Use Service Type Codes to Identify Business Group

Each payer may have different supported service types for eligibility and benefit inquiries. You may visit individual payer site to find supported serviceTypeCode and the serviceTypeCode best to use for the procedure you or your patients are trying to get an estimate of out-of-pocket cost. We recommend you purchase and use the 270 Implementation Guide specs.
Or
List of service type codes you can find on Connect Center >> under Verification >> New Eligibility Request >> drop-down list under Service Information >> Service Type.

If you are not sure what service type code to use, you can use serviceTypeCode “30” for a general Health Benefit Plan Coverage inquiry.

Here is a list of official list from the x12 org.

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NOTE

Only service type codes with Starting date: 09/20/2009 will be active.