D86 vs M35.9
D86 (Sarcoidosis) compared with M35.9 (Systemic involvement of connective tissue, unspecified), 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. D86 carries an Excludes1 note covering M35.9: “autoimmune disease (systemic) NOS (M35.9)”
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
| D86Sarcoidosis | M35.9Systemic involvement of connective tissue, unspecified | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | D50-D89 — Diseases of the Blood and Blood-forming Organs and Certain Disorders Involving the Immune Mechanism (D50-D89) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Sarcoidosis is a non-billable ICD-10-CM category code (D86). | Systemic involvement of connective tissue, unspecified is a billable ICD-10-CM diagnosis code (M35.9). |
| Includes | defects in the complement system immunodeficiency disorders, except human immunodeficiency virus [HIV] disease sarcoidosis | 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