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ISD Scotland Home

SMR Datasets

Patient Identification Section

NHS National Services Scotland ISD Scotland & NHS National Services Scotland

Community Health Index (CHI) Number

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Name: CHI/CI Number

Number of characters: 10

Priority: Optional

Number Description Error / Option code
1 CHI/CI Number should be present
Query Message: CHI/CI is missing
Flag: CHI/CI Number
Q0310
2 If present, CHI/CI Number must be numeric
Error Message: CHI/CI Number Invalid Format
Flag: CHI/CI Number  
E0814 
3 The final digit is a Modulus 11 check digit
Error Message: CHI/CI Number Invalid Format
Flag:  CHI/CI Number 
E0814
4 The first 6 digits should correspond to the patient's date of birth in DDMMYY format
Query Message: CHI/CI Number: First 6 digits do not correspond to Date of Birth (DDMMYY format) 
Flag:  CHI/CI Number, Date of Birth
Q0306 
5 The 9th character should be numeric and:
a) an odd number if Sex = 1
b) an even number if Sex = 2
Query Message:  CHI/CI Number: 9th digit unlikely for male/female
Flag:  CHI/CI Number, Sex
Q0308

Cross Checks: none.

Public Health Scotland
Gyle Square
1 South Gyle Crescent
Edinburgh
EH12 9EB