The envelope that decides what January costs

It is called the Annual Notice of Change, and plans are required to get it to you no later than 30 September every year. Ten to thirty pages, plain envelope, arriving in the same week as the circulars.

Here is the part I had wrong at my mother's table. I was reading it as a description of her plan, which is what it looks like on the cover. Underneath, it is built as a comparison, showing the figure for this year beside the figure for next year, in two columns, for every term that matters.

Once you know that, the work becomes narrower. The rows where the two columns agree can be passed over, and on my mother's notice the ones that disagreed came to four out of roughly forty.

Those two weeks between the thirtieth and the fifteenth were put there on purpose. They are the reading time, and they are the reason the notice carries a deadline of its own rather than turning up with the enrolment papers.

If you let December the seventh pass without acting, your plan carries on into next year on next year's terms, and there is no telephone call to tell you so. The premium in the right-hand column becomes the premium, the drug list in the right-hand column becomes the drug list, and the pharmacy that came off the network stays off it.

For a good many households that is the correct outcome, and staying put is a perfectly sound answer. It becomes a worse one when nobody has read the columns, because then it has been chosen by an envelope rather than by anybody in the house.

One more line is worth knowing about. A plan is allowed to stop being offered in your county altogether, and if that happens the notice is where it says so. My mother's did not, though a neighbour of hers found out that way two years ago, in October, from a document she had nearly thrown out.

Yesterday I said the furnace in a safe test runs at roughly seventeen hundred degrees. That figure belongs to the one-hour rating. A two-hour test runs hotter, nearer eighteen hundred and fifty, and there are longer ratings above that again.

The point I was making survives it, since the class describes the inside of the box whichever furnace was used. The number I gave was one of several and I printed it as though it were the only one.

This sits outside my trade and I want to be plain about that. I have never worked a health file, I hold no licence that touches Medicare, and I cannot tell you which plan suits you. What I have is a habit of reading comparison documents, and that habit works the same whether the two columns are labelled 2026 and 2027 or dwelling limit and replacement cost.

My mother is eighty-nine and files everything. She had last year's notice and this year's in the same drawer, which is how I worked out what the document was for, sitting on her floor going back and forth between them.

If somebody in your family is on one of these plans and is not the sort to open the post, this is the week to offer. It takes an evening on the telephone with both of you holding the same pages.

Open yours the day it lands, and give it the twenty minutes while the fortnight is still there to spend.