All ICD10 Codes
E11Not billable, use a more specific code below

Type 2 diabetes mellitus

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

87 billable codes under E11: 5 are an MCC, 1 is a CC; 86 map to HCC 37 (Diabetes with Chronic Complications), HCC 298 (Severe Diabetic Eye Disease, Retinal Vein Occlusion, and Vitreous Hemorrhage), HCC 36 (Diabetes with Severe Acute 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.

Advertisements

Instructional notes

Includes: conditions that are coded here

  • diabetes (mellitus) due to insulin secretory defect
  • diabetes NOS
  • insulin resistant 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-)
  • neonatal diabetes mellitus (P70.2)
  • postpancreatectomy diabetes mellitus (E13.-)
  • postprocedural diabetes mellitus (E13.-)
  • secondary diabetes mellitus NEC (E13.-)
  • type 1 diabetes mellitus (E10.-)

Use additional code: add a second code for this, listed after this one

  • code to identify control using:
  • injectable non-insulin antidiabetic drugs (Z79.85)
  • insulin (Z79.4)
  • oral antidiabetic drugs (Z79.84)
  • oral hypoglycemic drugs (Z79.84)

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 E11

    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 E11

E11 can't be used on a claim. Pick a billable code below; grey headings group them.

E11 MS-DRGs

As the principal diagnosis, the billable codes under E11 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 E11

Notes on these codes point to E11.

  • E08 Excludes1: type 2 diabetes mellitus (E11.-)
  • E09 Excludes1: type 2 diabetes mellitus (E11.-)
  • E10 Excludes1: type 2 diabetes mellitus (E11.-)
  • E87.0 Excludes2: diabetes with hyperosmolarity (E08, E09, E11, E13 with final characters .00 or .01)
  • E87.2 Excludes1: diabetic acidosis - see categories E08-E10, E11, E13 with ketoacidosis
  • O24.1 Use Additional Code: from category E11 to further identify any manifestations
  • O24.3 Use Additional Code: from category E11 to further identify any manifestation

About the condition

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

Diabetes Type 2

Type 2 diabetes is a disease in which your blood glucose, or blood sugar, levels are too high. Glucose is your main source of energy. It comes from the foods you eat. A hormone called insulin helps the glucose get into your cells to give them energy. If you have diabetes, your body doesn't make enough insulin or doesn't use insulin well. The glucose then stays in your blood and not enough goes into your cells.

Read more about diabetes type 2 on MedlinePlus

Code history

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