The main aim of this study is to evaluate the rates of adverse events of special interest (AESIs) (thrombotic events, acute kidney injury [AKI], and hemolytic events) among participants with CIDP initiating GGL compared with rates among participants with CIDP initiating comparator intravenous immunoglobulin (IVIG) products.

No study medicines will be provided to participants in this study.

Inclusion Criteria:

• Have a minimum of 6 months of continuous enrollment in the study database with medical and pharmacy coverage before the index date. Gaps in continuous enrollment less than or equal to (<=) 31 days are permitted.
• Fulfill the Chronic Inflammatory Demyelinating Polyradiculoneuropathy (CIDP) diagnosis algorithm on or before the index date using all available baseline data for each participant.
• Additionally, to be eligible for the Ig-naive (new-to-class) cohort, participants will be required to meet the following inclusion criterion:
• Be free of any previous recorded use of any Ig product at any point before IVIG initiation.
• To be eligible for the Ig-experienced (new-to-drug) cohort, participants will be required to meet the following inclusion criterion:
• Have any previous recorded use of an Ig product at any point before the index date.

Exclusion Criteria:

• Having claims for greater than or equal to (>=) 2 different IVIG products on the index date.

• Recorded diagnosis of any of the following conditions where Ig products are used for treatment on or before the index date

  1. Primary immunodeficiency disease (PID).
  2. Evidence of secondary immunodeficiency (SID), including hematological malignancy (e.g., diagnosis of multiple myeloma or chronic lymphocytic leukemia) or treatment with rituximab.
  3. Idiopathic thrombocytopenic purpura (ITP).
  4. Dermatomyositis or polymyositis.
  5. Systemic sclerosis/scleroderma.
  6. Myasthenia gravis.

Participants with CIDP on treatment with GGL and other IVIG products will be observed in this retrospective study.

De-identified individual participant data from this particular study will not be shared as the data are subject to contractual (or consent) provisions that prohibit transfer to third parties.