Phase 0

Sibling codes

• XS21 – Phase 4
• XS3K – Phase 1
• XS41 – Phase 6
• XS47 – Phase 10
• XS4M – Phase 2
• XS73 – Phase 7
• XS83 – Phase 9
• XS8V – Phase 3
• XS8Z – Phase 5
• XS9Z – Phase 8

Foundation entity

Phase 0 – http://id.who.int/icd/entity/1636216146