If you're with Momentum and have Gap cover through them (Guard Risk), you don't need to do anything. Once your medical aid has completed their side of the claim, it is automatically sent through to GAP for further processing.
I'm busy with 2 claims right now so I know this to be true. Two emails arrived this morning from Momentum GapCover to say they're processing the 2 shortfall claims.
Ease of use: 5 Stars
Will they pay all of the shortfalls: TBA.
Out of interest:
Momentum Health was modelled off Discovery more than 2 decades ago.
I was one of their first 4000 or was it 6000 (can't recall now) customers to join when they still called themselves Pulz. Other than the cost of "owning" a medical aid (Tax Deductible), I've been moderately pleased over the years.
Pulz was a medical aid plan launched by Momentum in July 2003 as a joint initiative with Sovereign Health.

History and Evolution
- 2003 Launch: Introduced by Momentum to market its own medical scheme instead of promoting Discovery Health.
- 2004 Growth: Reached over 6 000 members in its first year of operation.
- 2005 Merger: Amalgamated with the National Medical Plan (NMP) to form what is now known as Momentum Medical Scheme.