The purpose of the study is to investigate the safety and effectiveness of Alhemo in participants under real-world clinical practice in Japan. Total duration of this study is about 6 years. Participants enrolment will be completed in the first 4 years. The observation period of this study will last for about 2 years for each enrolled participant.

Inclusion Criteria:

• Signed consent obtained before any study-related activities (study-related activities are any procedure related to recording of data according to the protocol).
• The decision to initiate treatment with commercially available Alhemo has been made by the participant/Legally Acceptable Representative (LAR) and the treating physician before and independently from the decision to include the participant in this study.
• Male or female, age above or equal to 12 years at the time of signing informed consent.
• Diagnosis with Haemophilia A (HA) or Haemophilia B (HB).
• Participant who has never been exposed to concizumab or who starts treatment with concizumab within the past 12 weeks at registration.

Exclusion Criteria:

• Previous participation in this study. Participation is defined as having given informed consent in this study.
• Treatment with any investigational drug within 30 days prior to baseline (the starting date of Alhemo treatment).
• Mental incapacity, unwillingness or language barriers precluding adequate understanding or cooperation.
• A history of hypersensitivity to any ingredients of Alhemo.

Participants with haemophilia A or haemophilia B without inhibitors will be be treated with commercially available Alhemo according to routine clinical practice at the discretion of the treating physician.

According to the Novo Nordisk disclosure commitment on novonordisk-trials.com