All ICD10 Codes
E10Not billable, use a more specific code below

Type 1 diabetes mellitus

In Diabetes mellitus (E08-E13), chapter 4: Endocrine, Nutritional and Metabolic Diseases

87 billable codes under E10: 3 are an MCC, 1 is a CC; 84 map to HCC 37 (Diabetes with Chronic Complications), HCC 298 (Severe Diabetic Eye Disease, Retinal Vein Occlusion, and Vitreous Hemorrhage), HCC 38 (Diabetes with Glycemic, Unspecified, or No Complications) and 3 more HCCs.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

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Instructional notes

Includes: conditions that are coded here

  • brittle diabetes (mellitus)
  • diabetes (mellitus) due to autoimmune process
  • diabetes (mellitus) due to immune mediated pancreatic islet beta-cell destruction
  • idiopathic diabetes (mellitus)
  • juvenile onset diabetes (mellitus)
  • ketosis-prone diabetes (mellitus)

Excludes1: not coded here, use a different code

  • diabetes mellitus due to underlying condition (E08.-)
  • drug or chemical induced diabetes mellitus (E09.-)
  • gestational diabetes (O24.4-)
  • hyperglycemia NOS (R73.9)
  • neonatal diabetes mellitus (P70.2)
  • postpancreatectomy diabetes mellitus (E13.-)
  • postprocedural diabetes mellitus (E13.-)
  • secondary diabetes mellitus NEC (E13.-)
  • type 2 diabetes mellitus (E11.-)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

  • Section I.C.4.a Diabetes mellitus (page 39), covers E10

    Assign as many codes from E08 to E13 as needed for all complications; default to E11.- when type is undocumented. Add Z79 codes for long-term insulin, oral, or injectable drugs, but not Z79.4 for temporary insulin.

Other Chapter 4 topics:

Read Section I.C.4 (page 39)

All codes under E10

E10 can't be used on a claim. Pick a billable code below; grey headings group them.

E10 MS-DRGs

As the principal diagnosis, the billable codes under E10 group to these 16 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to E10

Notes on these codes point to E10.

  • E08 Excludes1: type 1 diabetes mellitus (E10.-)
  • E09 Excludes1: type 1 diabetes mellitus (E10.-)
  • E11 Excludes1: type 1 diabetes mellitus (E10.-)
  • E13 Excludes1: diabetes (mellitus) due to autoimmune process (E10.-)
  • E13 Excludes1: diabetes (mellitus) due to immune mediated pancreatic islet beta-cell destruction (E10.-)
  • E13 Excludes1: type 1 diabetes mellitus (E10.-)
  • E87.2 Excludes1: diabetic acidosis - see categories E08-E10, E11, E13 with ketoacidosis
  • O24.0 Use Additional Code: code from category E10 to further identify any manifestations
  • Q45.3 Excludes1: congenital diabetes mellitus (E10.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Diabetes Type 1

Diabetes means your blood glucose, also called blood sugar, is too high. With type 1 diabetes, your body makes little or no insulin. Insulin is a hormone from your pancreas that helps glucose move from your body into your cells, where it is used for energy. Your body can make glucose, but it also comes from the food you eat. Without insulin, too much glucose stays in your blood.

Read more about diabetes type 1 on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.