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Real-Time Eligibility: The 270/271 EDI Transaction

Duration: 55 min · Level: Intermediate · Module: 2. Eligibility & Prior Auth Agents · Focus: eligibility, 270/271, EDI, Availity, agent-design

Learning objectives

By the end of this lesson you will be able to explain and apply:

  • HIPAA 270 transaction
  • HIPAA 271 transaction
  • Availity API
  • Coverage parsing
  • Agent workflow

You will then consolidate these ideas in the hands-on lab below.

Why this matters​

Insurance eligibility verification answers a simple question: is this patient covered for this service today? Answering it manually takes 3-8 minutes of hold time.

Overview​

Insurance eligibility verification answers a simple question: is this patient covered for this service today? Answering it manually takes 3-8 minutes of hold time. Answering it via EDI 270/271 transaction takes 0.8 seconds. An eligibility agent checks every scheduled appointment overnight, flags coverage issues before the patient arrives, and eliminates 90% of front-desk insurance calls.

Key concepts​

Key idea

HIPAA 270 transaction: eligibility inquiry; sent by provider to payer; contains: provider NPI, patient member ID + DOB, service type codes (e.g., 30=health benefit plan coverage, 1=medical care)

  • HIPAA 271 transaction: eligibility response; returned by payer; contains: coverage status, deductible amounts, copay, coinsurance, benefits by service type, coverage dates, coordination of benefits (COB)
  • Availity API: Availity is the largest multi-payer real-time eligibility network (1000+ payers); offers REST API wrapper around EDI 270/271; authentication via OAuth 2.0; $0.05-0.15 per transaction
  • Coverage parsing: 271 responses vary significantly by payer; deductible remaining, out-of-pocket max, and benefit-specific copays must be extracted from complex X12 EDI XML; NLP/regex parsing often required for non-standard payer responses
  • Agent workflow: nightly batch job → retrieve scheduled appointments for next 3 days → submit 270 for each patient/payer combination → parse 271 responses → flag issues (inactive coverage, coordination, prior auth required) → route alerts to front desk and scheduling
  • Edge cases agents must handle: terminated coverage effective mid-month, Medicare as secondary payer, dependent on parent's plan (age 26 cutoff), retroactive coverage changes, Medicaid spend-down
Hands-on lab

Design an eligibility agent: write the data schema for a patient appointment record, define the API call to Availity (or mock), parse a sample 271 response to extract active coverage + deductible remaining + prior auth required flags, and define the three escalation paths (active/needs-PA/inactive coverage).

Check your understanding​

Try to recall each answer before expanding it.

Q1. What do you know about HIPAA 270 transaction?

eligibility inquiry; sent by provider to payer; contains: provider NPI, patient member ID + DOB, service type codes (e.g., 30=health benefit plan coverage, 1=medical care)

Q2. What do you know about HIPAA 271 transaction?

eligibility response; returned by payer; contains: coverage status, deductible amounts, copay, coinsurance, benefits by service type, coverage dates, coordination of benefits (COB)

Q3. What do you know about Availity API?

Availity is the largest multi-payer real-time eligibility network (1000+ payers); offers REST API wrapper around EDI 270/271; authentication via OAuth 2.0; $0.05-0.15 per transaction

Q4. What do you know about Coverage parsing?

271 responses vary significantly by payer; deductible remaining, out-of-pocket max, and benefit-specific copays must be extracted from complex X12 EDI XML; NLP/regex parsing often required for non-standard payer responses

Q5. What do you know about Agent workflow?

nightly batch job → retrieve scheduled appointments for next 3 days → submit 270 for each patient/payer combination → parse 271 responses → flag issues (inactive coverage, coordination, prior auth required) → route alerts to front desk and scheduling

References​

  • HIPAA EDI Transaction Set 270/271 — CMS and ASC X12 (2023). CMS.gov Technical Reference

Next: H2.2 Prior Authorization Automation: From Request to Approval →

Part of Module 2: Eligibility & Prior Auth Agents.