How to Prepare a Medical Chronology

A medical chronology is a date-ordered summary of a patient's medical records, usually prepared for a legal case or an insurance claim. Attorneys, paralegals and legal nurse consultants use one to see the course of care without rereading every page, and to find what is missing from the file.

This article covers the practical work of building one. It is not legal or medical advice, and your firm or the court may require a particular format, so check that before you start.

What to include

Most chronologies are a table with one row per encounter. These columns cover what most cases need:

Date of service, with a time if the order of events on one day matters.
Provider and facility.
What happened, such as the complaint, findings, tests, diagnosis and treatment.
Source, meaning the document and page number where the entry can be verified.
Comments, for your own notes on why the entry matters. Keep these apart from what the record says.

Limit the entries to what bears on the case. A personal injury chronology needs the injury and its treatment, plus any earlier history of the same body part or condition. A routine visit about something unrelated can usually stay out.

How to work through the records

Put the records in order. Sort them by date, remove duplicates, and number the pages if they are not already numbered so that every citation points to one place.
List what you have. Note each provider and the dates their records cover. A referral, prescription or follow-up with no matching record is a sign that something still needs to be requested.
Write one entry at a time. Summarize in plain, neutral language, and quote the record when the exact wording matters.
Flag problems as you go. Mark gaps in treatment, conflicting dates, missed appointments and entries you cannot read. These often matter as much as the care itself.
Check it against the records. Compare each date and citation with its source page before anyone relies on the chronology.

How to word each entry

Say what the record says, and attribute it. Compare these two entries:

Too loose: "March 3, 2025: Patient's back was much worse after the accident."
Better: "March 3, 2025: Dr. Lee, Valley Orthopedics. Patient reports low back pain, 7 out of 10. MRI ordered. (Records p. 214)"

The second entry can be checked in seconds, and it leaves the conclusions to the reader. If a date is unclear in the record, say so instead of guessing.

Charting it in Preceden

A table is the usual working document, and Preceden does not replace it. It also does not read records or pull dates out of them, so you enter or import each event yourself. What it adds is a visual timeline, which makes gaps and overlaps easier to see and explain, for example during a case review or mediation.

Create a timeline and name it after the matter, then add each encounter as an event. A few features fit this kind of work:

Notes for the citation. Keep the event's name short, such as "MRI, lumbar spine", and put the details and page number in its Notes field.
Layers for each strand. Add a layer for each provider or type of care, such as "Orthopedics", "Physical Therapy" and "Imaging", so you can see how treatment overlapped and where it stopped.
Date ranges for courses of treatment. Give an event a start and end date to show something like six weeks of physical therapy as a single bar.
Approx. for uncertain dates. Check Approx. next to a date you cannot confirm so the timeline marks it as approximate.
The Bulk Editor or a spreadsheet for long lists. The Bulk Editor lets you add or correct many entries at once. On a paid plan you can also import a CSV or Excel file, which helps if your table already exists, though it needs to be arranged in the columns Preceden expects.

Medical records are sensitive, so before you put patient details into any online tool, including Preceden, check your firm's rules on protected health information. Leaving out identifiers and using a case number for the timeline's name reduces what is exposed.

A timeline you start from scratch is private until you change that. A draft made with Create With AI starts as Secret URL, so anyone with its link can open it. The status next to the timeline's name shows which one applies, and Adjust Timeline Visibility explains each option.

To attach the timeline to a report or bring it to a meeting, save it as a PDF. On a Pro plan, you can also invite a colleague to edit it with you.

The free plan allows up to 10 events on each timeline, and most chronologies need more than that. Our paid plans lift the event limit. If you work on cases regularly, Preceden for legal cases shows how lawyers use it, and How to Write a Timeline for a Court Case covers the wider case timeline.