(a) For persons receiving Title IV-D services, the Title IV-D agency will review the support order for modification every three years:(1) for a TANF case;(2) at the request of either parent for a post-assistance or Medical Assistance-Only case; or(3) at the request of either parent for a case in which the parent has applied for Title IV-D services.(b) After such review and if appropriate, the Title IV-D agency will adjust the support order in accordance with Texas Family Code, §156.401.(c) The Title IV-D agency may review and adjust the support order sooner than three years, if there has been a material change in circumstances of the child or persons affected by the support order as allowed by Texas Family Code, §156.401.