Are organizations required to go back and obtain missing elements of the CoP/CfC required documentation for clinical contraindications or medical exemptions obtained prior to the effective date of the interim final rule?

Any examples are for illustrative purposes only. 

Yes. It has been confirmed with CMS that organizations that accepted any clinical contraindication or medical exemption documentation for an eligible individual prior to the Centers for Medicare and Medicaid Services CMS Interim Final Rule (IFR) published on December 28, 2021, are required to retrospectively obtain any of the required missing  documentation.  Organizations that accepted clinical contraindication or medical exemption documentation for an eligible individual AFTER the IFR was published are expected to update the information with the required medical exemption elements as outlined in the IFR.
Examples of required documentation that may be missing include:

• Signing and dating by a licensed practitioner
• Information specifying which of the vaccines are clinically contraindicated
• The recognized clinical reasons for the contraindication
• A statement recommending the staff member be exempt