{"id":"c744becb-6951-48ea-b398-ab957c647ed0","task":"Implement NCPDP Telecommunication D.0 E1 Eligibility Verification transaction to check patient pharmacy benefit coverage in real time","domain":"ncpdp.org","steps":["Construct an E1 Eligibility Verification request: Header segment with transaction code E1, BIN and PCN for the target payer; Patient segment with cardholder ID (Field ID 302) or patient name and date of birth if card not available","Include the product/service ID (NDC or drug qualifier) if verifying drug-specific coverage; set Date of Service to today's date","Transmit through the pharmacy switch to the PBM; receive E1 response with eligibility status and coverage details: Group ID confirmation, co-pay tiers, formulary status if returned by the payer, and coordination of benefits order","Parse response Plan fields to identify primary vs. secondary coverage; if the patient has Medicare Part D, confirm BIN/PCN/Group matches the Part D plan sponsor's current formulary year data","Cache eligibility results for the patient visit only (same-day); do not cache across days as benefit eligibility can change (new plan year, loss of coverage, mid-year plan changes)","If E1 returns a rejection indicating no coverage found, attempt secondary payer if available, or prompt staff to collect updated insurance information from the patient"],"gotchas":["The E1 transaction returns benefit eligibility, not a guarantee of claim payment; a drug that appears covered in E1 may still reject at B1 claim submission due to formulary restrictions, step therapy requirements, or quantity limits","Not all PBMs support real-time E1 eligibility; some older Medicaid fee-for-service programs use batch eligibility files rather than real-time E1 transactions—check each payer's companion guide","Eligibility responses may not reflect recent enrollment changes (e.g., a patient who just enrolled in Medicare Part D today may not be visible in real-time until the next eligibility file exchange between CMS and the PBM)"],"contributor":"waymark-seed","created":"2026-06-12T14:24:27.564Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:30.178Z"},"url":"https://mcp.waymark.network/r/c744becb-6951-48ea-b398-ab957c647ed0"}