Cigna Allegiance MRF flaw

[dgolden]

Just sharing a heads-up that the optional but important field billing_code_modifier is misnamed in the In-Network MRF in the most recent monthly release. In particular this was encountered in https://AllegianceCostTransparency.com/1001/innet/2022-10-01_allegiance_in-network-2.json.gz

This field is incorrectly named in the plural: billing_code_modifierS
The CMS Validator did not catch this error.

Keyark caught this error because our load process includes enhanced checking, going beyond the baseline checks provided by the CMS Validator. In addition to verifying that only JSON fields names in the spec exist, we generate basic statistics, such as counts of distinct EIN, NPI and billing codes by type, to quickly gauge the completeness of the MRF.