 30% levels. Statements from you or people who live with you describing how these symptoms affect work, sleep, and daily activities can also help show the frequency and severity of your symptoms.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.