E13 vs R40.2442
E13 (Other specified diabetes mellitus) compared with R40.2442 (Other coma, without documented Glasgow coma scale score, or with partial score reported, at arrival to emergency department), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. R40.2442 carries an Excludes1 note covering E13: “somnolence, stupor and coma in diabetes (E08-E13)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| E13Other specified diabetes mellitus | R40.2442Other coma, without documented Glasgow coma scale score, or with partial score reported, at arrival to emergency department | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) |
| Definition | Other specified diabetes mellitus is a non-billable ICD-10-CM category code (E13). | Other coma, without documented Glasgow coma scale score, or with partial score reported, at arrival to emergency department is a billable ICD-10-CM diagnosis code (R40.2442). |
| 7th character | — | The following appropriate 7th character is to be added to subcategory R40.24-: |
| Includes | 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 | — |
| Use additional code | code to identify control using: injectable non-insulin antidiabetic drugs (Z79.85) insulin (Z79.4) | — |
| Code first | — | any associated: fracture of skull (S02.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources