Arndell Park: your CTP claim, step by step

There are two main ways to lodge: the Service NSW online form, or the CTP insurer itself. Either way, you'll be asked for the accident date and place, the vehicles involved, your injuries, your employer and income, and the doctors treating you. Most people can complete it themselves in one go if they have the details to hand.

Weekly payments replace part of your income while the injury keeps you off work or on reduced hours. The insurer sets your rate from what you earned before the accident, so give it the full picture from the start: every job you held and the hours you usually worked. A legislated maximum applies and is indexed each year, so the cap itself changes over time.

Your CTP insurer covers treatment and care for accident injuries where it's reasonable and necessary, within whatever benefit period applies to you. That can include doctor visits, physiotherapy, medication and some travel for treatment. The insurer decides each request, and decisions can be reviewed, so ask before committing to large treatment costs.

You don't need a perfect file to lodge. Start with the basics you have, then add documents as they arrive. Insurers generally ask for more information later, and it's better to lodge within 28 days with a gap in the paperwork than to wait for every page and lose back-pay.

• Police event number
• Date, time and place of the crash
• Registration numbers of the vehicles involved
• Your Certificate of Fitness
• Your employer's name and contact details

Plan around the 52-week mark if it applies to you. Keep your Certificates of Fitness current, keep treatment going as your doctor recommends, and ask the insurer in writing what will happen to payments and treatment when the period ends. If you think the threshold decision itself is wrong, you can ask for an internal review, generally within 28 days of receiving it.

Your case manager will ask for updated Certificates of Fitness, may request medical reports and may arrange an assessment with a doctor the insurer chooses. Attend any assessment you're asked to, and keep your own notes afterwards. If you think a decision is wrong, ask for an internal review rather than letting it sit.

• Ask for important decisions in writing
• Keep copies of everything you send
• Ask what a request is for if it's unclear

The Certificate of Fitness is where your medical story meets the insurer. It lists your injuries and says what work, if any, you can do. If a certificate misses an injury or overstates your capacity, weekly payments may not reflect your situation, so read each one before it goes to the insurer and raise anything wrong with your doctor.

If you lodged late, the stakes are higher: claims more than 3 months after the accident are accepted only in limited circumstances. The same goes if you've received a settlement offer or a letter you don't understand. In those situations, an independent lawyer's view is usually worth getting sooner rather than later.