Do You Need a Medical Certificate to Return to Work? What to Include, Cost, and When to Submit

When returning from leave, your employer may ask you to submit a medical certificate. It is not always legally required, yet many workers wonder why it is requested and what it should say.

This article focuses on medical certificates for return to work—whether they are needed, what they should include, cost, and timing. For the overall return process, see our guide to returning to work.

Is a medical certificate required to return to work?

Japan's Labor Standards Act and Labor Contract Act do not state that a medical certificate is mandatory for return to work. In principle, you are not legally required to submit one.

In practice, many companies require a doctor's opinion or certificate under work rules or leave/return policies. For medical leave, employers commonly request documentation to confirm whether you can work safely.

Why employers request a certificate

• To objectively confirm work readiness
• To consider accommodations (overtime limits, adjusted hours, etc.)
• To align with workers' compensation, sickness benefits, and leave records
• To assess risk of relapse after return

Employers usually request certificates to confirm safe return to work, not to refuse return. However, demands for excessive personal or clinical detail may be problematic.

What should the certificate include?

Required items vary by company. Common fields include:

1. Patient name and date of issue
2. Diagnosis (or chief complaint)
3. Summary of treatment course
4. Current condition (fit for work or with restrictions)
5. Work-related notes (no overtime, commute limits, etc.)
6. Doctor's signature and clinic/hospital name

The most important part is wording on fitness for work—for example, "fit for work" or "fit with accommodations." If your company provides a form, use it to avoid missing fields.

Certificate vs. opinion letter

A medical certificate documents diagnosis and treatment. An opinion letter (often called a fitness-for-work letter) focuses on work accommodations. Some employers say "certificate" but actually want a fitness-for-work opinion. Confirm the required format with HR before requesting it from your doctor.

How to obtain one and typical cost

Request the document from your regular doctor or the clinic you visited during leave. After long leave, contact the last clinic you attended and ask whether they can issue return-to-work paperwork.

• Document fee: often around 3,000–5,000 yen (varies by facility)
• Revisit/consultation fee: may apply if a new exam is needed
• Company-specific form: extra fee possible for lengthy forms

Health insurance generally does not cover certificate fees, so you usually pay out of pocket. Whether the employer reimburses depends on work rules.

When should you submit it?

Timing depends on company policy. Common milestones:

1. 2–4 weeks before planned return: inform HR of your intent
2. 1–2 weeks before return interview: request the document from your doctor
3. At the interview or just before return date: submit the certificate

Issuance can take several days to a week, so contact your doctor early once your return date is set. For urgent cases, ask reception how long issuance takes.

What if you cannot obtain a certificate?

• Discuss deadlines with HR and share expected issuance date
• Ask whether an opinion letter or medical summary can substitute
• Resume treatment and request documentation after reassessment
• If demands are excessive, discuss scope with your doctor

Unapproved absence or false statements can damage trust and complicate return. If paperwork will be late, explain the situation to your employer first.

FAQ

Q. I do not want my employer to know my diagnosis (e.g., depression). What can I do?

You can discuss the scope of disclosure with your doctor. Sometimes a letter can state fitness and accommodations without full diagnostic detail. Employers may still request reasonable information under work rules.

Q. What if the certificate says "not fit for work"?

The doctor's judgment takes priority. You may need continued treatment or extended leave. Ask both your doctor and HR whether partial return (shorter hours, fewer days) is possible.

Q. Is a certificate needed for phased return (gradual return to full hours)?

Depends on company policy. Phased return may require an additional opinion letter describing accommodations.

Summary | Early planning smooths return

A medical certificate is not legally mandatory for return, but many employers require one. Prepare documentation that clearly states fitness and needed accommodations before your return interview. Budget and schedule early, as fees are usually self-paid.

For interviews and phased return, see Returning to Work: Process and Steps.

※This article provides general information and does not reflect individual employment terms, company rules, or medical advice. Confirm handling with HR; discuss certificate content with your doctor.