Background: With the advancement of healthcare technology, the use of Electronic Health Records (EHR) has become more effective, providing benefits such as cost reduction, improved healthcare quality, and enhanced data recording and mobility. To remain effective, EHRs must meet requirements such as data completeness, failure resilience, high availability, and security. Pekanbaru army hospital has adopted EHR since 2022 for several main services, except for the anesthesia service. The anesthesia service still uses paper records, which are inefficient and lag behind other services. The anesthesia process, involving extensive information and coordination, greatly requires an EHR system. The development of an anesthesia module is expected to facilitate anesthesiologists and nurse anesthetists in managing patient medical information and assist in the execution of surgical procedures. Objective: This study aims to improve the functionality of the electronic health record system (EHRS) in managing medical records in the anesthesia installation service by developing an anesthesia module at the Pekanbaru Army Hospital. Method: The software development methodology used in this research is Agile Methodology where the process of analyzing user needs, collecting data, implementing the system, and evaluating and validating the system. Result: The Anesthesia Module that has been built has various features including: anesthesia patient registration, pre-anesthesia patient data recording, anesthesia induction, post-anesthesia, anesthesia reports, and integration with laboratory and radiology systems. Through testing carried out with the black box test technique, 98% of the system functionality runs well and with the user acceptance test technique, 94% of the system functionality can be accepted by users.