• The outpatient therapy cap is $1,840 Home health agencies can just resubmit the claim with the KX modifier for payment, CMS instructs in the memo online at www.cms.hhs.gov/transmittals/downloads/R1678CP.pdf. "Claims with KX modifiers shall circumvent the cap rejection in CWF," CMS says. The therapy caps apply only to outpatient Part B therapy, not therapy furnished under a home health plan of care.