Invoice rejections cost NDIS providers time, cash flow, and administrative effort. Understanding the most common rejection reasons and building systematic checks into your billing process is one of the highest-return operational improvements any provider can make.
1. Incorrect NDIS number. A single transposed digit causes an immediate rejection. Always copy NDIS numbers directly from the participant's plan or the myplace portal — never retype them manually. 2. Service delivered outside the plan period. Particularly common around plan rollovers where providers continue delivering services assuming a new plan has been approved when it has not. Always verify the current plan period in myplace before generating invoices. 3. Funding type mismatch. Submitting an agency-managed BPR CSV claim for a plan-managed participant will result in rejection or non-payment.
4. Support item not in the participant's plan. Even if a support item exists in the NDIS Support Catalogue, if it is not registered against that participant's specific plan, the claim will be rejected. 5. Incorrect support item reference number. The NDIS updates the Support Catalogue periodically and item codes change. Using a deprecated item code will cause a rejection. 6. Unit price exceeds the catalogue limit. Every support item has a maximum billable rate. Claiming above that rate — even by a few cents — will be rejected.
7. Duplicate ClaimReference value. Each line in a BPR CSV must have a unique ClaimReference that has not been used in a previous submission. 8. Missing or incorrect cancellation reason code. Short notice cancellation claims require a specific cancellation reason code in the BPR CSV. 9. GST code error. Almost all disability support services are GST-free and require the "P2" GST code.
10. Claiming after the statement period has closed. The NDIS has time limits on how far back you can claim — for most supports, within 90 days of the service delivery date. Older claims will be rejected without exception.
The most effective defence is a pre-submission checklist that validates every line before the BPR CSV is generated. Track your rejection rate as a KPI — a well-run billing function should achieve a rejection rate below two per cent.
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