X12 SNIP Validation Levels 1–6 Explained
SNIP is the WEDI framework for testing X12 healthcare transactions. Types 1 to 6 range from EDI syntax and guide compliance through balancing, code-set and payer-specific edits.
Updated 2026-09-30 · 5 min read
What SNIP is
SNIP (Strategic National Implementation Process) is a WEDI framework for validating ANSI X12 healthcare transactions in layers. Each layer assumes the one before it has passed.
Running the layers in order is cheaper than running every check at once: a type 1 syntax failure makes type 4 payer edits meaningless.
| SNIP type | Checks | Typical failure |
|---|---|---|
| Type 1 | EDI standard integrity (syntax, delimiters, envelope) | Segment terminator or element separator wrong |
| Type 2 | Implementation-guide requirement | Missing required segment for the transaction |
| Type 3 | Balancing | Claim charge does not equal the sum of line charges |
| Type 4 | Code-set and situational rules | Value outside an external code list |
| Type 5 | External code sets and payer-specific edits | Payer does not accept the code combination |
| Type 6 | Business and product rules | Claim fails a business rule at the payer |
Types 1 and 2: syntax and guide compliance
Type 1 is pure EDI integrity: the file must open with ISA/GS/ST and close with SE/GE/IEA, with a consistent delimiter set and the control counts matching.
Type 2 applies the implementation guide for the transaction. Requiring, forbidding, or ordering a segment is a type 2 rule.
Type 3: balancing
Balancing checks that amounts agree: claim-level totals against line-level totals, and submitted amounts against their constituent parts.
An 837 that does not balance, or an 835 where paid plus adjustments plus patient responsibility does not equal the submitted charge, fails type 3.
Types 4 to 6: codes, payers, and business rules
Type 4 applies code-set rules, such as whether a diagnosis or procedure code is valid for the date. Type 5 covers payer-specific edits and external code lists. Type 6 is the payer’s own business logic.
Because types 4 to 6 depend on payer policy and code versions, they change more often than types 1 to 3, which are driven by the standard itself.
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Frequently Asked Questions
Type 1 or type 3. Delimiter and envelope errors and balancing mismatches account for a large share of rejections because they are structural and are checked first.
No. Types 1 and 2 are gates for any submission. Higher types matter as payers add edits, so an integration usually runs 1 to 3 locally and leaves payer-specific types to the clearinghouse.
WEDI defines seven SNIP types. Types 1 to 6 cover syntax, guide compliance, balancing, code sets, payer edits, and business rules; type 7 is trading-partner-specific.