How does undercoding affect a hospital's MS-DRG case mix?

• A. It makes it lower than warranted by the actual service or resource intensity of the facility
• B. It makes it higher than warranted by the actual service or resource intensity of the facility
• C. It does not affect the hospital's MS-DRG case mix
• D. Coding has nothing to do with a hospital's MS-DRG case mix

Answer: (A)

Undercoding occurs when a hospital fails to document and report all relevant diagnoses and procedures that a patient received, resulting in lower reimbursement rates than what is deserved based on the actual care provided. In terms of MS-DRG (Medicare Severity Diagnosis Related Groups) case mix, undercoding leads to a misrepresentation of the hospital's true resource intensity and patient acuity.

When a hospital undercodes, it reflects a case mix that appears less complex and resource-intensive than it genuinely is. This can negatively impact the hospital's financial health, as it may receive lower payments from Medicare and other payers, which base their reimbursements on the documented severity of patient cases. A lower case mix index may also indicate fewer resources being allocated to the facility, which can lead to inadequate funding for services and potentially compromise patient care quality.

Understanding the implications of undercoding helps emphasize the importance of accurate and thorough documentation and coding practices in reflecting the true nature of hospital services rendered.