DUAL for MBSF prior 2015

[atrisovic]

How do I see if there is DUAL eligibility for years prior 2015?

Thank you!

[atrisovic]

This is the header:

BENE_ID,RFRNC_YR,FIVEPCT,EFIVEPCT,COVSTART,CRNT_BIC,STATE_CD,CNTY_CD,BENE_ZIP,AGE,BENE_DOB,V_DOD_SW,DEATH_DT,NDI_DEATH_DT,SEX,RACE,RTI_RACE_CD,OREC,CREC,ESRD_IND,MS_CD,A_TRM_CD,B_TRM_CD,A_MO_CNT,B_MO_CNT,BUYIN_MO,HMO_MO,BUYIN01,BUYIN02,BUYIN03,BUYIN04,BUYIN05,BUYIN06,BUYIN07,BUYIN08,BUYIN09,BUYIN10,BUYIN11,BUYIN12,HMOIND01,HMOIND02,HMOIND03,HMOIND04,HMOIND05,HMOIND06,HMOIND07,HMOIND08,HMOIND09,HMOIND10,HMOIND11,HMOIND12