Table 4.

Scoring system 2: LN-No Code

Patient characteristic All patients are required to have at least one diagnosis code (ICD9 or ICD10) for SLE	Points (add unless stated)	Total score	Predicted probability
Highest urine protein–creatinine (UPCr) ratio test greater than or equal to 1 but less than 3 g/g Or Highest UPCr ratio test greater than or equal to 3 g/g	25	<35	<50%
	30	35–55	50–60%
One diagnosis code for acute or chronic kidney disease or proteinuria Or Two or more diagnosis codes for acute or chronic kidney disease or proteinuria	50	55–70	60–70%
	80	70–90	70–80%
One or more urinalysis tests positive for protein	35	90–125	80–90%
Age (in years) at first SLE diagnosis code	Subtract age	>125	>90%

Diagnosis codes for LN included ICD10 codes: M32.14 or M32.15, or ICD9 code: 710.0 in combination with ICD9 codes: 583.81, 581.81 or 583.89. Diagnosis codes for acute or chronic kidney disease or proteinuria included ICD10 codes: N00–N08, N17–N19 and R80, or ICD9 codes: 580–586 and 791.0.

ICD, International Classification of Diseases; LN, lupus nephritis.