X12 837P SV105 Field Guide: Place of Service Values and Common Mistakes
Most 837P claims never populate SV105 at all, because the claim-level place of service already applies — but the moment a claim mixes settings, like a lab draw billed from an office visit encounter, leaving SV105 blank silently applies the wrong facility type to that one line.
SV105 is an optional line-level Place of Service Code in an X12 837P service line — it overrides the claim-level place of service (carried elsewhere in the claim) for this specific procedure only, when a claim includes services delivered in different settings.
Valid code values
Example
SV105 is left blank here, so this line inherits the claim-level place of service rather than overriding it. Synthetic claim data.
Where this trips people up
Place of service directly affects fee schedule pricing — the same CPT code often reimburses differently in a facility setting than a non-facility one — so a test claim that mixes settings but leaves every SV105 blank never exercises the payer's facility-versus-non-facility pricing logic, and that gap only surfaces once a real mixed-setting claim underpays in production.