Patient presents with complaints consistent with gastroesophageal reflux disease (GERD), also known as acid reflux or heartburn.  Symptoms include postprandial pyrosis, regurgitation of acidic material, and a burning sensation in the chest.  The patient reports experiencing these symptoms several times per week, particularly after consuming large meals or lying down after eating.  Symptoms interfere with sleep and daily activities.  The patient denies dysphagia, odynophagia, or weight loss.  Physical examination reveals no significant abnormalities.  Differential diagnoses include esophageal spasm, peptic ulcer disease, and angina pectoris.  Initial management includes lifestyle modifications such as dietary adjustments, weight loss if indicated, and elevation of the head of the bed.  Pharmacological therapy is initiated with a proton pump inhibitor (PPI), specifically omeprazole 20 mg once daily before breakfast.  Patient education provided on GERD triggers, management strategies, and potential complications including Barrett's esophagus.  Follow-up scheduled in four weeks to assess symptom improvement and discuss further diagnostic testing if necessary, such as upper endoscopy or esophageal pH monitoring.  ICD-10 code K21.9 for gastro-esophageal reflux disease without esophagitis is assigned.  CPT codes for the evaluation and management visit, as well as for any procedures performed, will be documented accordingly.