2027 ICD-10-CM Diagnosis Code E10.A2Type 1 diabetes mellitus, presymptomatic, Stage 2
ICD-10-CM Codes›E00–E89›E08-E13›E10
- Billable — Valid for Submission
- Chronic Condition
E10.A2 is a billable ICD-10-CM diagnosis code for type 1 diabetes mellitus, presymptomatic, Stage 2. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 8, 10, 19, 637 through 639. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diabetes mellitus without complication; and Diabetes mellitus, Type 1.
Code Identity
Code Classification
Quality Payment Program MeasuresBilling
Medicare quality measures that can apply when E10.A2 is part of the patient record.
Diabetes: Glycemic Status Assessment Greater Than 9%
High Priority: YES
Measure Type: Intermediateoutcome
Submission Methods: Claims, Electronic Health Record, Registry
Description: Percentage of patients 18-75 years of age with diabetes who had a glycemic status assessment (hemoglobin A1c [HbA1c] or glucose management indicator [GMI]) > 9.0% during the measurement period.
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.
The age of a patient is not the sole determining factor, though most type 1 diabetics develop the condition before reaching puberty. For this reason type 1 diabetes mellitus is also referred to as juvenile diabetes.
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027, published by CMS and the National Center for Health Statistics.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to E10.A2: its own notes plus those printed at E10 and Chapter 4. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives 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)
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Confirmed islet autoimmunity with dysglycemia
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- 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.-)
Notes
General instructions on how these codes are used.
- 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.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name E10.A2, its category, or a range that includes it.
Excludes1 8
These codes carry an Excludes1 note naming E10.A2: they are not reported together with it, unless the two conditions are unrelated.
- E08 Diabetes mellitus due to underlying conditiontype 1 diabetes mellitus (E10.-) names E10.-, which includes this code
- E09 Drug or chemical induced diabetes mellitustype 1 diabetes mellitus (E10.-) names E10.-, which includes this code
- E11 Type 2 diabetes mellitustype 1 diabetes mellitus (E10.-) names E10.-, which includes this code
- E13 Other specified diabetes mellitusdiabetes (mellitus) due to autoimmune process (E10.-) names E10.-, which includes this code
- E13 Other specified diabetes mellitusdiabetes (mellitus) due to immune mediated pancreatic islet beta-cell destruction (E10.-) names E10.-, which includes this code
- E13 Other specified diabetes mellitustype 1 diabetes mellitus (E10.-) names E10.-, which includes this code
- Q45.3 Other congenital malformations of pancreas and pancreatic ductcongenital diabetes mellitus (E10.-) names E10.-, which includes this code
- R73.0 Abnormal glucosetype 1 diabetes mellitus, presymptomatic (E10.A-) names E10.A-, which includes this code
Use Additional Code 1
These codes say to use an additional code from the note, and E10.A2 is one of the codes named.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
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.
Patient EducationClinical
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.
The full article covers:
- What is type 1 diabetes?
- What causes type 1 diabetes?
- Who is more likely to develop type 1 diabetes?
- What are the symptoms of type 1 diabetes?
- How is type 1 diabetes diagnosed?
- What are the treatments for type 1 diabetes?
- Can type 1 diabetes be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code History & ChangesHistory
Replacement E10.A2 replaces the following previously assigned code(s):
- R73.03 - Prediabetes
Questions About E10.A2Overview
What is the ICD-10 code for type 1 diabetes mellitus, presymptomatic, Stage 2?
The ICD-10-CM code for type 1 diabetes mellitus, presymptomatic, Stage 2 is E10.A2 (sometimes written as E10A2). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is E10.A2 (Type 1 diabetes mellitus, presymptomatic) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report type 1 diabetes mellitus, presymptomatic, Stage 2 on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does E10.A2 group to?
When type 1 diabetes mellitus, presymptomatic, Stage 2 is the principal diagnosis on an inpatient stay, it groups to MS-DRG 638, 639, 8, 10, 637, 19, with relative weights from 0.6375 to 7.5461 depending on complications. Higher weights mean higher Medicare reimbursement.
Can E10.A2 be reported with a code from E08?
Not as a rule. The Excludes1 note at E10, which applies to E10.A2, lists "diabetes mellitus due to underlying condition (E08.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
