Effective date
The effective date is the day a provider's participation with a payer begins — and the day their claims start being payable. It is not the approval date.
Updated
The effective date is the date from which a payer recognizes a provider under a contract. Claims for services on or after it can be adjudicated normally; claims for services before it generally cannot, however complete and correct they are.
It is not the same as the date an application was approved, the date the provider was hired, or the date they started seeing patients. Those four dates can all differ, and only one of them decides whether a claim is payable. How it is arrived at varies: a commercial payer generally assigns it, while Medicare's is determined by regulation rather than discretion — so it is a date to be looked up per payer rather than negotiated.
In practice
This is the number that turns credentialing from an administrative task into a revenue one. Every day a provider sees patients before their effective date produces claims that will be refused on who rendered the service — and the care was still delivered, the cost still incurred.
Whether any of that is recoverable depends on the payer. Some permit billing for a window before the effective date; Medicare publishes its own rules for retrospective billing, and commercial payers set their own in the contract. Nothing here should be assumed: the rule that applies is the one in that payer's current policy, and it is worth knowing before a start date is set rather than after.
Commonly confused with
- Approval date: The date the payer finished deciding. The effective date can be earlier, later, or the same — it is a separate field, and it is the one claims are measured against.
- Contract date: When the agreement was signed. Participation still begins on the effective date the payer assigns.