Non-active primary progressive multiple sclerosis

This code signifies a patient diagnosed with primary progressive multiple sclerosis (PPMS) where the disease is currently stable and not exhibiting signs of active inflammation or progression. PPMS is characterized by a steady accumulation of disability from the onset, without distinct relapses or remissions. "Non-active" indicates the absence of new lesions on MRI, worsening symptoms, or clinical relapses.

Apply this code when documentation explicitly states "non-active primary progressive multiple sclerosis" or indicates stable PPMS without evidence of disease activity. Supporting documentation would include neurological evaluations, MRI reports confirming no new or enhancing lesions, and clinical notes reflecting a stable disease course.

• Differentiate from "active" PPMS (G35.B1), which indicates ongoing disease activity.
• Ensure documentation specifies "primary progressive" and not another MS subtype.
• Always review MRI findings and clinical notes for evidence of disease activity (e.g., new lesions, gadolinium enhancement, worsening symptoms) before assigning "non-active."