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The connector (bcda.express.cclf / bcda.pipe.cclf) still routed on the v2 near-line RIC code, read v2-only amount columns, and had never run end to end: its contracts named CCLF columns the EOB table does not have, so the runner's exact-match check would have refused every stage. One header stage now carries the v3 semantics. _stg_claim_header drops NotFinalAction claims (9% of the sandbox), derives claim_family from EOB-TYPE → CLM-TYPE-CD → pde_id → RIC (v3 emits the RIC on only some claims), collapses a claim seen in two sources on its claim control number (NationalClaimsHistory/DDPS over SharedSystem, then newest last_updated; rows without a control number are never collapsed) and resolves the MBI. The four family stages are filters on it. One mapping produces input_layer.medical_claim for institutional, carrier and DME lines: admission/discharge from the C4BB admission period, NUBC type of bill (new clm_bill_type_cd on the EOB table; rebuilt as "0" + the three-character v3 frequency code when the coding is missing — the v2 fac+clsfctn+freq concatenation yields "88787J" on v3), MS-DRG, revenue centre, HCPCS + modifiers, attending→operating→rendering / rendering / rendering→ordering NPIs, billing Organization NPI and tax number, paid/allowed/charge/coinsurance/deductible from the consolidated v3 Adjudication amounts, paid date from clm_pd_dt → NCH weekly → CMS process. Part D uses the PDE id, prescribing care-team NPI, contained pharmacy NPI, NDC quantity, total drug cost as charge and paid-by-patient as copayment. Eligibility reads the Part A row (Part B fallback) for status, entitlement and enrollment, the Dual row for dual status, and accepts both CCW sex codes and the FHIR words the v2 flattener passed through. Contracts inherit: header stages subclass ExplanationOfBenefit, outputs subclass aco.table.input_layer.InputLayer*, so downstream pipelines run on BCDA output exactly as on CCLF output. load_bcda(run_pipeline=True), stack load bcda --run-pipeline and stack run bcda land input_layer.*. Large-entity sandbox pull: 221,021 medical lines on 28,282 claims (equal to the FinalAction non-PDE EOBs by type), 11,968 pharmacy rows, 9,582 eligibility rows; all 16 reconciliation checks in the notebook pass. Tests run the whole connector on CMS's official v3 samples through DuckDB. refs #1139