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The Charlson comorbidity index is adapted to predict costs of chronic disease in primary care patients
Abstract
Objective (1) To determine chronic illness costs for large cohort of primary care patients, (2) to develop prospective model predicting total costs over one year, using demographic and clinical information including widely used comorbidity index.Study design and setting Data including diagnostic, medication, and resource utilization were obtained for 5,861 patients from practice-based computer system over a 1-year period beginning December 1, 1993, for retrospective analysis. Hospital cost data were obtained from hospital cost accounting system.Results Average annual per patient cost was $2,655. Older patients and those with Medicare or Medicaid had higher costs. Hospital costs were $1,558, accounting for 58.7% of total costs. In the predictive model, individuals with higher comorbidity incurred exponentially higher annual costs, from $4,317 with comorbidity score of two, to $5,986 with score of three, to $13,326 with scores greater than seven. To use an adapted comorbidity index to predict total yearly costs, four conditions should be added to the index: hypertension, depression, and use of warfarin with a weight of one, skin ulcers/cellulitis, a weight of two.Conclusion The adapted comorbidity index can be used to predict resource utilization. Predictive models may help to identify targets for reducing high costs, by prospectively identifying those at high risk.
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“the associated risk of death, and has beenwidely validated.21 Furthermore, the Charlson index has been shown to be strongly predictive of hospital resource utilization, whichmakes it uniquely well suited for measuring latent health as it relates to cost of treatment (Charlson et al. 2008).”
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“Categories ACG categories (1-93), Resource Utilization Bands (RUBs), Expended Diagnosis Clusters (EDC) count Six categories based on chronic condition count Score based on aggregated conditions (70 categories)”
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Predictors of Complications After Spinal Stabilization of Thoracolumbar Spine Injuries
Dimar, J. R., Fisher, C. G., Vaccaro, A. R., Okonkwo, D. O., Dvorak, M. F., Fehlings, M. G., Rampersaud, R. Y., & Carreon, L. Y. (2010) · The Journal of Trauma: Injury, Infection, and Critical Care · doi:10.1097/ta.0b013e3181cc853b · Cited by 61
Mayaud, L., Lai, P. S., Clifford, G. D., Tarassenko, L., Celi, L. A., & Annane, D. (2013) · Critical Care Medicine · doi:10.1097/ccm.0b013e3182772adb · Cited by 62
“The Van Walraven score is a modification of the Elixhauser comorbidity score (20), equivalent to the Charlson score (39, 40), which provides a weighting for 30 comorbidities: it is a validated and easily obtainable proxy for comorbid conditions.”
MethodKuo, C., Wu, V., Huang, K., Wang, S.-M., Chang, C., Lu, C., Yang, W., Tsai, C.-W., Lai, C., Lee, T., et al. (2011) · Journal of the Renin-Angiotensin-Aldosterone System · doi:10.1177/1470320310391329 · Cited by 60
Kubo, T., Tobe, K., Okuyama, K., Kikuchi, M., Chen, Y., Schelfhout, J., Abe, M., & Tokita, S. (2021) · BMJ Open Respiratory Research · doi:10.1136/bmjresp-2020-000764 · Cited by 59
Living Alone with Mild-To-Moderate Dementia: Findings from the IDEAL Cohort
Clare, L., Martyr, A., Henderson, C., Gamble, L. D., Matthews, F. E., Quinn, C., Nelis, S. M., Rusted, J. M., Thom, J. M., Knapp, M. R. J., et al. (2020) · Journal of Alzheimer s Disease · doi:10.3233/jad-200638 · Cited by 58
Association of Lithium Treatment With the Risk of Osteoporosis in Patients With Bipolar Disorder
Köhler‐Forsberg, O., Rohde, C., Nierenberg, A. A., & Østergaard, S. D. (2022) · JAMA Psychiatry · doi:10.1001/jamapsychiatry.2022.0337 · Cited by 59
Impact of fractures on quality of life in patients with osteoporosis: a US cross-sectional survey
Gold, D. T., Williams, S. A., Weiss, R. J., Wang, Y., Watkins, C., Carroll, J., Middleton‐Dalby, C., & Silverman, S. L. (2019) · Journal of Drug Assessment · doi:10.1080/21556660.2019.1677674 · Cited by 58
Prevalence and incidence rates of pressure ulcers in an Emergency Department
Dugaret, E., Videau, M., Faure, I., Gabinski, C., Bourdel‐Marchasson, I., & Salles, N. (2012) · International Wound Journal · doi:10.1111/j.1742-481x.2012.01103.x · Cited by 57
“not), support surface used (bed or stretcher), reason for the admission in this ED, comorbidity score (Charlson’s score (12)), list of treatment and C-reactive protein (CRP) levels (mg/l).”
