When receiving a pre-financed CESU from your employer or a CSE, and wanting to pay a home service provider in the Paris-Saclay area, there’s a blockage: the provider does not know their NAN code, or worse, they lost it after a change in situation. This is the most common scenario when using CESU for the first time or when changing providers. The CESU NAN code remains the keystone of the entire reimbursement process.
Recovering a lost NAN code after a change of employer or CESU aggregator
A provider who leaves one private employer to work with another, or who switches from one platform (Edenred, Bimpli, Up) to another, retains the same NAN code. This is a point that many overlook: the NAN code is attached to the person, not to the employer or the aggregator.
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The common reflex is to want to re-affiliate with the CRCESU by creating a new file. This is exactly what should not be done. A duplicate affiliation complicates reimbursements and can block the cashing of vouchers for several weeks.
The concrete steps to follow when the code is missing:
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- Go to the personal space of the CRCESU (espacepersonnel.cr-cesu.fr) and use the section “I forgot my NAN code.” If an email address is registered on the account, the code will be sent by email.
- If the email address has changed (moving, change of provider), contact the CRCESU customer service directly by phone or mail to update your contact details before requesting the resend.
- Check old documents: the NAN code is on the initial affiliation letter sent by the CRCESU, as well as on employment contracts and invoices issued for previous employers.
For providers in the Paris-Saclay area looking to understand where to find the NAN code on Paris Saclay Invest, the logic remains the same: retrieve before recreating.
Format and verification of the CESU NAN code: avoid input errors
A technical detail that competing guides rarely mention: the NAN code consists of seven digits followed by an asterisk and a key digit. For example, a valid format looks like 0012345*1. This structure allows distinguishing the NAN from a simple internal file number or an Urssaf identifier.
In practice, input errors on CESU payment platforms often stem from this. The NAN is confused with the Pajemploi number, the Urssaf number of the declarative CESU, or an identifier specific to the aggregator. When the platform rejects the code, two things need to be checked: the presence of the asterisk (often forgotten or replaced by a dash) and the exact number of digits before the key.
If the provider received their code by postal mail, the key is sometimes printed small or separated from the main block. It is recommended to take a photo of the document and keep it in a digital folder. This avoids having to call the CRCESU for every new assignment.
Initial affiliation with the CRCESU: the process for a new provider in Paris-Saclay
When the provider has never been affiliated, the situation is simpler but requires a bit of patience. Affiliation is done directly with the CRCESU, not with the employer or the voucher platform.
The provider must provide their personal details, a bank account number (RIB), and an ID. The CRCESU processes the request and sends the NAN code by postal mail. Feedback on the reception time varies, but it generally takes a few business days to a few weeks depending on the period.
What the private employer can do in the meantime
From the Paris-Saclay employer’s side, one cannot force the affiliation or speed up the process. While waiting for the NAN code, there are two options:
- Pay the provider by another temporary means (bank transfer, check) and switch to CESU once the code is received.
- On certain platforms like Edenred+, the employer can initiate an affiliation request on behalf of the provider, but the latter will still need to validate their personal information.
In any case, the provider retains their NAN code for life, even if they stop working for several months or years. Returning to work does not require new affiliation.
NAN code and declarative CESU: do not confuse the circuits
The declarative CESU (managed by Urssaf) and the pre-financed CESU (cashed via the CRCESU) are two distinct systems with different identifiers. The NAN code exclusively concerns the pre-financed CESU.
A provider declared via the Urssaf declarative CESU has an Urssaf account number, not a NAN code. If this provider starts receiving pre-financed CESUs from another employer, they will also need to affiliate with the CRCESU to obtain their NAN. The two numbers coexist without interference.
This confusion is common among providers who work for multiple families in the Paris-Saclay area, some using the declarative system, others the pre-financed one. Each circuit has its own identifier and its own management platform.
The key point for both employers and providers: before any action, identify whether we are talking about pre-financed or declarative CESU. The NAN code only comes into play in the first case, and the entire recovery or affiliation process goes through the CRCESU, not Urssaf.