A/B MACs (B) Claim Record for CWF

20.5.1 - A/B MACs (B) Claim Record for CWF (Rev. 3844, Issued: 08-18-17, Effective: 01-01-18, Implementation: 01-02-18) B3-4601.3.B A/B MACs (B) complete the type of service field in the CWF Part B claim record with a “B” if the patient is a high risk screening mammography patient or a “C” if she is a low risk screening mammography patient for services prior to January 1, 1998. For services on or after January 1, 1998, the type of service field on CWF must have a value of “1” for medical care (screening) or a “4” for diagnostic radiology (diagnostic). Fill in POS. Fill in deductible indicator field with a “1”; not subject to deductible if screening mammography. Submit the claim to the CWF host. Trailer 17 of the Part B Basic Reply record will give the date of the last screening mammography. The CWF edits for age and frequency for screening mammography. There are no frequency limitations on diagnostic tests.