Authorisation denials are rarely appealable after the fact. The only reliable fix is a front-desk process that catches them before the service happens.
Prior authorisation denials have a property that makes them uniquely expensive: they are usually not appealable after the service is rendered. If the authorisation was required and not obtained, most payers will not pay retroactively — and you cannot bill the patient either, in most contracts.
That makes this the one denial category where downstream effort is nearly worthless. The entire fix is upstream.
Step 1: Know which services need it, per payer
There is no universal list. Authorisation requirements differ by payer, by plan within that payer, and they change.
Build and maintain a matrix: service (CPT) × payer × plan type → auth required? Keep it in one place, keep it dated, and assign one person to review it monthly.
The services that most commonly require authorisation:
- Advanced imaging — MRI, CT, PET, nuclear medicine
- Surgical procedures, especially in an ASC or outpatient setting
- Durable medical equipment
- Specialty and infusion drugs
- Behavioral health beyond an initial session allowance
- Physical, occupational and speech therapy beyond a visit threshold
Step 2: Trigger at scheduling, not at check-in
By check-in it is too late — the patient is in the building and the clinical day has started. The authorisation check has to fire when the appointment is booked.
Practically: the scheduling template should not allow certain appointment types to be booked without an authorisation field being populated or explicitly waived.
Step 3: Verify eligibility and benefits, not just eligibility
"Active coverage" is not the same as "this service is covered under this plan." A patient can be perfectly eligible and still have the service excluded, or subject to a visit limit already exhausted.
Check: active coverage, plan type, service-specific benefit, remaining visit allowance, and whether the referring provider is in network.
Step 4: Track the authorisation to the claim
An obtained authorisation that never makes it onto the claim is the same as no authorisation. Capture the auth number, the approved units or visits, the approved date range, and the specific CPT codes it covers.
Then check the claim against it: services beyond the approved units, or outside the date range, deny exactly like unauthorised services.
Step 5: Watch the expiry
Authorisations expire. A patient who reschedules twice can easily fall outside the approved window. Any reschedule should re-check the authorisation date range — automatically, not by memory.
Step 6: Escalate peer-to-peer early
When an authorisation is denied clinically, a peer-to-peer review is often the fastest route — and there is usually a short window to request it. Know each payer's window and who initiates it.
The measurement
Track two numbers monthly:
- Authorisation-related denials as a share of total denied dollars. This should trend to near zero. It is one of the few denial categories where zero is realistic.
- Services rendered without a required authorisation on file. A leading indicator that will move before the denials do.
If either number is not improving after a quarter of front-desk changes, the process is being bypassed rather than followed — and that is a staffing and accountability conversation, not a billing one.
