--- title: Keeping a Healthy CMI | Case Mix Index description: A higher CMI corresponds to increased consumption of resources and increased cost of patient care, resulting in increased reimbursement to the facility from government and private payers, like CMS. We know that documentation directly impacts coding. image: https://hiacode.com/hubfs/Imported_Blog_Media/iStock-635894512-2.jpg --- # Keeping a Healthy CMI | Case Mix Index ![HIAcode](https://hiacode.com/hubfs/Logos/HIA_RGB_PrimaryLogo_Icon%20(1)_Artboard%201.png) [HIAcode](https://hiacode.com/blog/author/hiacode) Jun 14, 2019 [Industry News](https://hiacode.com/blog/tag/industry-news) ![Keeping a Healthy CMI | Case Mix Index](https://hiacode.com/hubfs/Imported_Blog_Media/iStock-635894512-2.jpg) - Share on: - [![](https://hiacode.com/hubfs/Facebook%20svg.svg)](http://www.facebook.com/share.php?u=https://hiacode.com/blog/education/keeping-a-healthy-cmi) - [![](https://hiacode.com/hs-fs/hubfs/twitter.png?width=32&height=32&name=twitter.png)](https://twitter.com/intent/tweet?text=I+found+this+interesting+blog+post&url=https://hiacode.com/blog/education/keeping-a-healthy-cmi) - [![](https://hiacode.com/hubfs/LinkedIn%20svg.svg)](http://www.linkedin.com/shareArticle?mini=true&url=https://hiacode.com/blog/education/keeping-a-healthy-cmi) - [![](https://hiacode.com/hubfs/mdi_email.svg)](mailto:?subject=Check%20out%20https://hiacode.com/blog/education/keeping-a-healthy-cmi%20&body=Check%20out%20https://hiacode.com/blog/education/keeping-a-healthy-cmi&media=https://20824215.fs1.hubspotusercontent-na1.net/hubfs/20824215/Imported_Blog_Media/iStock-635894512-2.jpg) - ![](https://hiacode.com/hubfs/entypo_link.svg) copied Case Mix Index, CMI, is a metric used to measure the relative cost needed to treat a hospital’s patients. A higher case mix reflects a sicker patient population. CMS then uses this measurement to help calculate payments. CMI is calculated based on average sum of relative weights of DRGs of all patients treated during a specific time period.   A higher CMI corresponds to increased consumption of resources and increased cost of patient care, resulting in increased reimbursement to the facility from government and private payers, like CMS. We know that documentation directly impacts coding. Therefore, if a physician does not document all the services the patient received or if the coding is not accurate, the result could be undercoding, lowering your overall CMI and leaving revenue on the table. Look at the example below to see how HIA’s findings impacted our client’s CMI.   [![Case Mix Index, CMI, is a metric used to measure the relative cost needed to treat a hospital’s patients.](https://hiacode.com/hs-fs/hubfs/Imported_Blog_Media/Improving-CMI-1.png?width=850&height=149&name=Improving-CMI-1.png) ![Case Mix Index, CMI, is a metric used to measure the relative cost needed to treat a hospital’s patients.](https://hiacode.com/hs-fs/hubfs/Imported_Blog_Media/Improving-CMI-1.png?width=850&height=149&name=Improving-CMI-1.png) ](https://hiacode.com/hubfs/Imported_Blog_Media/Improving-CMI-1.png) Overall Potential Reimbursement Impact: Potential increase of $2,552,125.32 when extrapolated across the 2018 inpatient discharges (using 6,282 as annual number of accounts). CMI based on accounts reviewed not overall casemix. Reimbursment based on $6,958.97 facility base rate.   Ensure the health of your facility’s CMI by scheduling regular coding audits with HIA.  [LEARN MORE](https://hiacode.com/case-mix-index) ##### [Previous](https://hiacode.com/blog/education/procedure-coding-for-a-breast-procedure) ### [Coder Q&A: Procedure Coding for a Breast Procedure](https://hiacode.com/blog/education/procedure-coding-for-a-breast-procedure) ##### [Next](https://hiacode.com/blog/education/find-your-routine-track-trends-to-save-time) ### [Find Your Routine: Track Trends to Save Time](https://hiacode.com/blog/education/find-your-routine-track-trends-to-save-time) Serach Blog Post ## Need to Earn CEUs? Our coding education platform, HIAlearn.com, offers courses related to this topic and many more. 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