38 CFR § 17.125 - Where to file claims.
(a) Where VA payment for such services has not been authorized in advance, claims for payment for such health care services provided in a State should be submitted to the VA medical facility nearest to where those services were provided.
(b) Claims for payment for hospital care and outpatient services authorized under § 17.35(a) and provided in Canada must be submitted to Veterans Affairs Canada, Foreign Countries Operations Unit, 2323 Riverside Dr., 2nd Floor, Ottawa, Ontario, Canada K1A OP5.
(c) All other claims for payment for hospital care and outpatient services authorized under § 17.35(a) and provided outside a State must be submitted to the Foreign Medical Program, P.O. Box 469061, Denver, CO 80246-9061.