Dates of service in HCC coding can span which durations?

• A. A few months long
• B. Two years long
• C. Indeterminate length
• D. A few months to two years long

Answer: (D)

Dates of service used for identifying diagnoses in HCC coding can span a window from a few months up to two years. This range exists because chronic conditions that impact risk adjustment may be documented at different times, so coders look back over history to capture relevant diagnoses. A short window (a few months) ensures recent events are included, while extending the window up to two years allows older but still relevant chronic conditions to be counted. Two years is the practical maximum used in these risk-adjustment models to balance capturing important history with keeping data manageable and relevant. That’s why the best choice reflects both ends of the spectrum: a few months to two years long.