RIDDOR Occupational Disease Reporting: When Must Employers Notify HSE?

Riddor occupational disease reporting is triggered by a qualifying medical diagnosis and the relevant connection with work, not simply by an employee being unwell. For employers, the starting point is a written diagnosis from a registered medical practitioner. The disease must then meet the applicable reporting criteria, including any specified work activity or occupational exposure.

A diagnosis of dermatitis, asthma or a repetitive strain condition does not automatically require a report. Equally, an employee can have a reportable occupational disease without taking a single day off. The decision depends on the diagnosis, the work undertaken and the legal category, rather than the length of sickness absence.

A common administrative gap is that HR receives a medical letter while the person managing workplace exposure never sees the information needed to assess reporting. Employers need a route for reviewing relevant diagnoses promptly, with appropriate medical confidentiality.

When Does an Occupational Disease Diagnosis Become Reportable?

The Reporting of Injuries, Diseases and Dangerous Occurrences Regulations 2013 apply in Great Britain. Northern Ireland has separate reporting legislation and arrangements, so employers operating across the UK should not assume the same process applies everywhere.

For occupational disease reporting requirements in Great Britain, distinguish between the specified diseases and activities under regulation 8, and occupational cancers and diseases attributable to biological agents under regulation 9. These categories have different tests. A general statement that an illness is work-related does not replace those tests.

For the specified diseases, the reporting decision should establish:

• Whether a registered medical practitioner has provided a written diagnosis of the relevant disease.
• Whether the person’s work involves the activity or exposure specified for that disease.
• Whether the available information supports the required relationship between the disease and work.

HSE describes reportable occupational diseases as conditions likely to have been caused or made worse by work. Employers should apply that principle alongside the actual disease and activity criteria, rather than treating it as an open-ended requirement to report every illness affected by employment.

For example, diagnosed carpal tunnel syndrome in someone who regularly uses vibrating tools presents a different reporting question from the same diagnosis in someone whose work consists solely of keyboard use. Both employees may need adjustments and a review of their work, but the specified RIDDOR activity is not the same.

Do not make a reportability decision from the job title alone. A facilities technician may spend most of the week inspecting premises but regularly use breakers during maintenance. A cleaner may have relatively short shifts yet experience frequent exposure to detergents and wet work. Establish what the employee actually does, including occasional duties that recur.

The employer does not need to decide civil liability before reporting. A RIDDOR notification is a statutory report, not an admission of negligence. Waiting for an insurer to agree liability or for an internal investigation to establish blame can delay a report that is already due.

What Counts as a Written Medical Diagnosis?

For an employee, the diagnosis must come from a registered medical practitioner. This may be a GP, a hospital specialist or an occupational health doctor. A written occupational health report can therefore provide the necessary diagnosis, but the phrase “occupational health” on a document does not by itself establish that a doctor has diagnosed a reportable condition.

Understanding riddor occupational disease reporting helps employers recognise when work-related ill health must be reported to the enforcing authority.

Further guidance can be found in the HSG274 hot and cold water systems guidance.

Screening results, symptom questionnaires and assessments by other health professionals can identify a problem and justify referral. They are not automatically equivalent to the medical diagnosis required for reporting. Check who issued the document and what it actually concludes.

There is no requirement for a particular RIDDOR diagnosis certificate. A letter or medical report may be sufficient if its content establishes the diagnosis. A fit note may also provide relevant evidence, although many fit notes contain too little detail to resolve the reporting question.

Compare wording such as “hand discomfort, investigation ongoing” with a confirmed diagnosis of hand-arm vibration syndrome. The first records symptoms or uncertainty. The second identifies a disease for which the employer must examine the specified work exposure.

The medical practitioner does not have to write “reportable under RIDDOR” before the employer can act. Deciding whether to submit the statutory report remains the responsible person’s duty. Medical advice establishes the clinical position; workplace information establishes the activities and exposures against which that position must be assessed.

