2026 ICD-10-CM Diagnosis Code E11.9Type 2 diabetes mellitus without complications

ICD-10-CM CodesE00–E89E08-E13E11

ICD-10-CM E11.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E11.9 is a billable ICD-10-CM diagnosis code for type 2 diabetes mellitus without complications. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 637 through 639. The code is flagged as a questionable admission, since it rarely justifies inpatient admission on its own. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diabetes mellitus without complication; and Diabetes mellitus, Type 2.

This medical diagnosis code is frequently used in Family Practice, Internal Medicine, Pediatrics, and Family Practice medical specialties to designate conditions such diabetes mellitus w/o complications type 2.

Code Identity

ICD-10-CM Code
E11.9
Billable Status
Yes — Valid for Submission
Code Describes
Type 2 diabetes mellitus without complications
Short Description
Type 2 diabetes mellitus without complications
Same as the full description in the CMS dataset.
Parent Code
Type 2 diabetes mellitus

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE08-E13Diabetes mellitus
CategoryE11Type 2 diabetes mellitus
This CodeE11.9Type 2 diabetes mellitus without complications

Code EditsBilling

Medicare Code Editor checks that affect claim validity for E11.9.

Some diagnoses are not usually sufficient justification for admission to an acute care hospital. For example, if a patient is given code R030 for elevated blood pressure reading, without diagnosis of hypertension, then the patient would have a questionable admission, since elevated blood pressure reading is not normally sufficient justification for admission to a hospital. The following list contains diagnosis codes identified as questionable admission when used.

Quality Payment Program MeasuresBilling

Medicare quality measures that can apply when E11.9 is part of the patient record.

Diabetes: Hemoglobin A1c (HbA1c) Poor Control (>9%)

High Priority: YES

Measure Type: Intermediateoutcome

Submission Methods: Claims, Electronic Health Record, Cms Web Interface, Registry

Description: Percentage of patients 18-75 years of age with diabetes who had hemoglobin A1c > 9.0% during the measurement period.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acanthosis nigricans
  • Acanthosis nigricans due to type 2 diabetes mellitus
  • Acquired acanthosis nigricans
  • Atherosclerosis, deafness, diabetes, epilepsy, nephropathy syndrome
  • Blood sugar charts
  • Brittle diabetes mellitus
  • Brittle type 2 diabetes mellitus
  • Dermopathy due to type 2 diabetes mellitus
  • Diabetes mellitus
  • Diabetes mellitus associated with genetic syndrome
  • Diabetes mellitus in remission
  • Diabetes mellitus type 2 without retinopathy
  • Diabetes monitoring check done
  • Diabetes monitoring default
  • Diabetes monitoring deleted
  • Diabetes: practice program
  • Diabetes: shared care program
  • Diabetic - follow-up default
  • Diabetic - good control
  • Diabetic dermopathy
  • Diabetic drug side effects
  • Diabetic monitoring - injection sites
  • Diabetic on diet only
  • Diabetic on insulin
  • Diabetic on insulin and oral treatment
  • Diabetic on non-insulin injectable medication
  • Diabetic on oral treatment
  • Diabetic treatment changed
  • Does rotate site of insulin injection
  • Has seen dietitian - diabetes
  • Hemoglobin A1C - diabetic control finding
  • Hemoglobin A1c between 7 percent to 10 percent indicating borderline diabetic control
  • Hemoglobin A1c between 7%-9% indicating borderline diabetic control
  • Hemoglobin A1c greater than 10 percent indicating poor diabetic control
  • Hemoglobin A1c less than 7 percent indicating good diabetic control
  • Hemoglobin A1c within reference range
  • High hemoglobin A1c level
  • Insulin resistance
  • Insulin treated type 2 diabetes mellitus
  • Intrauterine growth restriction, short stature, early adult-onset diabetes syndrome
  • Ketosis-resistant diabetes mellitus
  • Lactic acidosis due to diabetes mellitus
  • Malabsorption of glucose
  • Maturity onset diabetes of the young, type 2
  • Megaloblastic anemia due to inborn errors of metabolism
  • Megaloblastic anemia, thiamine-responsive, with diabetes mellitus and sensorineural deafness
  • Metabolic acidosis due to diabetes mellitus
  • Neural hearing loss
  • Newly diagnosed diabetes
  • Photomyoclonus, diabetes mellitus, deafness, nephropathy and cerebral dysfunction
  • Pre-existing type 2 diabetes mellitus
  • Thiamine-responsive megaloblastic anemia
  • Type 2 diabetes mellitus
  • Type 2 diabetes mellitus controlled by diet
  • Type 2 diabetes mellitus in nonobese
  • Type II diabetes mellitus in remission
  • Understands diet - diabetes
  • Urine sugar charts
  • Well controlled type 2 diabetes mellitus
  • Woodhouse Sakati syndrome

Coding GuidelinesGuidance

The diabetes mellitus codes are combination codes that include the type of diabetes mellitus, the body system affected, and the complications affecting that body system. As many codes within a particular category as are necessary to describe all of the complications of the disease may be used. They should be sequenced based on the reason for a particular encounter. Assign as many codes from categories E08 - E13 as needed to identify all of the associated conditions that the patient has.

If the type of diabetes mellitus is not documented in the medical record the default is E11.-, Type 2 diabetes mellitus.

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • type 2 diabetes mellitus, without complications in remission E11.A

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Diabetes, diabetic(mellitus) (sugar)
    • Diabetes, diabetic(mellitus) (sugar)
      • type 2

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR END002
Diabetes mellitus without complication
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR END005
Diabetes mellitus, Type 2
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Acanthosis Nigricans

    a circumscribed melanosis consisting of a brown-pigmented, velvety verrucosity or fine papillomatosis appearing in the axillae and other body folds. it occurs in association with endocrine disorders, underlying malignancy, administration of certain drugs, or as in inherited disorder.
  • Diabetes Complications

    conditions or pathological processes associated with the disease of diabetes mellitus. due to the impaired control of blood glucose level in diabetic patients, pathological processes develop in numerous tissues and organs including the eye, the kidney, the blood vessels, and the nerve tissue.
  • Diabetes Mellitus

    a heterogeneous group of disorders characterized by hyperglycemia and glucose intolerance.
  • Diabetes Mellitus, Experimental

    diabetes mellitus induced experimentally by administration of various diabetogenic agents or by pancreatectomy.
  • Diabetes Mellitus, Lipoatrophic

    a type of diabetes mellitus that is characterized by severe insulin resistance and lipodystrophy. the latter may be generalized, partial, acquired, or congenital (lipodystrophy, congenital generalized).
  • Diabetes Mellitus, Type 1

    a subtype of diabetes mellitus that is characterized by insulin deficiency. it is manifested by the sudden onset of severe hyperglycemia, rapid progression to diabetic ketoacidosis, and death unless treated with insulin. the disease may occur at any age, but is most common in childhood or adolescence.
  • Diabetes Mellitus, Type 2

    a subclass of diabetes mellitus that is not insulin-responsive or dependent (niddm). it is characterized initially by insulin resistance and hyperinsulinemia; and eventually by glucose intolerance; hyperglycemia; and overt diabetes. type ii diabetes mellitus is no longer considered a disease exclusively found in adults. patients seldom develop ketosis but often exhibit obesity.
  • Diabetes, Gestational

    diabetes mellitus induced by pregnancy but resolved at the end of pregnancy. it does not include previously diagnosed diabetics who become pregnant (pregnancy in diabetics). gestational diabetes usually develops in late pregnancy when insulin antagonistic hormones peaks leading to insulin resistance; glucose intolerance; and hyperglycemia.
  • Latent Autoimmune Diabetes in Adults

    autoimmune diabetes in adults with slowly progressive pancreatic beta cell failure and the presence of circulating autoantibodies to pancreatic islets cell antigens.
  • Polyendocrinopathies, Autoimmune

    autoimmune diseases affecting multiple endocrine organs. type i is characterized by childhood onset and chronic mucocutaneous candidiasis (candidiasis, chronic mucocutaneous), while type ii exhibits any combination of adrenal insufficiency (addison's disease), lymphocytic thyroiditis (thyroiditis, autoimmune;), hypoparathyroidism; and gonadal failure. in both types organ-specific antibodies against a variety of endocrine glands have been detected. the type ii syndrome differs from type i in that it is associated with hla-a1 and b8 haplotypes, onset is usually in adulthood, and candidiasis is not present.
  • Insulin Resistance

    diminished effectiveness of insulin in lowering blood sugar levels: requiring the use of 200 units or more of insulin per day to prevent hyperglycemia or ketosis.
  • Metabolic Syndrome