BackgroundDavis, K. L., Goyal, R., Able, S. L., Brown, J., Li, L., & Kaye, J. A. (2014) · Lung Cancer · doi:10.1016/j.lungcan.2014.11.002 · Cited by 57
Health care costs of depression in patients diagnosed with cancer
Mausbach, B. T., Yeung, P., Bos, T., & Irwin, S. A. (2018) · Psycho-Oncology · doi:10.1002/pon.4716 · Cited by 57
Vest, J. R., & Ben-Assuli, O. (2019) · International Journal of Medical Informatics · doi:10.1016/j.ijmedinf.2019.06.013 · Cited by 61
“For example, we only included the Charlson index as derived from HIE data and not as calculated from only EHR data.”
BackgroundInfluentialFox, K. M., Wang, L., Gandra, S. R., Quek, R. G. W., Li, L., & Başer, O. (2016) · BMC Cardiovascular Disorders · doi:10.1186/s12872-016-0190-x · Cited by 56
“The CCI and CDS score have been widely used in many retrospective studies [25–28].”
MethodCairns, M., Moskal, P. T., Eskildsen, S. M., Ostrum, R. F., & Clement, R. C. (2018) · The Journal of Arthroplasty · doi:10.1016/j.arth.2018.04.006 · Cited by 55
Clare, L., Wu, Y., Quinn, C., Jones, I. R., Victor, C. R., Nelis, S. M., Martyr, A., Litherland, R., Pickett, J., Hindle, J. V., et al. (2018) · Alzheimer Disease & Associated Disorders · doi:10.1097/wad.0000000000000285 · Cited by 55
Levi, M., Simonetti, M., Marconi, E., Brignoli, O., Cancian, M., Masotti, A., Pegoraro, V., Heiman, F., Cricelli, C. A., & Lapi, F. (2019) · Annals of Hematology · doi:10.1007/s00277-019-03707-w · Cited by 59
Keshishian, A. V., Boytsov, N. N., Burge, R. T., Krohn, K., Lombard, L., Zhang, X., Xie, L., & Baser, O. (2017) · Journal of Managed Care & Specialty Pharmacy · doi:10.18553/jmcp.2017.17054 · Cited by 54
Hayes, C. J., Krebs, E. E., Hudson, T. J., Brown, J. D., Li, C., & Martin, B. C. (2020) · Addiction · doi:10.1111/add.14940 · Cited by 54
“Medical covariates included diagnoses for CNCP conditions, mental health conditions (schizophrenia, major depressive disorder, post-traumatic stress disorder, anxiety disorders, bipolar disorder, multiple mental health conditions), and the enhanced Charlson comorbidity score(28).”
BackgroundValore Project, Buja, A., Gini, R., Visca, M., Damiani, G., Federico, B., Francesconi, P., Donato, D., Marini, A., Donatini, A., et al. (2013) · BMC Public Health · doi:10.1186/1471-2458-13-504 · Cited by 53
“It has been demonstrated that this index is a valid and reliable method for measuring comorbidity suitable for use in clinical research and, although it was developed and validated in hospitalized patients, it has since been adapted and validated for primary care and community populations [18].”
MethodBlumenthal, K. J., Chang, Y., Ferris, T. G. G., Spirt, J., Vogeli, C., Wagle, N. W., & Metlay, J. P. (2017) · Journal of General Internal Medicine · doi:10.1007/s11606-017-4041-y · Cited by 53
“We extracted clinical diagnoses and calculated an overall outpatient Charlson Comorbidity Index based on encounter codes from medical claims data.(21,22) Comorbidities were determined based on all paid claims going back 12 months prior to the month of survey completion.”
MethodNadpara, P. A., Joyce, A. R., Murrelle, E. L., Carroll, N. W., Carroll, N. V., Barnard, M., & Zedler, B. K. (2017) · Pain Medicine · doi:10.1093/pm/pnx038 · Cited by 55
Richard‐Denis, A., Beauséjour, M., Thompson, C., Nguyen, B.-H., & Mac‐Thiong, J. (2018) · Journal of Neurotrauma · doi:10.1089/neu.2017.5403 · Cited by 53
“Less comorbidities, as quantified by the Charl-sonComorbidity Index 25 or the Maximum Comprehensive Severity Index, 26 were also associated to greater functional improvement in three studies, 14,16,19 whereas four other studies failed to demonstrate a relationship between functional outcome and the burden of comorbidit…”
study, O. B. O. T. I. T. E. O. D. A. E. A. L., Wu, Y., Clare, L., Hindle, J. V., Nelis, S. M., Martyr, A., & Matthews, F. E. (2018) · BMC Medicine · doi:10.1186/s12916-018-1135-2 · Cited by 53
Prevalence and factors associated with malnutrition in older patients with cancer.