If a document is unclear, obtain focused clarification rather than asking for the employee’s entire medical history. Useful questions include:

• Is this a confirmed diagnosis or a suspected condition awaiting investigation?
• What disease has been diagnosed, rather than what symptoms have been reported?
• Is work considered a likely cause or aggravating factor?
• What restrictions or exposure changes are advised while the position is reviewed?

Where clinical clarification is needed, provide the doctor with an accurate description of the work through an appropriate, confidential process. “General maintenance” tells a clinician much less than the tools used, time spent using them and available vibration exposure information.

Self-employed people have a specific distinction to consider: HSE guidance accepts a doctor’s verbal diagnosis as sufficient to trigger their reporting obligation where the relevant criteria are met. Employers should not apply that exception to employee cases.

Medical information is special category personal data. Restrict access, establish appropriate data protection grounds for processing it and share only what is necessary. Supervisors usually need to know the employee’s restrictions and the controls required, not unrelated clinical details.

For riddor occupational disease reporting, check that a doctor’s written diagnosis and the employee’s work activities meet the relevant reporting criteria.

Matching Reportable Diseases to the Specified Work Activities

The regulation 8 list of RIDDOR reportable diseases is narrower than the full range of illnesses that work can cause. The disease name and the specified activity must be considered together. These examples illustrate the reporting tests; they are not findings from particular workplaces.

Carpal tunnel syndrome is reportable where the person’s work involves regular use of percussive or vibrating tools. A diagnosis in a maintenance worker regularly using impact equipment therefore needs prompt assessment against that criterion. Carpal tunnel syndrome associated only with computer work does not satisfy this particular activity description, even if the workstation still requires attention.

Cramp in the hand or forearm is reportable where work involves prolonged periods of repetitive movement of the fingers, hand or arm. Repetitive assembly or intensive manual tasks may be relevant. Ordinary tiredness or an employee saying their hands ache after a shift is not the same as a doctor’s diagnosis of the specified condition.

Occupational dermatitis is reportable where work involves significant or regular exposure to a known skin sensitiser or irritant. Relevant exposures can include cleaning chemicals, cement, certain oils and repeated wet work. The assessment should examine the substance and the way it contacts the skin, rather than relying only on whether a product carries a prominent hazard pictogram.

For example, a cleaner diagnosed with occupational dermatitis who regularly handles irritating cleaning solutions may meet the reporting criteria. An employee with a skin condition unrelated to workplace exposure does not become reportable merely because cleaning products are stored in the building.

Occupational dermatitis reporting should also prompt a review of glove selection, contamination inside gloves, handwashing arrangements and opportunities to remove contact with the irritant. Supplying more gloves without understanding the exposure route may leave the problem unchanged.

Hand-arm vibration syndrome is reportable where work involves regular use of percussive or vibrating tools, or holding materials subjected to percussive processes or processes causing vibration. The latter point matters for workers holding components against vibrating machinery, not only those holding powered tools.

A vibration assessment may be on file while the tool inventory is out of date. A new grinder, different consumable or changed work pattern can make old exposure estimates unreliable. Compare the diagnosed employee’s actual duties with the assessment rather than assuming the document settles the question.

Occupational asthma is reportable where work involves significant or regular exposure to a known respiratory sensitiser. Examples can include flour dust, wood dust and isocyanates in relevant products and processes. Product information, process knowledge and competent occupational hygiene advice may be needed to identify the exposure correctly.

Occupational asthma reporting requires more than observing that an employee with asthma works in a dusty environment. A diagnosis of occupational asthma and the specified sensitiser exposure need to be established. Pre-existing asthma aggravated by non-sensitising dust may still demand substantial workplace controls, but it should not automatically be placed in this reporting category.

Tendonitis or tenosynovitis of the hand or forearm is reportable where work is physically demanding and involves frequent, repetitive movements. Repeated forceful gripping during production or packing can be relevant. A diagnosis affecting a different body area, or a vague description such as “repetitive strain injury”, needs careful review rather than automatic classification.

