- CodeDescription
- 4A00 Central Nervous
- 4A01 Peripheral Nervous
- 4A02 Cardiac
- 4A03 Arterial
- 4A04 Venous
- 4A05 Circulatory
- 4A06 Lymphatic
- 4A07 Visual
- 4A08 Olfactory
- 4A09 Respiratory
- 4A0B Gastrointestinal
- 4A0C Biliary
- 4A0D Urinary
- 4A0F Musculoskeletal
- 4A0H Products of Conception, Cardiac
- 4A0J Products of Conception, Nervous
- 4A0Z None