ArticleMedical care2020
Development and Testing of Compatible Diagnosis Code Lists for the Functional Comorbidity Index: International Classification of Diseases, Ninth Revision, Clinical Modification and International Classification of Diseases, 10th Revision, Clinical Modification.
Article in Medical care, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.
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Who cites it
14 citing papers in PubMed.
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- Bio-Inspired Artificial Intelligence Multimorbidity Score for Human-Machine Clinical Risk Stratification.Cyborg and bionic systems (Washington, D.C.) · 2026Article
- Trajectories of post-discharge cognitive function and associated risk factors in ICU survivors: a secondary analysis.Scientific reports · 2025Article
- The Impact of Chiropractic Care on Opioid Prescriptions in Veterans Health Administration Patients Receiving Low Back Pain Care.Journal of general internal medicine · 2025Article
- Efficacy and Safety of a Digital Tapering Intervention for Patients Prescribed Opioids After Surgery: Protocol for a Prospective Exploratory Cohort Study.JMIR research protocols · 2025Article
- Comparing major comorbidity indices as predictors of all-cause mortality in the Veterans Affairs health care system.Journal of clinical epidemiology · 2025Article
- The Problem of Pain in Lupus: Epidemiological Profiles of Patients Attending Multidisciplinary Pain Clinics.Pain management nursing : official journal of the American Society of Pain Management Nurses · 2024Article
- Using the Functional Comorbidity Index with administrative workers' compensation data: Utility, validity, and caveats.American journal of industrial medicine · 2024Article
- Updating and Validating the Rheumatic Disease Comorbidity Index to Incorporate ICD-10-CM Diagnostic Codes.Arthritis care & research · 2023Article
- Associations Between Management Pathway and Opioid Prescriptions for Patients Entering the Emergency Department With Neck and Back Pain.Mayo Clinic proceedings. Innovations, quality & outcomes · 2023Article
- Differential underestimation of work-related reinjury risk for older workers: Challenges to producing accurate rate estimates.American journal of industrial medicine · 2022Article
- Initial return to work and long-term employment patterns: Associations with work-related permanent impairment and with participation in workers' compensation-based return-to-work programs.American journal of industrial medicine · 2021Article
- Estimating time to reinjury among Washington State injured workers by degree of permanent impairment: Using state wage data to adjust for time at risk.American journal of industrial medicine · 2021Article
Corrections and comments
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Authors and funding
2 authors.
Funding
Abstract
backgroundThe Functional Comorbidity Index (FCI) was developed for community-based adult populations, with function as the outcome. The original FCI was a survey tool, but several International Classification of Diseases (ICD) code lists-for calculating the FCI using administrative data-have been published. However, compatible International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) and ICD-10-CM versions have not been available.
objectiveWe developed ICD-9-CM and ICD-10-CM diagnosis code lists to optimize FCI concordance across ICD lexicons. RESEARCH
designWe assessed concordance and frequency distributions across ICD lexicons for the FCI and individual comorbidities. We used length of stay and discharge disposition to assess continuity of FCI criterion validity across lexicons. SUBJECTS: State Inpatient Databases from Arizona, Colorado, Michigan, New Jersey, New York, Utah, and Washington State (calendar year 2015) were obtained from the Healthcare Cost and Utilization Project. State Inpatient Databases contained ICD-9-CM diagnoses for the first 3 calendar quarters of 2015 and ICD-10-CM diagnoses for the fourth quarter of 2015. Inpatients under 18 years old were excluded. MEASURES: Length of stay and discharge disposition outcomes were assessed in separate regression models. Covariates included age, sex, state, ICD lexicon, and FCI/lexicon interaction.
resultsThe FCI demonstrated stability across lexicons, despite small discrepancies in prevalence for individual comorbidities. Under ICD-9-CM, each additional comorbidity was associated with an 8.9% increase in mean length of stay and an 18.5% decrease in the odds of a routine discharge, compared with an 8.4% increase and 17.4% decrease, respectively, under ICD-10-CM.
conclusionThis study provides compatible ICD-9-CM and ICD-10-CM diagnosis code lists for the FCI.
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