L94 vs M36
L94 (Other localized connective tissue disorders) compared with M36 (Systemic disorders of connective 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. L94 carries an Excludes1 note covering M36: “systemic connective tissue disorders (M30-M36)”
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
| L94Other localized connective tissue disorders | M36Systemic disorders of connective tissue in diseases classified elsewhere | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Other localized connective tissue disorders is a non-billable ICD-10-CM category code (L94). | Systemic disorders of connective tissue in diseases classified elsewhere is a non-billable ICD-10-CM category code (M36). |
| Includes | — | autoimmune disease NOS collagen (vascular) disease NOS systemic autoimmune disease systemic collagen (vascular) disease |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources