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ICD-10-CM 2027 diagnosis code

E10.AType 1 diabetes mellitus, presymptomatic

Not billable — use a more specific code

E10.A is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Code last changed in FY2025 (effective October 1, 2024). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About E10.A

E10.A is the ICD-10-CM diagnosis code for type 1 diabetes mellitus, presymptomatic. It belongs to category E10 (type 1 diabetes mellitus), block E08-E13 (diabetes mellitus) and chapter 4 (endocrine, nutritional and metabolic diseases). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within E10 (type 1 diabetes mellitus), E10.A is specifically for type 1 diabetes mellitus, presymptomatic. Related codes cover with ketoacidosis (E10.1), with kidney complications (E10.2), with ophthalmic complications (E10.3), with neurological complications (E10.4), with circulatory complications (E10.5), with other specified complications (E10.6), with unspecified complications (E10.8) and without complications (E10.9).

To report this condition, pick the subcode that matches the documentation: E10.A0 (unspecified), E10.A1 (stage 1) and E10.A2 (stage 2).

It was added in FY2025, effective October 1, 2024.

Specific codes under E10.A

Coding notes

Applicable toConditions and synonyms classified to this code
  • Early-stage type 1 diabetes mellitus

Notes that apply from higher levels

Instructions written at a parent level also apply to E10.A.

› From E10 Type 1 diabetes mellitus
Includes
  • 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)
Excludes1
  • 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.-)

Broader instructions also apply from Chapter 4: Endocrine, nutritional and metabolic diseases.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to E10.A.

Codes whose notes reference E10.A

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2025 (effective 10/1/2024): Added
  • No changes since FY2025.

Common questions about E10.A

Is E10.A billable?

No. E10.A is a header code. Report one of its more specific subcodes instead.