The multiplier method: scaling off your damages
The multiplier method is the industry's default approach. It takes your economic damages — medical bills and lost wages — and multiplies that total by a factor generally between 1.5 and 5, chosen based on injury severity, recovery time, and whether any permanent impairment is involved.
The per diem method: valuing each day
The per diem (Latin for "per day") method works differently. It assigns a specific dollar value to a single day of pain and suffering and multiplies that rate by the total number of days of documented recovery, tying the value directly to time rather than to the size of your medical bills.
A genuinely Iowa-specific point: the ceiling moves with severity
For an ordinary Iowa injury case, neither method runs into a cap at all. Medical malpractice is different, and genuinely unusual: Iowa Code § 147.136A sets a $250,000 cap on non-economic damages for ordinary injuries, but a much higher $1,000,000 or $2,000,000 cap for catastrophic injuries — substantial or permanent loss of bodily function, substantial disfigurement, or death. That means the method you use to estimate pain and suffering matters less than correctly classifying the severity of the injury itself, since the applicable cap can differ by a factor of four or eight depending on that classification.
When the per diem method still earns its keep
Below whichever cap applies, the per diem method can still carry real persuasive weight in a case with a long, clearly bounded recovery period, where counting days produces an easy-to-follow number for a jury or an adjuster — sometimes a more compelling story than a multiplier applied to a modest economic damages total.
Neither is required by Iowa law
Both methods remain negotiating tools, not a formula Iowa courts are required to apply. A jury retains discretion to award whatever amount it finds appropriate for pain and suffering — subject to whichever cap tier applies, unless the jury finds the defendant acted with actual malice, in which case neither cap applies at all.