Other specified diffuse diseases of connective tissue

This code represents a group of systemic autoimmune disorders affecting connective tissues throughout the body that do not fit the criteria for more specific, well-defined conditions like lupus or scleroderma. These conditions involve widespread inflammation and damage to various organ systems, often presenting with a complex array of symptoms.

Use this code when documentation clearly indicates a diffuse connective tissue disease that is specified but does not have a more precise ICD-9-CM code. This often applies to conditions like mixed connective tissue disease (MCTD) or undifferentiated connective tissue disease (UCTD) when the physician explicitly states it. Supporting documentation should detail the specific type of "other" connective tissue disease diagnosed.

• Do not use this code for unspecified connective tissue diseases; a more specific code exists for those.
• Always review the physician's diagnostic statement for the most precise condition before defaulting to this code.
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter, followed by codes for associated manifestations.