E11

Type 2 diabetes mellitus

FY2027Chapter 4: Endocrine, nutritional and metabolic diseases/E08–E13 Diabetes mellitus

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

Use additional code
Excludes1

E11 is a non-billable ICD-10-CM code category for type 2 diabetes mellitus. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are E11.0 Type 2 diabetes mellitus with hyperosmolarity, E11.1 Type 2 diabetes mellitus with ketoacidosis, E11.2 Type 2 diabetes mellitus with kidney complications, E11.3 Type 2 diabetes mellitus with ophthalmic complications and 6 more. Its coding notes include a Use additional code instruction and 9 Excludes1 entries.

Guidelines tips

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

If the type of diabetes is not documented, the default is E11.-. Use of insulin, oral hypoglycemics or injectable non-insulin drugs adds a Z79 code, except when insulin is given temporarily.

Guidelines I.C.4.a.2; I.C.4.a.3Diabetes mellitus: type not documented and insulin useRead the official text

Diabetes codes combine the type, the body system and the complication, and as many codes as needed are assigned to describe all complications.

Guidelines I.C.4.aDiabetes: combination codesRead the official text

Use additional code

Add the listed code as a secondary code, if known.

This code

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)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This 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.-)

Also from chapter/block level (1 note)

Inherited from Chapter 4 Endocrine, nutritional and metabolic diseases

transitory endocrine and metabolic disorders specific to newborn (P70-P74)

Includes

Further defines or gives examples of the content of the category.

This code

diabetes (mellitus) due to insulin secretory defect
diabetes NOS
insulin resistant diabetes (mellitus)

Notes

Also from chapter/block level (1 note)

Inherited from Chapter 4 Endocrine, nutritional and metabolic diseases

All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.

More specific codes under E11 10