E13 vs L92.1
E13 (Other specified diabetes mellitus) compared with L92.1 (Necrobiosis lipoidica, not elsewhere classified), 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. L92.1 carries an Excludes1 note covering E13: “necrobiosis lipoidica associated with diabetes mellitus (E08-E13 with .620)”
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 | L92.1Necrobiosis lipoidica, not elsewhere classified | |
|---|---|---|
| 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). | Necrobiosis lipoidica, not elsewhere classified is a billable ICD-10-CM diagnosis code (L92.1). |
| 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) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources