Updating and Validating the Rheumatic Disease Comorbidity Index to Incorporate ICD‐10‐CM Diagnostic Codes
Authors' conclusion
The newly proposed ICD-10-CM codes for the RDCI-generated comparable RDCI scores to those derived from ICD-9-CM codes and are highly predictive of functional status and death.
Study context
- Population
- Multicentre, prospective RA registry spanning the ICD-9-CM to ICD-10-CM transition862 in both cohorts
- Participants
- 1,425 vs 1,068
- Comparison
- ICD-10-CM-derived vs ICD-9-CM-derived Rheumatic Disease Comorbidity Index (RDCI) scores
- ICD-10-CMn = 1,425
- ICD-9-CMn = 1,068reference
- Outcome
- Agreement of ICD-9- and ICD-10-derived RDCI scores (ICC)
Methodological detailsprospective registry cohort, multicentre, linked administrative data
- Prospective registry cohort
- Multicentre
- Linked administrative data
Performance
As reported in the abstract
RDCI score
ICD-9-CM
2.93
mean · SD 1.72
ICD-10-CM
2.92
mean · SD 1.74
- Agreement of RDCI scores in individuals in both cohorts (intraclass correlation coefficients (ICC))
- 0.71 (95% CI 0.68-0.74)
Further findings
Prevalence of comorbidities
- Similar between cohorts, absolute differences
- <6%
Predictive ability for death and functional status · during follow-up
- Higher RDCI scores associated with greater risk of death and poorer functional status in both cohorts
- Models including RDCI had lowest QIC (functional status) and AIC (death) values in both cohorts
Original publication
Updating and Validating the Rheumatic Disease Comorbidity Index to Incorporate ICD‐10‐CM Diagnostic Codes. Arthritis Care Res (Hoboken). Published 17 April 2023. doi:10.
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