Blockchain technology has come up with solutions for the issues faced in the current healthcare system. Stakeholders and researchers can share electronic health records to find the solution to diseases. This not only improves the health sector, but it also provides information about other diseases. To maintain the security and privacy of the patient, a healthcare data gateway storage platform was created based on the blockchain technique. To overcome the problem, this article proposes a dengue diagnosis method based on nucleotides in the gene sequence, it needs only skin cells, hair, or a nail which can be collected easily from the patients. The proposed method not only diagnoses dengue, but also classifies serotypes using wavelet coefficients of EIIP indicator sequences.