A label “Diot Siaci” or “Siaci Saint Honoré” appears on your bank statement, without you recalling having subscribed to anything with this entity. The Diot Siaci debit most often corresponds to a health insurance, provident, or collective mutual contribution, set up by your employer or an organization to which you are affiliated.
Understanding its exact nature, amount, and possible steps in case of doubt requires dissecting the functioning of the SEPA mandate that authorizes it and the precise role of this broker in the payment chain.
SEPA Mandate and the Diot Siaci Debit Process
The mechanism that generates the line on your account is based on a SEPA direct debit mandate. This mandate is signed upon your enrollment, sometimes without you being fully aware of it, as it is integrated into the employment documents or a collective affiliation bulletin.
| Mandate Element | What You See on the Statement | What It Means |
|---|---|---|
| Creditor (ICS) | DIOT SIACI or SIACI SAINT HONORE | Identifier of the broker collecting on behalf of the insurer |
| Unique Mandate Reference (RUM) | Alphanumeric code | Number specific to your contract, useful for any dispute |
| Frequency | Monthly (sometimes quarterly) | Corresponds to the periodicity of your health or provident contribution |
| Amount | Variable according to the contract | Employee share of the collective mutual or individual contribution |
The central point: Diot Siaci is not the insurer but the intermediary broker. It collects contributions and then transfers them to the insurance company that bears the risk. This is why the name that appears on your account is not that of your mutual, but that of the broker authorized to manage the collection.
If you wish to delve deeper into the subject, a detailed article explains the Diot Siaci debit on your account and the reasons for its appearance on a statement.
Contracts Involved in a Diot Siaci Debit: Beyond Health Mutuals
The majority of Diot Siaci debits visible on individuals’ bank accounts come from contracts for collective health insurance or provident plans subscribed by the employer. The company chooses a broker to negotiate the guarantees with an insurer, and it is this broker that manages the financial flows.
However, the scope of Diot Siaci goes far beyond employee health coverage. The group also operates on property insurance contracts, professional liability, or life insurance as part of corporate retirement savings plans.
New Types of Contracts Since the Acquisition of NeoTech Assurances
Since the acquisition of NeoTech Assurances in July 2026, Diot Siaci has strengthened its presence in the cyber insurance and technological risks market. Specifically, small and medium-sized digital enterprises or start-ups may now see a Diot Siaci debit related to cyber coverage, rather than a traditional health mutual.
This diversification explains why the label on your statement provides no indication of the exact nature of the contract. The same creditor identifier can cover:
- A collective health mutual contribution for employees of a company
- A provident premium (incapacity, disability, death) subscribed under a branch agreement
- A cyber or technological insurance for a digital company
- An additional retirement savings contract with defined contributions
Verify the Legitimacy of a Diot Siaci Debit in Three Steps
Before considering a dispute, a methodical verification allows you to distinguish a normal debit from a real anomaly. The unique mandate reference (RUM) is your first control tool: it appears on your bank statement and should correspond to a contract you are aware of.
Cross-Check the Amount with Your Pay Slip
If you are an employee, the portion of the mutual or provident contribution deducted directly from your account corresponds to the employee share not deducted from gross salary. Your pay slip normally mentions the total contribution and the employer/employee distribution. If the amount debited by Diot Siaci differs from the indicated employee share, it may be a regularization, a change in guarantee, or an error.
Contact the Right Person
Calling your bank will not resolve anything in most cases, as they do not know the details of the contract. The relevant contacts are, in order:
- Your human resources department, which has the framework contract and can confirm the affiliation
- Diot Siaci directly, via the number or address on your mutual certificate
- The insurer bearing the risk, whose name appears on your specific conditions
If none of these steps identify the debit, you have a thirteen-month period to dispute an unauthorized SEPA debit with your bank. This period, provided for by European regulations, applies when no valid mandate has been signed.
International Dimension and Expansion of the Diot Siaci Group
One rarely mentioned element concerns the geographical reach of the group. Diot Siaci has opened a representative office in Poland, marking an expansion into Central Europe. For detached employees or foreign subsidiaries of French groups, a Diot Siaci debit may therefore be linked to a cross-border collective insurance program.
This configuration is found in companies that centralize the management of their health and provident insurance contracts for all their European locations. The single broker then manages the contribution flows from France, even if the employee works in another country.
A Diot Siaci debit on a French bank account translates in the vast majority of cases to a perfectly legitimate insurance contribution. The difficulty lies solely in the opacity of the bank label, which only mentions the intermediary broker. Finding your RUM, checking your pay slip, and contacting your employer’s human resources are usually sufficient to clarify any ambiguity.
