E10.A2 ICD-10-CM Code: Type 1 diabetes mellitus, presymptomatic, Stage 2
E10.A2 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Diabetes mellitus (E08-E13)
E10.A2
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceType 1 diabetes mellitus, presymptomatic, Stage 2
Type 1 diabetes in an intermediate presymptomatic stage, classified as Stage 2 based on disease progression markers.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Confirmed islet autoimmunity with dysglycemia
- Early-stage type 1 diabetes mellitusInherited from E10.A
Excludes 2
OfficialNo Excludes 2 notes are included in this display for E10.A2. Check the code and parent instructions in the Code Book.
Related Codes
Includes
Official- brittle diabetes (mellitus)Inherited from E10
- diabetes (mellitus) due to autoimmune processInherited from E10
- diabetes (mellitus) due to immune mediated pancreatic islet beta-cell destructionInherited from E10
- idiopathic diabetes (mellitus)Inherited from E10
- juvenile onset diabetes (mellitus)Inherited from E10
- ketosis-prone diabetes (mellitus)Inherited from E10
Excludes 1
Official- transitory endocrine and metabolic disorders specific to newborn (P70-P74)Inherited from E00-E89, E10
- diabetes mellitus due to underlying condition (E08.-)Inherited from E00-E89, E10
- drug or chemical induced diabetes mellitus (E09.-)Inherited from E00-E89, E10
- gestational diabetes (O24.4-)Inherited from E00-E89, E10
- hyperglycemia NOS (R73.9)Inherited from E00-E89, E10
- neonatal diabetes mellitus (P70.2)Inherited from E00-E89, E10
- postpancreatectomy diabetes mellitus (E13.-)Inherited from E00-E89, E10
- postprocedural diabetes mellitus (E13.-)Inherited from E00-E89, E10
- secondary diabetes mellitus NEC (E13.-)Inherited from E00-E89, E10
- type 2 diabetes mellitus (E11.-)Inherited from E00-E89, E10
Code First
OfficialNo Code First sequencing instructions are included in this display for E10.A2. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for E10.A2. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for E10.A2. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is E10.A2 an HCC code?
No. E10.A2 is a billable ICD-10-CM code with no mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models.
- Code
- E10.A2
- Description
- Type 1 diabetes mellitus, presymptomatic, Stage 2
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
Get the V28 mapping + MEAT cheat sheet
One printable reference: check representative V28 mappings and the documentation reminders your note needs. Free, no card.
Free PDF. No card. Unsubscribe anytime.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
E10.A2 is the ICD-10-CM diagnosis code for type 1 diabetes mellitus, presymptomatic, stage 2. Type 1 diabetes in an intermediate presymptomatic stage, classified as Stage 2 based on disease progression markers. E10.A2 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering diabetes mellitus (e08-e13).
E10.A2 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.
Stage 2 indicates more advanced autoimmune changes but still without clinical symptoms.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for E10.A2 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Stage 2 indicates more advanced autoimmune changes but still without clinical symptoms
- •Ensure documentation includes relevant lab values or clinical findings supporting Stage 2 status