ICD-10-CM Tabular Index · Chapter 4 · FY 2026 E08–E13
Diabetes mellitus (E08-E13) ICD-10-CM
The E08–E13 section covers diabetes mellitus with 582 ICD-10-CM diagnosis codes, of which 432 are billable in fiscal year 2026. The section is organized into the 5 code ranges listed below.
✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the E08–E13 Code Range
ICD-10 codes E08 through E13 cover different forms of diabetes mellitus, including diabetes due to underlying conditions, drug-induced diabetes, and the primary types 1 and 2 diabetes mellitus. These codes specifically categorize diabetes by cause and describe a wide range of complications such as ketoacidosis, kidney disease, eye problems, neuropathies, circulatory issues, skin conditions, and hypoglycemia.
This coding range differentiates diabetes types by their origin: E08 codes detail diabetes due to other medical conditions, while E09 refer to drug or chemical-induced diabetes. The well-known E10 and E11 codes specify type 1 and type 2 diabetes mellitus, respectively, encompassing their many complications. For example, ketoacidosis—a serious diabetes complication also referred to as diabetic ketoacidosis—is coded under these ranges (e.g., E10.10 for type 1 without coma, E11.10 for type 2). Eye-related issues like diabetic retinopathy, including proliferative and nonproliferative forms with or without macular edema, are extensively coded with modifiers for laterality (right, left, bilateral) and severity. Additionally, kidney complications such as diabetic nephropathy and chronic kidney disease, neurological complications including diabetic neuropathy and amyotrophy, and circulatory problems like diabetic peripheral angiopathy are all captured within this chapter. The codes also address skin complications such as diabetic dermatitis and foot ulcers, as well as oral complications including periodontal disease. Other specified diabetes mellitus are covered under E13 codes, addressing less common or genetically linked diabetes types and their complications. This comprehensive range assists coders in precisely classifying diabetes diagnoses along with their associated health issues to support accurate clinical documentation and billing.
Questions About This Page
How many codes are in the E08-E13 range?
The E08-E13 range contains 582 ICD-10-CM diagnosis codes in FY 2026. 432 of them are billable, and the rest are category headers that organize the section.
What conditions does E08-E13 cover?
The range covers diabetes mellitus. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
pancreatitis and other diseases of the pancreas K85K86
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
poisoning due to drug or toxin, if applicable T36T65
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
code for adverse effect, if applicable, to identify drug T36T50
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
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)
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
diabetes (mellitus) due to insulin secretory defect
diabetes NOS
insulin resistant diabetes (mellitus)
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
diabetes mellitus due to genetic defects of beta-cell function
diabetes mellitus due to genetic defects in insulin action
postpancreatectomy diabetes mellitus
postprocedural diabetes mellitus
secondary diabetes mellitus NEC
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