Several distinctions help prevent errors across these categories:

• The specified body area matters where the regulation identifies one.
• “Significant or regular exposure” should not be rewritten as requiring both significant and regular exposure.
• A disease can require reporting even where the employer believes its existing controls are adequate.
• Symptoms warrant action and assessment, but do not themselves establish a reportable diagnosis.

Where the medical terminology differs from the reporting category, ask the diagnosing practitioner to clarify the relationship. Managers should not translate a broad musculoskeletal diagnosis into tendonitis, or a general breathing complaint into occupational asthma, without appropriate medical evidence.

Clear internal procedures for riddor occupational disease reporting help managers gather the necessary information and submit reports without delay.

Occupational Cancers and Diseases Caused by Biological Agents

Regulation 9 addresses diagnosed cancers attributed to occupational exposure to a known human carcinogen or mutagen, including ionising radiation. It also addresses diseases attributed to occupational exposure to a biological agent. These provisions extend beyond the six disease and activity pairings above.

Occupational cancer reporting requires an occupational attribution. A cancer diagnosis in an employee who has worked around hazardous substances is not enough on its own. The medical and exposure information must support the connection with a relevant carcinogen or mutagen.

Examples that may require consideration include mesothelioma attributed to occupational asbestos exposure, or a cancer attributed to workplace exposure to another recognised human carcinogen. Employers should not attempt to make that clinical attribution themselves.

Latency creates practical difficulties. Relevant exposure may have occurred years before diagnosis, under different management or during earlier employment. Do not rule out reporting simply because today’s process appears well controlled. Equally, do not assume the current employer caused the disease solely because the diagnosis arrived during current employment.

Employment status at diagnosis and historical exposure can affect the reporting position. Where a diagnosis concerns a former employee, a retired person or exposures across several employers, obtain case-specific advice on the applicable duty rather than applying the current-employee process without checking.

For biological agents, the question is whether the diagnosed disease is attributable to occupational exposure. Potential examples include an infection acquired through laboratory work, occupational contact with infected animals, or work involving a known source of contaminated material.

A worker contracting a common circulating infection does not automatically create a RIDDOR obligation. Employment in a public-facing role, or the fact that several colleagues are ill, does not by itself establish the required occupational attribution. The evidence must connect the disease to occupational exposure, rather than simply to the general possibility of infection.

Review the following information where an occupational infection is suspected:

• The confirmed diagnosis and relevant medical advice.
• The biological agent and any identified workplace source.
• The task, contact or exposure circumstances.
• Any known failure of containment, hygiene or protective measures.
• Other potentially exposed workers who may need advice or assessment.

An exposure incident and a diagnosed disease are different reporting questions. Some incidents involving biological agents can require consideration under dangerous occurrence provisions even before anyone becomes ill. Conversely, a reportable disease can arise without a single identifiable accident.

Why Sickness Absence Alone Does Not Trigger a Disease Report

There is no minimum absence period for an occupational disease report. An employee who remains at work on adjusted duties may still have a reportable diagnosis. Waiting to see whether they take a week off applies the wrong test.

The over-seven-day incapacity rule belongs to work-related injury reporting. It does not turn eight days of sickness absence into a reportable occupational disease. Nor should the injury reporting deadlines be carried across to a disease case.

Work-related ill health is also much broader than RIDDOR’s disease categories. Stress, many back conditions and other health problems may be caused or aggravated by employment without falling within those categories. They can still require risk assessment, preventive action, occupational health input and consideration of reasonable adjustments where applicable.

Consider two contrasting situations. A worker absent for several weeks with work-related stress does not become reportable under the occupational disease provisions merely because of the duration or stated work connection. A worker with diagnosed occupational dermatitis and qualifying exposure may require a report despite having no absence.

An absence system can therefore support reporting, but cannot determine it. A sickness code such as “skin problem” is too broad to establish a diagnosis. Recording an occupational health referral as “case closed” is also misleading if nobody has reviewed the resulting medical report.

