M21-1
VA Terminology Definition
Plain English Definition
The VA's Adjudication Procedures Manual - the internal guide VA employees use to process claims.
Why This Matters
M21-1 contains detailed instructions for rating claims, evaluating evidence, and applying regulations. It's publicly available and can help you understand how VA employees should handle your claim.
Example
M21-1, Part III, Subpart iv, Chapter 4 explains how to evaluate PTSD stressors. If your claim was mishandled, citing the specific M21-1 section can strengthen your appeal.