2026 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 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 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
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 2026, published by CMS and the National Center for Health Statistics.
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Confirmed islet autoimmunity with dysglycemia
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Diabetes, diabetic (mellitus) (sugar) - E11.9
- presymptomatic - E10.A0
- Stage 2 - E10.A2
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Autoimmunity, confirmed islet, with dysglycemia
- Diabetes, diabetic(mellitus) (sugar)
- type 1
- presymptomatic
- Stage 2
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Code History & ChangesHistory
Replacement E10.A2 replaces the following previously assigned code(s):
- R73.03 - Prediabetes
Questions About E10.A2Overview
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, 2025 through September 30, 2026.
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 637, 638, 639, with relative weights from 0.6212 to 1.4367 depending on complications. Higher weights mean higher Medicare reimbursement.
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.
