Labour Law

When the Doctor Certifies Sick Leave – but Is Not a Reliable Witness

Certificates of incapacity for work are considered a central piece of evidence in labour law. A recent ruling by the Düsseldorf Regional Labour Court, however, demonstrates that if the evidential value of such a certificate is undermined, the certificate alone is no longer sufficient—even if the treating physician testifies in court. This is particularly relevant in the context of dismissals, where the requirements for full proof of incapacity for work are becoming increasingly precise. This article outlines what courts focus on, highlights common weaknesses, and explains the practical significance of a physician’s testimony.

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By 
Dr. iur. Anton Barrein
 and 
28.01.2026
7:45
A doctor reviews documents at a desk.
A doctor reviews documents at a desk.

What is at stake in this decision?

Certificates of incapacity for work are the statutory evidence of illness-related inability to perform work. In practice, they are considered strong—but not invulnerable—proof.

The Düsseldorf Regional Labour Court had to decide on a claim for continued payment of wages following dismissal. The employee lost the case because the evidential value of their certificate of incapacity for work was undermined, and full proof of incapacity could not be established.

Who should pay particular attention to this ruling?

The decision is especially relevant for:

  • Employers in disputes over continued payment of wages
  • Human resources departments and HR managers
  • Companies dealing with illnesses close to termination
  • Legal representatives in labour law

In short, any situation in which a certificate of incapacity for work is not entirely consistent or uncontested.

The evidential value of the certificate: strong, but challengeable

The court reaffirmed the Federal Labour Court’s case law:

A properly issued certificate of incapacity does not give rise to a legal presumption. Its evidential value may be undermined if actual circumstances cast doubt on the illness.

Timing is particularly critical in cases of dismissal.

Important:
Exact alignment between the notice period and the duration of incapacity is not required. Even minor discrepancies do not prevent the evidential value from being challenged.

Consequences of undermined evidential value

If the evidential value of a certificate is undermined, the certificate alone is no longer sufficient.
The employee must provide full proof of incapacity for work.

In practice, this usually involves:

👉 Evidence through witnesses
👉 Typically: the treating physician

The physician as witness – the critical weak point

The ruling clearly illustrates what courts focus on when evaluating a physician’s testimony.

Key questions include:

  • Does the physician know the employee’s specific duties?
  • Is the sick note based on the physician’s own examination or solely on the patient’s account?
  • How frequent and extensive was the contact?
  • Are the diagnosis, duration, and severity of incapacity plausibly explainable?

If there is a lack of substance, detail, or recall, even a physician’s testimony cannot establish full proof of incapacity.

In the case at hand, the physician failed to meet these requirements.

Practical significance

The decision underscores that wage continuation disputes are no longer merely a formality. Labour courts are increasingly rigorous in their evidential review of incapacity claims—while avoiding excessive demands on the employer’s submissions.

For practice, this means:

  • Illnesses occurring close to termination should be carefully analysed
  • Supporting evidence must be identified and documented
  • Physician testimonies must be realistically assessed and prepared

Practical tip:

Based on multiple physician testimonies, I have developed a structured checklist that allows the reliability of medical statements to be systematically evaluated.

FAQs

When is the evidential value of a certificate of incapacity undermined?

When actual circumstances cast doubt on the illness, such as temporal proximity between dismissal and incapacity, or contradictory employee behaviour.

Is a physician’s testimony always sufficient?

No. The testimony must be substantiated, plausible, and based on the physician’s own examination. Gaps in memory or general statements are insufficient.

Does the employer have to provide counter-evidence?

No. The employer is not required to provide their own medical evidence, only to present circumstances that undermine the certificate’s evidential value.

How important is the physician’s knowledge of the employee’s duties?

It is crucial. If the physician cannot explain why the specific duties could not be performed, the testimony usually lacks the necessary substance.

Why are such cases particularly challenging today?

Because case law now differentiates the evidential value of certificates and clearly defines the requirements for full proof once that value has been undermined.

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Attorney Mr. Anton Barrein
Attorney
Dr. iur. Anton Barrein

Specialist Attorney for Employment Law

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