IDDM ICD-10-CM Codes

What ICD-10 codes are used for IDDM? 

Type 1 Diabetes Mellitus, also known as insulin-dependent diabetes mellitus (IDDM), is a chronic metabolic condition classified under ICD-10-CM code E10. It differs from Type 2 diabetes mellitus, which typically develops later in life and is not always insulin-dependent. Though less common, neonatal diabetes mellitus may also fall under similar metabolic diseases, but requires a different code set depending on age and onset.

Although older documentation may refer to broad codes like E10.0–E10.4, these are category codes only and not valid for billing. Instead, providers should use specific subcodes for proper documentation and reimbursement.

• E10.9 – Type 1 diabetes mellitus without complications: Used when a patient has IDDM but no associated complications.
• E10.10 – With ketoacidosis without coma: Applicable for diabetic ketoacidosis (DKA) without coma.
• E10.11 – With ketoacidosis with coma: Used when DKA is present along with coma — a medical emergency.
• E10.21 – With diabetic nephropathy: For cases involving kidney damage from long-standing diabetes.
• E10.22 – With diabetic chronic kidney disease: Used when the patient has chronic kidney disease due to IDDM.
• E10.29 – With other diabetic kidney complications: Captures other renal issues related to Type 1 diabetes.
• E10.31 – E10.39 – With ophthalmic complications: This commonly includes E10.31 – unspecified diabetic retinopathy, E10.36 – diabetic cataract, and E10.39 – other ophthalmic complications.
• E10.40 – E10.49 – With neurological complications: This range typically includes E10.40 – diabetic neuropathy, unspecified, E10.42 – diabetic polyneuropathy, E10.49 – other neurological complications.
• E10.65 – With hyperglycemia: Used when blood glucose levels are significantly elevated.
• E10.69 – With other specified complications: For complications not classified elsewhere (e.g., skin or oral complications).

Which IDDM ICD codes are billable? 

All of the specific E10 subcodes listed above are billable and valid for use under ICD-10-CM 2025.

Parent codes like E10.0–E10.4 are not billable on their own and should be avoided in claims. Use the detailed subcodes (e.g., E10.10, E10.21, E10.65) that match the documented complication.

Clinical information

• IDDM, or type 1 diabetes, is a chronic autoimmune condition that impairs the body's insulin production, causing elevated blood sugar levels.
• Genetic disorders and environmental factors, including immune system-related genes and exposure to viruses and chemicals, likely contribute to the development of IDDM.
• IDDM symptoms often appear suddenly, including increased thirst, frequent urination, hunger, unexplained weight loss, fatigue, blurred vision, and slow-healing sores.
• Early medical attention is crucial if these symptoms arise, as proper treatment allows individuals with IDDM to lead healthy lives.
• Diagnosis relies on blood tests, with a fasting blood sugar level of 200 mg/dL or higher indicating IDDM; additional tests are used to exclude other causes of high blood sugar.
• While IDDM has no cure, insulin therapy is the primary treatment, involving regular injections or continuous insulin pump use, blood sugar monitoring, and dose adjustments.
• A healthy lifestyle with a balanced diet (rich in fruits, vegetables, and whole grains) and regular exercise complements insulin therapy.
• Despite proper management, individuals with IDDM face increased risks of complications such as diabetic retinopathy, diabetic nephropathy, diabetic neuropathy, heart disease, stroke, and foot issues.
• Regular medical check-ups and preventive measures are vital for reducing the likelihood of these complications in people with IDDM.
• ICD-10-CM guidelines emphasize selecting the correct category of specified diabetes mellitus, as each subtype, whether it be chemical-induced diabetes mellitus, neonatal, or type 1, has different complications and treatment needs. For example, diabetes mellitus with diabetic nephropathy or neuropathy requires a specific subcode to ensure accuracy in diagnosis and billing.

Popular search terms for this ICD cluster:

• Insulin-dependent diabetes
• Type 1 diabetes mellitus
• Juvenile diabetes
• Autoimmune diabetes
• Diabetes mellitus with ketoacidosis
• Diabetic nephropathy
• Diabetic neuropathy
• Diabetes mellitus with hyperglycemia
• Diabetes mellitus with unspecified complications
• Diabetes mellitus with other specified complications
• Other specified diabetes mellitus