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Spotlight PEPPOL BIS Billing 3.0 The EU e-invoicing mandate is here — France Sept 2026, Belgium Jan 2026, Germany 2025.

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X12 157 — Notice of Power of Attorney

Notification of a legal power of attorney between a principal and an agent, transmitted to third parties (bank, insurer, government agency).

Purpose

The 157 standardises POA (Power of Attorney) notification in EDI. Emitted by a law firm or the principal directly to third parties that must recognise the agent: banks (for cheque signing), insurers (for claim management), agencies (Medicare, Social Security). Includes the POA scope (durable, limited, springing).

Envelope structure

The 157 travels inside the three X12 envelope levels (ISA/IEA, GS/GE with functional group NP, and ST/SE). Didactic example in 004010:

x12 example-157.x12 
ISA*00*          *00*          *ZZ*LAWFIRM       *ZZ*BANK01        *260516*1900*U*00401*000000157*0*P*>~
GS*NP*LAWFIRM*BANK01*20260516*1900*1*X*004010~
ST*157*0001~
BPA*PA*POA-2026-001*20260516~
NM1*P5*1*DOE*JOHN****34*123-45-6789~
NM1*AT*1*SMITH*JANE****34*987-65-4321~
REF*POA*DURABLE FINANCIAL~
DTM*036*20260516~
SE*6*0001~
GE*1*1~
IEA*1*000000157~

Common segments

  • Header — ST, BPA Beginning of Power of Attorney.
  • Principal — NM1*P5.
  • Agent / Attorney-in-fact — NM1*AT.
  • Scope — REF + NTE.
  • Effective period — DTM*036 start, DTM*037 end.
  • Summary — SE.

Common pitfalls

  • Missing end date: Durable POA is valid until death — specify, otherwise legal ambiguity.
  • Too-generic scope: "All powers" not actionable. Specify the specific acts.
  • Missing notary: in some States, non-notarised POA is rejected by the receiver.

Documentation

The 157 code and the Notice of Power of Attorney name are public and listed at x12.org/products/transaction-sets. The full loops/qualifiers/code-lists structure is distributed by DISA via proprietary Implementation Guides (TR3). ediverse.io covers only public concepts, the envelope and didactic examples.