Methemoglobinemia, unspecified

This code represents a blood disorder characterized by the presence of an abnormally high concentration of methemoglobin in the red blood cells. Methemoglobin is a form of hemoglobin that cannot bind oxygen, leading to reduced oxygen delivery to tissues. This condition can be congenital or acquired due to exposure to certain drugs or toxins.

Use this code when documentation indicates a diagnosis of methemoglobinemia without further specification of its type or cause. This is appropriate when the provider has diagnosed the condition but has not yet determined if it is congenital, acquired, or the specific agent responsible. Supporting documentation would include laboratory findings confirming elevated methemoglobin levels.

• Only use this code when the type of methemoglobinemia is truly unspecified in the medical record.
• If the cause is known (e.g., drug-induced), use a more specific code from the D74 category, along with an external cause code if applicable.
• Always review the entire medical record for any clues that might lead to a more precise diagnosis.