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Aim: To clarify whether the Whitney Comorbidity Index (WCI) is useful in Asian adults with cerebral palsy (CP) and whether aspiration pneumonia and pressure ulcers improved the prognostic significance of the WCI. Method: This cohort study evaluated individuals aged at least 18 years with CP in Japan. We used Cox proportional hazards regression to analyse 2‐year mortality rates. The predictive performance of the Charlson Comorbidity Index, Elixhauser Comorbidity Index, and WCI were compared as comorbidity assessment criteria. Aspiration pneumonia and pressure ulcers were added to the Cox models, and their impact on hazard ratios was determined. Results: Of the 2232 adults with CP, 72 died during the 2 years. The model with a previously reported weighted WCI with aspiration pneumonia and pressure ulcers produced the best fit. Additionally, the hazard risk of 2‐year mortality for an unweighted WCI score of at least 4 was 2.56; when CP‐specific comorbidities were added, it increased to 8.94. Interpretation: This study showed that the WCI can be used in Asian adults with CP. Furthermore, assessing patient age, aspiration pneumonia, and pressure ulcers in addition to the WCI increased the predictive value for mortality. Our findings indicate that the WCI can promote valid comparisons between international populations. What this paper adds: The Whitney Comorbidity Index (WCI) is useful among adults with cerebral palsy, irrespective of ethnic differences.Assessment of aspiration pneumonia and pressure ulcers increased the WCI predictive value.The WCI helps identify adults with cerebral palsy at risk of adverse outcomes. What this paper adds: The Whitney Comorbidity Index (WCI) is useful among adults with cerebral palsy, irrespective of ethnic differences.Assessment of aspiration pneumonia and pressure ulcers increased the WCI predictive value.The WCI helps identify adults with cerebral palsy at risk of adverse outcomes. This article's abstract has been translated into Japanese. Follow the links from the abstract to view the translations. [ABSTRACT FROM AUTHOR]