Patient presents with low oxygen saturation (hypoxemia), evidenced by SpO2 readings below 90% on room air.  Presenting symptoms include dyspnea, shortness of breath, and tachypnea.  Patient's respiratory rate is elevated at [insert value] breaths per minute.  Oxygen saturation levels were monitored continuously via pulse oximetry.  Assessment for underlying causes of hypoxemia included evaluation for pneumonia, chronic obstructive pulmonary disease (COPD), asthma, acute respiratory distress syndrome (ARDS), and pulmonary embolism.  Cardiac evaluation was performed to assess for heart failure or other cardiac contributions to the hypoxemia.  Arterial blood gas (ABG) analysis revealed [insert ABG values, e.g., PaO2, PaCO2, pH, bicarbonate].  Treatment plan includes supplemental oxygen therapy via nasal cannula at [insert flow rate] liters per minute to maintain SpO2 above 90%.  Patient's response to oxygen therapy will be closely monitored, and further diagnostic testing may be indicated based on clinical course.  Differential diagnosis includes conditions such as anemia, sleep apnea, and high altitude sickness.  Patient education provided on the importance of oxygen therapy adherence and follow-up care.  ICD-10 code [insert appropriate ICD-10 code, e.g., R09.02] applied.