​ The code V91 is not included in the “Pregnancy” value set because it is considered a supplemental code for the multiple gestation codes 651.0-651.9. This means that in order to use V91 you first must code 651.0-651.9. Given this guidance, we felt that these patients would be captured better through codes 651.0-651.9 rather than a supplemental status code of V91. Below is a rationale for the codes that were included in the value set.   ICD-9: Category 630-633: included codes that resulted in an intrauterine pregnancy Category 634-639: did not include as they are classified as ‘Other Pregnancy with Abortive Outcome’ – did not result in a delivery Category 640-649: only allowed for the use of .x1, .x2, .x3 as the fifth digit, when indicated as an appropriate 5th digit Category 650-659: only allowed for the use of .x1, .x2, .x3 as the fifth digit, when indicated as an appropriate 5th digit Category 660-669: only allowed for the use of .x1, .x2, .x3 as the fifth digit, when indicated as an appropriate 5th digit Category 670-677: only allowed for the use of .x1, .x2, .x3 as the fifth digit, when indicated as an appropriate 5th digit Category 678-679: only allowed for the use of .x1, .x2, .x3 as the fifth digit, when indicated as an appropriate 5th digit V Codes: included codes that indicated a pregnant state (not supervision of [eg, V22.0, V22.1])   ICD-10: Using the ICD-9 codes included using above rationale, used the GEMs and other mapping resources to develop a synonymous list.   SNOMED-CT: included concepts with an ‘is a’ relationship to the following hierarchies; these are all findings (with the exception of one concept, planned for removal) - · unplanned pregnancy · finding of pattern of pregnancy · patient currently pregnant