Is E10.A1 a billable ICD-10-CM code?

Yes. E10.A1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does E10.A1 sit in the tabular list?

Endocrine, nutritional and metabolic diseases (E00-E89), in the block Diabetes mellitus (E08-E13).

What cannot be coded together with E10.A1?

E10.A1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above E10.A1 (E10) and apply to it just the same.

E10.A1

E10.A1 — Type 1 diabetes mellitus, presymptomatic, Stage 1

Billable / specific codeICD-10-CM

E10.A1 is a billable, specific ICD-10-CM code for type 1 diabetes mellitus, presymptomatic, stage 1. It is valid for submission on a claim.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Multiple confirmed islet autoantibodies with normoglycemia

Excludes1 inherited from the categories above E10.A1

These are not written on E10.A1, but they bind it: a note on a category applies to every code beneath it. Billing E10.A1 with anything listed here is a denial.

Written on E10 — Type 1 diabetes mellitus

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.-)

Other codes that can never be billed with E10.A1

These codes carry an Excludes1 note pointing at E10.A1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E10.A1 alone.

E11Type 2 diabetes mellitus
E13Other specified diabetes mellitus
Q45.3Other congenital malformations of pancreas and pancreatic duct
E09Drug or chemical induced diabetes mellitus
E08Diabetes mellitus due to underlying condition

Risk adjustment

E10.A1 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

E10.A1 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52464Glucose Monitor - Policy Article
A56232Billing and Coding: Foot Care
A56675Billing and Coding: Homocysteine Level, Serum
A56686Billing and Coding: HbA1c

How E10.A1 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to E10.A1.

Autoantibodies, multiple confirmed islet, with normoglycemia
Diabetes, diabetic›type 1›presymptomatic›Stage 1

Code history

What changed, and when. Derived by diffing consecutive CMS release files — which matters when you are defending a code assigned under an earlier edition.

addedFY2024-FY2026
Type 1 diabetes mellitus, presymptomatic, Stage 1

Related codes at this level

Codes that share E10.A. If E10.A1 is not quite right, the correct code is usually one of these.

Questions about E10.A1

Is E10.A1 a billable ICD-10-CM code?: Yes. E10.A1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does E10.A1 sit in the tabular list?: Endocrine, nutritional and metabolic diseases (E00-E89), in the block Diabetes mellitus (E08-E13).
What cannot be coded together with E10.A1?: E10.A1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above E10.A1 (E10) and apply to it just the same.