E03.9 vs L98.5
E03.9 (Hypothyroidism, unspecified) compared with L98.5 (Mucinosis of the skin), 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. L98.5 carries an Excludes1 note covering E03.9: “myxedema (E03.9)”
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
| E03.9Hypothyroidism, unspecified | L98.5Mucinosis of the skin | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) | L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99) |
| Definition | Hypothyroidism, unspecified is a billable ICD-10-CM diagnosis code (E03.9). | Mucinosis of the skin is a billable ICD-10-CM diagnosis code (L98.5). |
| Includes | Myxedema NOS | Focal mucinosis Lichen myxedematosus Reticular erythematous mucinosis |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources