Medicare Claims Processing Manual (Pub. 100-04), Ch. 6 § 50.2.3
Beneficiary Liability Billing Instructions
50.2.3 - Beneficiary Liability Billing Instructions
(Rev. 1555; Issued: 07-18-08; Effective Date: 01-01-09; Implementation Date: 01-
05-09)
The SNF shall file a non-payment bill for noncovered Part A services, using condition
code 21 that indicates beneficiary liability. Services that would have been eligible for
Part A benefits in the absence of sanctions cannot be billed as Part B charges. However,
the SNF may directly bill the beneficiary, family members or other third party insurers
for services provided to that beneficiary.