The NAN code is an identifier assigned by the CESU Reimbursement Center (CRCESU) to each affiliated service provider. Composed of numbers and a key, it conditions access to the collection of pre-financed CESUs. Its loss or lack of knowledge effectively blocks the payment circuit, making it a central element for any professional in personal services.
Format and technical structure of the CESU NAN code
The acronym NAN stands for National Affiliation Number. The CRCESU assigns this code to each service provider, whether they are an employee hired by an individual, a service company, or a representative association.
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Its structure follows a precise format: a sequence of up to seven digits, followed by an asterisk and a key digit (example: 0012345*1). This format remains the same regardless of the provider’s status. Only one NAN code is assigned per person or entity, even if multiple employers pay with pre-financed CESUs.
This uniqueness simplifies tracking on the CRCESU side, but it also means that a lost code cannot be replaced with a new one: the original must be found or requested to be resent.
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To know precisely what the NAN code is and where to find it, several channels exist depending on the provider’s situation.
Affiliation to CRCESU: required documents to obtain your NAN code
The most visible content on the subject merely defines the NAN code. They overlook the gradual tightening of affiliation conditions, particularly for micro-entrepreneurs.
Since the latest updates to the procedure, affiliation to CRCESU for a self-employed person requires several documents:
- A proof of declaration of personal services, usually a NOVA extract confirming that the activity falls within the SAP (personal services) scope.
- An Urssaf document: P0 form or micro-enterprise certificate, proving the legal existence of the activity.
- A bank account statement in the name of the provider and an Insee situation notice complete the file.
This refocusing on verifying the SAP scope before issuing the NAN reflects a desire to limit affiliations outside the scope. A provider whose activity does not strictly fall under personal services will be denied affiliation, and thus the NAN code.
For employees directly hired by an individual, the situation is different. The employer must first register with the Urssaf CESU service (or Pajemploi as applicable). The provider’s affiliation to CRCESU does not exempt the employer from their reporting obligations.
Recovering a lost NAN code: concrete channels
The loss of the NAN code is a common problem. Several recovery paths exist, but all assume that the provider is already affiliated with CRCESU.
The first reflex is to check the initial affiliation letter. The CRCESU sends the NAN code by postal mail after confirming the registration. This letter is often filed away or lost, but it remains the most direct source.
If the letter cannot be found, the login page of the CRCESU website offers a section “I forgot my NAN code”. When an email address is registered on the account, the code is sent back via email. Otherwise, it is necessary to contact the CRCESU customer service, which prolongs the wait time.
The NAN code is also found on common professional documents: employment contract between the provider and their employer, or invoices issued by the provider. These documents constitute a third recovery avenue often overlooked.
Digital collection of pre-financed CESUs and the role of the NAN code
The collection of pre-financed CESUs is gradually becoming digital. Providers now have several channels: online entry via the CRCESU personal space, postal sending of paper titles, or direct allocation for e-CESUs (digital CESUs).
Each of these collection methods is conditioned on holding a valid NAN code. Without this number, no reimbursement can be triggered, whether the title is paper or electronic.
The CRCESU mobile application also allows for depositing CESUs and viewing reimbursements. Again, access requires identification via the NAN code. The generalization of e-CESUs makes this code even more central than when only paper checks were in circulation.
For service or representative structures managing multiple providers, the NAN code of each affiliate must be entered individually. A single character entry error (including the key digit after the asterisk) is enough to block the reimbursement.
Updating your affiliate information with CRCESU
A change of name, business name, or bank details does not alter the NAN code itself. However, the information linked to the affiliate account must be updated with CRCESU for reimbursements to continue being processed correctly.
For a legal entity (company, association), the modification requires sending a supporting document to CRCESU, either by mail or via the online space. Individuals can make certain modifications directly from their personal space.
A point of caution: a poorly processed change of bank details can lead to the rejection of reimbursement transfers without immediate notification. Checking that the update is effective before submitting new titles avoids weeks of delays.
The NAN code remains the pivot of the entire collection circuit for pre-financed CESUs. Its loss slows down payments, its absence prevents affiliation, and its incorrect entry blocks reimbursements. Keeping this number with your current administrative documents (contract, invoices, affiliation letter) remains the simplest precaution to avoid these situations.