Front-end validations are the first set of checks 340B ESP performs on pharmacy and medical claim submissions before any data is ingested into the platform. These validations ensure claims include required data fields, meet formatting specifications, and reference eligible entities and products.
What Are Front-end Validations?
Front-end validations take place before ESP accepts a file for processing, whether claims are submitted through the web application. These validations prevent invalid or incomplete 340B claims from entering the system and ensure that data aligns with manufacturer requirements and policies.
Front-end validations are designed to:
Confirm that the NDCs in the submission are in scope of a 340B ESP contract pharmacy policy.
Verify data types, formats, and field lengths.
Confirm that all required fields are present.
Only claims that pass all front-end validations proceed to ingestion and subsequent back-end validations.
Tip: For a detailed list of front-end validation requirements and accepted formats, check out Pharmacy Claims Requirements Data Table and Medical Claims Requirements Data Table.
Types of Front-end Validations
340B ESP front-end validations can be grouped into five categories: Ineligible Products, Invalid Entity, Invalid Data Types, Invalid Data Values, and Missing Data Elements.
Ineligible Products
Front-end checks verify NDCs in the submission are in scope of a 340B ESP contract pharmacy policy.
Claims containing ineligible NDCs are filtered out and not ingested.
Only claims for eligible products proceed.
This does not block other valid claims within the same file.
Covered entities can download the eligible NDC list from 340B ESP NDCs list.
Invalid Entity
ESP verifies whether the 340B ID included in the submission is associated with a 340B registered entity.
Invalid Data Types
These validations ensure that each field follows the required data type and format. Examples include:
Alphabetic characters in numeric fields.
Dates submitted in nonstandard formats.
Values exceeding allowed fields lengths.
Decimal values where decimals are not permitted.
Invalid data types block ingestion, and users are shown the specific fields that need correction.
Missing Data Elements
340B ESP only accepts 340B claims submissions that include all of the required fields.
Missing any required fields results in a front-end validation failure.
ESP displays the exact fields that must be added or corrected.
Only complete claims move forward to back-end validation.
Front-end validations represent the first layer of data quality and compliance checks for submitting claims to 340B ESP. By preventing incomplete, incorrectly formatted, or ineligible claims from entering the system, these validations help ensure that only reliable and compliant data proceeds into ESP. Once claim lines pass front-end validation, they move into ingestion and subsequent back-end validation.
Tip: To see how ESP displays front-end validation outcomes during the submission process, check out Understanding Data Submissions in ESP.
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