This is a Trial Designed to Evaluate the Combination of Nerandomilast With Mycophenolate Across a Wide Variety of Pulmonary Fibrosis Subtypes, With the Aim of Providing Clinicians With Assurance That This is an Appropriate Therapeutic Combination.

Inclusion Criteria: * Any underlying pulmonary fibrosis diagnosis (excluding IPF) with ≥ 10% fibrosis on chest HRCT (performed within 1 year of screening) by volume assessment as determined by the treating physician * Anticipated benefit from nerandomilast therapy as determined by the treating physician (note that previous observed progression as defined in previous PPF clinical trials is not required prior to enrolment) * Stable dose of mycophenolate for the preceding 3 months, with a minimum total daily dose of 1,500mg for mycophenolate mofetil or 1080mg for mycophenolate sodium * Clinically stable for the preceding 6 weeks (did not require addition of corticosteroids for AE-ILD, or any other reason for urgent hospitalization). Exclusion Criteria: * Diagnosis of IPF * Contraindication to treatment with nerandomilast as determined by the treating physician * FVC \< 45% or DLCO \< 25% based on last PFT (must be performed within 3 months of screening) * Use of systemic prednisone \> 10 mg/day for \> 2 weeks within 3 months of screening (initiation of prednisone during the study is permitted if considered clinically indicated in the opinion of the treating physician) * Use of azathioprine, cyclophosphamide, rituximab, and/or tocilizumab within 3 months of screening (initiation of azathioprine, cyclophosphamide, rituximab, and/or tocilizumab during the study is permitted if considered clinically indicated in the opinion of the treating physician) * Use of pirfenidone and/or n…