38 CFR 17.3220: Eligibility.

A veteran is eligible to receive items and services described in § 17.3230 if:

(a) The veteran is enrolled under § 17.36 or exempt from enrollment under § 17.37(a) through (c); and

(b) The veteran is otherwise receiving care or services under chapter 17 of title 38 U.S.C. If a VA provider or an eligible entity or provider as defined in § 17.4005 prescribes an item or service for the veteran, the veteran is considered to otherwise be receiving care or services under chapter 17 of title 38 U.S.C.