Guidelines for coding sex and gender

Starting point only for now.

Should mention

• Past history, removal of organ NOS for hysterectomy if appropriate. We discussed whether removed testicles should be included in this; if so it needs to be added to that page as well
• Past history, removal of breast (mastectomy) if appropriate
• Sex field which needs to include a distinction to gender, and how we code if it changes over time
• Gender identity disorder and that we removed it and why

Gender should probably redirect here.