The research study focused on Unified Coded Error Correction for grammatical and mechanical inaccuracies among selected Grade 10 students. Specifically, it aimed to determine the most persistent error in grammar and mechanics and the level of implication of the teacher?s use of unified coded error correction to English 10 learners writing inaccuracies with respect to Familiarity of Error Codes and Flexibility in Marking. The research involved thirty (30) selected Grade 10 Students by Purposive Sampling technique. The findings of the study would have a significant impact in the decision-making of the Curriculum Planners, Teachers, Learners, Future Researchers and Writers as the results will be a basis on the use of correction codes to improve written works. The Error chart by Johanna Klassen was used for determining the frequency of persistent errors found in the essay, and one group design for the pre-test and post-test, also for the questionnaire with regards to familiarity of codes and flexibility in marking to determine its level of implication of the use of the said correction codes. The results of the study revealed that he most persistent error in mechanics is capitalization; in grammar as to noun is the use of Pronouns; in grammar as to verbs are the incorrect verb; in grammar under modifiers is the use of adjectives; in grammar under prepositions and syntax is word order; in grammar under lexical items and connectors are omission and redundancy. The null hypothesis, ?There is a significant difference in the pre-test and post-test scores of Grade 10 students with the use of unified code error correction? is rejected. It means that the use of unified coded error correction to treat grammatical and mechanical accuracies has a positive effect, seeing that errors were lessened in the post test. The findings showed that the use of Unified Coded Error Correction has a significant impact on the decision-making of the curriculum planners, teachers, learners, future researchers, and writers. The results will be a basis for the use of correction codes to improve written works.

Coded Error Correction; Grammar; Mechanics; Unified approach