Zhang, X., Pang, L., Sharma, S. V., Li, R.-S., Nyitray, A., & Edwards, B. (2019) · Journal of Geriatric Oncology · doi:10.1016/j.jgo.2019.01.021 · Cited by 52
Yang, Q., Wang, J., Huang, X., Xu, Y., & Zhang, Y. (2020) · BMC Psychiatry · doi:10.1186/s12888-020-02742-6 · Cited by 53
Multimorbidity in risk stratification tools to predict negative outcomes in adult population
Alonso-Morán, E., Nuño-Solínis, R., Onder, G., & Tonnara, G. (2015) · European Journal of Internal Medicine · doi:10.1016/j.ejim.2015.02.010 · Cited by 51
“It is worth noting that diseases such as COPD, CHF, cerebro-vascular disease and diabetes, were strong predictors in some of the models reviewed [10,12,15,16,21,37,39,43].”
BackgroundInfluentialWu, Y., Clare, L., Jones, I. R., Martyr, A., Nelis, S. M., Quinn, C., Victor, C. R., Lamont, R. A., Rippon, I., Matthews, F. E., et al. (2018) · International Journal of Geriatric Psychiatry · doi:10.1002/gps.4998 · Cited by 50
“Number of chronic conditions was used as an index of physical health and generated based on items from the Charlson Comorbidity Index.(20) Postcodes of people with dementia and carers were cross‐referenced to determine whether they were coresident.”
MethodImplementation of a CKD Checklist for Primary Care Providers
Mendu, M. L., Schneider, L. I., Aizer, A. A., Singh, K., Leaf, D. E., Lee, T. H.-Y., & Waikar, S. S. (2014) · Clinical Journal of the American Society of Nephrology · doi:10.2215/cjn.01660214 · Cited by 51
“We also examined whether sex, race, and an adapted Charlson comorbidity index incorporating hypertension (assigning a score of 1 to hypertension) (21,22) were confounders.”
BackgroundChen, Y., Camp, P. G., Coxson, H. O., ROAD, J. D., Guenette, J. A., Hunt, M. A., & Reid, W. D. (2016) · Archives of Physical Medicine and Rehabilitation · doi:10.1016/j.apmr.2016.10.016 · Cited by 54
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Sonig, A., Khan, I. S., Wadhwa, R., Thakur, J. D., & Nanda, A. (2012) · Neurosurgical FOCUS · doi:10.3171/2012.7.focus12193 · Cited by 50
Metadata
- Authors
- Charlson, M. E., Charlson, R. E., Peterson, J. C., Marinopoulos, S. S., Briggs, W. M., & Hollenberg, J. P.
- Affiliations
- Weill Cornell Medicine (US)
- Yale New Haven Hospital (US)
- Johns Hopkins University (US)
- Central Michigan University (US)
- Corresponding author
- Charlson, Mary E.
- Venue
- Journal of Clinical Epidemiology
- Publisher
- Elsevier BV
- Published
- 2008-12
- Volume
- 61
- Issue
- 12
- Pages
- 1234-1240
- ISSN
- 0895-4356 (ISSN-L)
- OpenAlex
- W2110548428
- Cited by
- 894
- References
- 38
- Citations by year
- 2026: 35 · 2025: 52 · 2024: 79 · 2023: 74 · 2022: 80 · 2021: 77 · 2020: 81 · 2019: 66 · 2018: 83 · 2017: 56 · 2016: 42 · 2015: 51 · 2014: 37 · 2013: 21 · 2012: 22
- FWCI
- 9.15
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Clinical Epidemiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Epidemiology › Chronic Disease Management Strategies
- Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Health Systems, Economic Evaluations, Quality of Life
- Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Healthcare Policy and Management
- Keywords
- Charlson Comorbidity Index, chronic disease costs, health care costs, primary care patients, cost prediction model, hospital costs, resource utilization (health care), hypertension, depression, warfarin, skin ulcers, cellulitis, Medicare and Medicaid, elderly patients
- MeSH terms
- Adolescent, Adult, Aged, Aged, 80 and over, Chronic Disease, Epidemiologic Methods, Female, Health Resources, Health Services Research, Hospitalization, Humans, Male, Middle Aged, New York City, Primary Health Care, Prognosis, Drug Costs, Health Care Costs, Hospital Costs, Young Adult
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