Keep the statutory reporting decision separate from the decision about protecting the employee. “Not reportable” is not a finding that the workplace is safe or that no further action is necessary.

Who Must Submit the Report, How and When?

For an employee’s occupational disease, the employer normally has the reporting duty. Self-employed people generally report their own qualifying cases. A manager, health and safety adviser or consultant may complete the submission on behalf of the responsible person, but assigning the task does not remove the underlying responsibility.

In agency and contracted working arrangements, establish the employment relationship and identify the responsible person. The organisation controlling the workplace may hold the exposure information while another organisation employs the worker. Those parties need to exchange the relevant facts promptly rather than assume someone else has reported.

A landlord or managing agent is not automatically responsible for reporting every contractor’s occupational disease simply because the work took place in their building. They may nevertheless need to provide records, address risks under their control and cooperate with the employer’s investigation.

Use HSE’s online RIDDOR reporting service and select the appropriate disease report form. HSE disease reporting arrangements channel information to the relevant enforcing authority; HSE is not the enforcing authority for every workplace.

Submit the report without delay once the qualifying diagnosis and reporting criteria are established. Do not wait for the next safety committee meeting, the employee’s return to work or completion of the full exposure investigation. The familiar 10-day and 15-day periods associated with certain injury reports are not a waiting period for occupational disease notification.

Before submitting, assemble enough reliable information to describe the case accurately:

• The employer and workplace details.
• The affected person’s details and employment status.
• The diagnosed disease and relevant diagnosis information.
• The work activity, substance, tool or biological exposure involved.
• The factual basis for considering the condition occupational and reportable.

Distinguish confirmed facts from matters still being investigated. Do not invent an exposure date where the disease developed over time or suggest that a suspected source has been proven. Retain the submitted information and reporting acknowledgement so the organisation can demonstrate what was reported and when.

If a qualifying diagnosis was received earlier but overlooked, address the reporting position promptly. Record the actual chronology and correct the internal process. Do not substitute a later review date for the date the employer first received the medical information.

Recording the Decision and Reviewing Workplace Controls

Keep the required RIDDOR record for at least three years from the date it was made. A retained copy of the report can form part of that record. Other records may have much longer retention requirements: certain COSHH health records, for example, must be retained for at least 40 years. Do not use the RIDDOR minimum as a universal disposal date.

Where a diagnosis is assessed as not reportable, a proportionate decision note is sensible management practice. This is distinct from claiming that every non-reportable illness requires a statutory RIDDOR record.

The note should identify the diagnosis information considered, the relevant work activities, the reporting category checked, the decision and any outstanding clarification. Give someone ownership of unresolved questions. “Awaiting occupational health” should have a named action owner and follow-up date.

The wider health and safety legislation remains relevant regardless of reportability. Duties under the Health and Safety at Work etc. Act 1974, the Management of Health and Safety at Work Regulations 1999 and hazard-specific regulations require employers to assess and control risks, not merely report outcomes.

A diagnosis should trigger a review of the relevant assessment and controls. Depending on the hazard, that may involve substituting a substance, changing equipment, reducing exposure, improving extraction, redesigning repetitive tasks or obtaining specialist exposure measurements. Protective equipment should not be treated as the automatic first or only response.

Consider colleagues doing comparable work and whether health surveillance is required or needs reviewing. A single diagnosed employee may reveal a wider exposure problem, although it does not prove that everyone undertaking the task has the disease.

Finally, check that the agreed measures happen. A revised COSHH assessment achieves little if purchasing still orders the old product or supervisors continue allocating the same unrestricted task. Set completion dates, verify changes at the workplace and confirm that the employee’s duties reflect the medical restrictions.

If you are an employer or facilities manager facing an uncertain disease reporting decision, Acorn Safety Services (Health & Safety) can provide health and safety consultancy to review the diagnosis against the reporting criteria, identify gaps in exposure information and advise on workplace controls. Contact us to discuss the circumstances, or request a free, no-obligation quote through Get a quote.