Version 26
Data Item #225: Sex Assigned at Birth

This new data item will replace existing data item Sex [220] for all cases regardless of diagnosis year. Existing data in Sex [220] will be converted and used to populate the new data item.

Coding Instructions

1. Assign the sex of the patient assigned at birth.
2. When the patient’s sex is documented as male or female, and there is no other information to indicate the patient was assigned a different sex at birth, assign code 1 or 2, respectively.
3. When sex is not known.
   a. Assign code 1 when the primary site is C600-C639.
   b. Assign code 2 when the primary site is C510-C589.
   c. Assign code 9 for primary sites not included above.
4. Assign code 9 when sex is unknown (excluding number 3a and 3b above) or sex is not yet determined.
   a. Do not assign code 9 when sex is documented as male or female and there is no other information about sex assigned at birth.
5. Assign code 9 if patient is born with Disorders of Sexual Development (DSD) and sex is not clearly defined.
6. Assign code 9 when patient’s sex is documented as other than male or female (e.g., non-binary, transsexual), and there is no additional information about sex assigned at birth.

digits

1, 2, 9