What Is Risk Adjustment?
Risk adjustment is a methodology used by CMS to predict healthcare costs for a given population based on demographic factors and diagnosed conditions. Hierarchical Condition Categories (HCCs) group ICD-10-CM diagnosis codes into categories that carry a risk score, which is used to adjust capitated payments to Medicare Advantage plans and certain accountable care organizations.
How HCC Coding Works
Each qualifying diagnosis code maps to an HCC, and each HCC carries a relative factor (RAF) value. A beneficiary's total risk score is the sum of applicable HCC values plus demographic factors. Higher risk scores result in higher capitated payments, reflecting the anticipated cost of caring for a sicker population.
The MEAT Standard
To be coded, a chronic condition must be documented as Monitored, Evaluated, Assessed, or Treated (MEAT) during the encounter, and must be coded at least once per calendar year (or per encounter, depending on the model) to remain part of the risk score. A condition simply listed in a problem list without supporting MEAT documentation should not be coded for risk adjustment purposes.
Common Coding Challenges
- Ensuring chronic conditions are re-documented and re-coded annually, since HCC scores reset each calendar year
- Capturing the full specificity of diabetes with manifestations, since combination codes affect HCC mapping
- Avoiding "coding to the highest specificity" errors that overstate severity without clinical support
- Recognizing hierarchical exclusions, where a more severe condition in the same hierarchy supersedes a less severe one
Compliance Risk
Because risk adjustment directly affects capitated payment, both under-coding and over-coding create compliance exposure. The OIG has specifically targeted Medicare Advantage risk adjustment data validation (RADV) audits to identify unsupported HCC coding.
HIM's Role
- Auditing HCC coding accuracy against source documentation
- Educating providers on MEAT documentation requirements
- Supporting annual wellness visit documentation to capture chronic condition status
- Participating in RADV audit preparation and response
Exam Tip
Be able to explain the MEAT standard and why HCC coding differs from standard inpatient coding in its annual recapture requirement.