The seven-year rule came from tax law and covers a small share of what you hold; the records that matter longest prove ownership, condition and terms on a date.
A state license, a board certification, a facility accreditation and a supervision agreement do four different jobs, and only one of them decides who may treat you on a Thursday.
The seven-year rule most households follow answers only one question, and the records that cause real trouble are the ones tied to an asset or a local rule rather than a tax year.
A summary statement, an itemized bill and an explanation of benefits answer different questions, and which one settles a dispute depends heavily on where you were treated.
A routine outpatient procedure produced two separate claims, and the line that decided the balance was a facility fee governed differently in almost every state.
A single course of physical therapy, run twice at two clinics, shows what a plan of care really costs in dollars, hours and workdays, and which decisions move the number.
A course of treatment is priced in stages, not once, and the rules give you more written detail than most clinics offer unprompted. Here is what to ask for and when.