What is EDI 837?
Also called: 837P · electronic claim format · X12 837
Because the 837 is a HIPAA transaction standard maintained by X12, its structure is not negotiable — which is precisely why a clearinghouse is useful. What varies between payers is not the format but the companion guide: which optional segments they require, how they want secondary payer information sequenced, and which identifiers they accept.
The 837 has matching partners: the 835 returns the remittance, the 277 returns claim status, and the 270/271 pair handles eligibility inquiry and response.
Primary sources
Where "EDI 837" is defined by the bodies that set the rules, rather than by us.
- CMS-1500 claim form standards (opens in a new tab)
National Uniform Claim Committee — Maintainer of the CMS-1500 professional claim form and its data element definitions, plus the provider taxonomy code set.
- Medicare Claims Processing Manual (opens in a new tab)
Centers for Medicare & Medicaid Services — The operative manual for how Medicare claims must be coded, submitted, adjusted and appealed. When a payer policy and a vendor's advice disagree, this settles it.
- CAQH Index: cost of administrative transactions (opens in a new tab)
CAQH — Per-transaction cost of eligibility checks, claim status inquiries and prior authorization, manual versus electronic. The best public evidence for automating front-end work.
Last reviewed August 20, 2026
Related terms
Clearinghouse
A clearinghouse is an intermediary that receives claims from providers, validates and reformats them into each payer's required electronic standard, and routes them onward. It also returns acknowledgements, rejections and electronic remittance advice, acting as the single connection point to hundreds of payers.
ERA
An electronic remittance advice, transmitted as an X12 835 file, is the payer's electronic explanation of how a claim was adjudicated. It reports what was allowed, what was paid, what was adjusted and why — using CARC and RARC codes — and it drives automated payment posting.
CMS-1500
The CMS-1500 is the standard paper claim form used by physicians and non-institutional providers to bill Medicare, Medicaid and most commercial payers. It is maintained by the National Uniform Claim Committee, and its electronic equivalent is the EDI 837P transaction.
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