The c.1217T>G (p.Met406Arg) variant is a missense variant located in exon 9 of the BMPR2 gene, predicted to cause substitution of methionine to arginine encoding the functionally relevant catalytic kinase domain but without functional evidence indicating a critical or non-critical amino acid residue (PM1_moderate). This variant is absent from gnomAD v2.1.1 and v4.1 (PM2_supporting). BMPR2 has a low rate of benign missense variation and missense variants are a common mechanism of pulmonary hypertension (PP2). The REVEL prediction algorithm score is 0.96 and AlphaMissense is 0.9818 indicating pathogenicity (PP3_supporting). The variant has been reported in four studies based on 2 unrelated probands (PMIDs: 29650961, 33066286, 32581362, and 27537724) (PS4_supporting). PS2 was not assessed due to lack of paternity data. Functional studies have not been conducted for this variant (PS3 not assessed). In summary, this variant meets the criteria to be classified as a likely pathogenic for pulmonary arterial hypertension based on the ACMG/AMP criteria applied, as specified by the ClinGen Pulmonary Hypertension VCEP: PM1_moderate, PM2_supporting, PP2, PP3_supporting, PS4_supporting (VCEP specification version 2.0, 1/30/2026).