E13 vs L99
E13 (Other specified diabetes mellitus) compared with L99 (Other disorders of skin and subcutaneous tissue in diseases classified elsewhere), 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. L99 carries an Excludes1 note covering E13: “skin disorders in diabetes (E08-E13 with .62-)”
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 | L99Other disorders of skin and subcutaneous tissue in diseases classified elsewhere | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) | L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99) |
| Definition | Other specified diabetes mellitus is a non-billable ICD-10-CM category code (E13). | Other disorders of skin and subcutaneous tissue in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (L99). |
| 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 | — | underlying disease, such as: amyloidosis (E85.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources