- Type 1 diabetes (absolute insulin deficiency, including latent autoimmune diabetes in adults)
- 2. Type 2 diabetes (progressive loss of β-cell insulin secretion, often with insulin resistance)
- 3. Specific types of diabetes due to other causes (e.g., monogenic diabetes, pancreatic diseases, drug- or chemical-induced diabetes, infections, uncommon genetic syndromes)
Rationale: The classification is based on the pathogenic process leading to hyperglycemia, as outlined in the ADA 2026 Standards of Care. All forms of diabetes confer risk for chronic complications, though progression may vary.