Veterans

Suppose you need gall bladder surgery - would VA cover that?

Cancer care? Accidental injury? Illnesses like pneumonia? Cataract surgery or glaucoma treatment? Diabetes? Bowel obstruction

Get a list of what VA does and does not cover, then compare it with Medicare. The Medicare.gov website will be very helpful for that.

If VA does not cover this sort of thing, having Part B Medicare would be very important. Part B isn't going to stick you with a network, or put you through a meatgrinder of referrals and medical necessity reviews for procedures and ancillary services. (such as determining if you really need a surgery or services like Physical Therapy, Rehab for pulmonary or cardiac conditions, etc.

Part B has no networks, so you can receive treatment anywhere in the US. Your providers would probably need to file everything to VA first and then Part B, let VA do their thing, then file to Medicare.