The main objective is to assess long term tolerability and safety of treatment with oral nintedanib in patients with Progressive Fibrosing Interstitial Lung Disease (PF-ILD) who have complete (and did not prematurely discontinue trial medication in) the phase III parent trial, INBUILD® (trial 1199.247).

Inclusion Criteria:

• Male or female patients who completed the INBUILD® trial as planned and who did not prematurely discontinue blinded treatment.
• Signed and dated written informed consent in accordance with ICH-GCP and local legislation prior to admission to the trial.
• Women of childbearing potential (WOCBP)1 must continue to use highly effective methods of birth control per ICH M3 (R2) that result in a low failure rate of less than 1% per year when used consistently and correctly, as well as one barrier method, for 28 days prior to and 3 months after nintedanib administration. A list of contraception methods meeting these criteria is provided in the patient information

Exclusion Criteria:

• Any disease that may put the patient at risk when participating in this trial. Reconsider carefully all exclusion criteria of the INBUILD® trial. However, patients may qualify for participation even though exclusion criteria may have been met during the course of participation in INBUILD®, if the investigator's benefit-risk assessment remains favourable.
• Patients who must or wish to continue the intake of restricted medications or any drug considered likely to interfere with the safe conduct of the trial
• Patient not compliant in parent trial (INBUILD®), with trial medication or trial visits, according to investigator's judgement.
• Previous enrolment in this trial. Further exclusion criteria apply.

Once the criteria in section 'time frame frame' are fulfilled , researchers can use the following link https:// www.mystudywindow.com/msw/datasharing to request access to the clinical study documents regarding this study, and upon a signed "Document Sharing Agreement". Furthermore, researchers can request access to the clinical study data, for this and other listed studies, after the submission of a research proposal and according to the terms outlined in the website.

After all regulatory activities are completed in the US and EU for the product and indication, and after the primary manuscript has been accepted for publication.

For study documents - upon signing of a 'Document Sharing Agreement'. For study data - 1. after the submission and approval of the research proposal (checks will be performed by both the independent review panel and the sponsor, including checking that the planned analysis does not compete with sponsor's publication plan); 2. and upon signing of a 'Data Sharing Agreement'.