Type 2 diabetes mellitus with hyperosmolarity with coma

This code signifies type 2 diabetes complicated by a hyperosmolar state that has progressed to a comatose condition. It indicates severe hyperglycemia, dehydration, and increased serum osmolality leading to a profound alteration in consciousness. This is a life-threatening acute metabolic complication of uncontrolled diabetes.

Use this code when documentation clearly states a patient with type 2 diabetes is experiencing hyperosmolar hyperglycemic state (HHS) and is in a coma. Supporting documentation includes laboratory findings of extreme hyperglycemia, elevated serum osmolality, and a physician's diagnosis of HHS with coma.

• Always ensure the documentation explicitly states "coma" in addition to hyperosmolarity.
• Do not use this code for hyperosmolarity without coma, or for diabetic ketoacidosis (DKA).
• Sequence this code as the principal diagnosis if it is the primary reason for the encounter.