ConditionsImmune System DisordersUndifferentiated and Mixed Connective Tissue Disease
Blue Book Listing 14.06

Undifferentiated and Mixed Connective Tissue Disease

Overlapping features of multiple autoimmune diseases without meeting criteria for any single one.

What you have to prove

Meet listing via: (1) involvement of two or more organs with one at moderate severity AND two constitutional symptoms; OR (2) repeated manifestations with marked limitation in daily activities, social functioning, or completing tasks.

Medical evidence SSA expects

Rheumatologist records, ANA panel, anti-RNP (MCTD), and organ-specific testing.

Common misconceptions

This is a catch-all category. Cases strongest when documenting clear organ-system involvement that fits patterns from other 14.xx listings but doesn't fully meet any single one.

Didn't meet the listing? You can still qualify via a Medical-Vocational Allowance — SSA's determination that your residual functional capacity, combined with your age, education, and work history, leaves no jobs you can do. See our appeals guide for what to do after an initial denial.