Is E13 a billable ICD-10-CM code?

No. E13 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does E13 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 E13?

E13 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter.

E13

E13 — Other specified diabetes mellitus

Non-billable headerICD-10-CM

E13 is a non-billable header ICD-10-CM code for other specified diabetes mellitus. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

diabetes (mellitus) due to autoimmune process (E10.-)
diabetes (mellitus) due to immune mediated pancreatic islet beta-cell destruction (E10.-)
diabetes mellitus due to underlying condition (E08.-)
drug or chemical induced diabetes mellitus (E09.-)
gestational diabetes (O24.4-)
neonatal diabetes mellitus (P70.2)
type 1 diabetes mellitus (E10.-)

Use additional code

Add a secondary code to capture the detail described below.

code to identify control using:
injectable non-insulin antidiabetic drugs (Z79.85)
insulin (Z79.4)
oral antidiabetic drugs (Z79.84)
oral hypoglycemic drugs (Z79.84)

Includes

Conditions this code covers.

diabetes mellitus due to genetic defects of beta-cell function
diabetes mellitus due to genetic defects in insulin action
postpancreatectomy diabetes mellitus
postprocedural diabetes mellitus
secondary diabetes mellitus NEC

Other codes that can never be billed with E13

These codes carry an Excludes1 note pointing at E13. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E13 alone.

E10Type 1 diabetes mellitus
E11Type 2 diabetes mellitus
E16.1Other hypoglycemia
E16.2Hypoglycemia, unspecified
E74Other disorders of carbohydrate metabolism
E87.2Acidosis
G54.5Neuralgic amyotrophy
G59Mononeuropathy in diseases classified elsewhere

Risk adjustment

E13 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.

Code history

E13 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead E13

9 child codes. Green means billable.

Questions about E13

Is E13 a billable ICD-10-CM code?: No. E13 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does E13 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 E13?: E13 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter.