Glycogen storage disease due to phosphorylase kinase deficiency GSD type IX ICD10:E74.0 OMIM:261740 orphanet Glycogenosis type IX Gycogenosis due to PhK deficiency Glycogenosis type 9 GSD type 9 Glycogen storage disease (GSD) due to phosphorylase kinase deficiency is a group of inborn errors of glycogen metabolism that is clinically and genetically heterogeneous. This group comprises GSD due to liver phosphorylase kinase (PhK) deficiency, GSD due to muscle PhK deficiency and GSD due to liver and muscle PhK deficiency (see these terms). Glycogen storage disease due to PhK deficiency GSD due to phosphorylase kinase deficiency UMLS:C0268147 Glycogen storage disease type IX Glycogenosis due to phosphorylase kinase deficiency Glycogen storage disease type 9 Disorder of carbohydrate metabolism