Surgical removal of the uterus.
For the 100% rating in the first three months, medical records confirming the date of the uterine removal — such as operative reports or discharge summaries — are the core evidence, because the rating period runs directly from that date.
For the ongoing 30% rating, the same surgical records establish that the removal occurred. A pathology report or follow-up clinical notes that confirm the procedure was completed can also support this level.
Statements from you or people who know you describing how the condition affects your daily life and work may help VA understand the full picture, though the 30% rating itself turns on the fact of removal rather than specific ongoing symptoms. Because loss of a creative organ can trigger special monthly compensation, records that document the anatomical loss may be relevant to that separate determination as well.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.