    a cluster of symptoms that are risk factors for cardiovascular diseases and type 2 diabetes mellitus. the major components of metabolic syndrome include abdominal obesity; atherogenic dyslipidemia; hypertension; hyperglycemia; insulin resistance; a proinflammatory state; and a prothrombotic (thrombosis) state.
  • Pancreatectomy

    surgical removal of the pancreas. (dorland, 28th ed)
  • Acanthosis Nigricans

    a melanotic cutaneous lesion that develops in the axilla and other body folds. it may be idiopathic, drug-induced, or it may be associated with the presence of an endocrine disorder or malignancy.
  • Hyperandrogenism, Insulin Resistance, Acanthosis Nigricans Syndrome|HAIR-AN Syndrome

    a condition characterized by hyperandrogenism, insulin resistance, and acanthosis nigricans, typically associated with obesity in teenage girls. it is considered to be a subtype of polycystic ovarian syndrome, but may occur in male individuals. etiology is unclear, but some cases may be associated with mutations affecting the tyrosine kinase domain of the insulin receptor.
  • Insulin Resistant Diabetes Mellitus with Acanthosis Nigricans and Hyperandrogenism|Type A Insulin Resistance Syndrome

    a syndrome of insulin resistance caused by mutation(s) in the insr gene, encoding the insulin receptor. this condition is characterized by a clinical triad of hyperinsulinemia, acanthosis nigricans, and hyperandrogenism without lipodystrophy. this is the least severe of a spectrum of disorders; the other two conditions are rabson-mendenhall syndrome and donohoe syndrome.
  • Homeostatic Model Assessment of Insulin Resistance

    an assessment of beta-cell function and insulin resistance based on fasting blood glucose and insulin concentrations.
  • Insulin Receptor Mutation - Associated Insulin Resistance Syndromes

    insulin resistance caused by inactivating mutation(s) in the insr gene encoding the insulin receptor.
  • Insulin Resistance

    decreased sensitivity to circulating insulin which may result in acanthosis nigicrans, elevated insulin level or hyperglycemia.
  • Insulin Resistance Measurement|INSULINR|Insulin Resistance|Insulin Resistance

    the determination of the insulin resistance (cells inability to respond to insulin) in a biological specimen.
  • Insulin Resistance Syndrome

    a cluster of closely related metabolic abnormalities associated with insulin resistance that confer an increased risk of the development of type 2 diabetes and cardiovascular disease. these abnormalities may include obesity, high blood pressure, abnormal cholesterol levels, proteinuria, and/or polycystic ovary syndrome.
  • Obesity-Associated Insulin Resistance

    insulin resistance associated with obesity, which may be attributed in part to impaired insulin signaling in target tissues, or impaired insulin-stimulated glucose transport due to reduced expression of the glucose transporter protein 4.

Patient EducationClinical

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 full article covers:

  • What is type 2 diabetes?
  • What causes type 2 diabetes?
  • Who is at risk for type 2 diabetes?
  • What are the symptoms of type 2 diabetes?
  • How is type 2 diabetes diagnosed?
  • What are the treatments for type 2 diabetes?
  • Can type 2 diabetes be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert E11.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
250.00 DMII wo cmp nt st uncntr
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replaced This code was replaced in the FY 2026 code set by:

  • E11.A - Type 2 diabetes mellitus without complications in remission
  • E11.A - Type 2 diabetes mellitus without complications in remission
  • E11.A - Type 2 diabetes mellitus without complications in remission
  • E11.A - Type 2 diabetes mellitus without complications in remission
  • E11.A - Type 2 diabetes mellitus without complications in remission
  • E11.A - Type 2 diabetes mellitus without complications in remission
FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About E11.9Overview

Is E11.9 (Type 2 diabetes mellitus) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report type 2 diabetes mellitus without complications on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does E11.9 group to?

When type 2 diabetes mellitus without complications is the principal diagnosis on an inpatient stay, it groups to MS-DRG 637, 638, 639, with relative weights from 0.6212 to 1.4367 depending on complications. Higher weights mean higher Medicare reimbursement.

Does E11.9 justify an inpatient admission?

Not on its own. The Medicare Code Editor lists this code as a questionable admission because type 2 diabetes mellitus without complications is not usually sufficient justification for admission to an acute care hospital.

What is the ICD-9 equivalent of E11.9?

Under the General Equivalence Mappings, type 2 diabetes mellitus without complications converts to ICD-9-CM 250.00 (DMII wo cmp nt st uncntr). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.