63 - CLAIM IN PROCESS:
Your claim is being held as: (a) it requires manual assessment or (b) the supporting information must be reviewed. DO NOT SUBMIT A NEW CLAIM, as notification of payment or refusal will appear on a future Statement of Assessment.
As the code says, they just need to manually review. Generally, any payment that is sent with supplemental text claim notes will be held for review.
Here is how to fix common rejection codes: How to Fix Common Alberta Rejection Codes