Patient presents with symptoms consistent with a diagnosis of Orthostatic Tachycardia Syndrome (POTS).  Key symptoms reported include orthostatic intolerance, lightheadedness, dizziness, palpitations, and near syncope upon standing or upright posture.  The patient denies chest pain, shortness of breath at rest, or loss of consciousness.  On examination, a significant increase in heart rate of at least 30 beats per minute (bpm) or a heart rate exceeding 120 bpm within 10 minutes of standing, as measured by active stand test or tilt table test, was observed, fulfilling the diagnostic criteria for POTS.  Blood pressure remained stable throughout the orthostatic challenge.  No neurological deficits were noted.  Differential diagnoses considered include other forms of orthostatic hypotension, dehydration, anemia, and anxiety disorders.  Initial laboratory workup including complete blood count (CBC), comprehensive metabolic panel (CMP), and thyroid stimulating hormone (TSH) will be performed to rule out other contributing factors.  Patient education regarding lifestyle modifications, including increased fluid and salt intake, compression stockings, and a graded exercise program, was provided.  Follow-up appointment scheduled to assess response to initial management and consider further interventions such as pharmacological management with beta-blockers or fludrocortisone if symptoms persist.  ICD-10 code I99.81, Orthostatic intolerance, will be used for billing purposes.  This diagnosis impacts medical decision making by necessitating ongoing monitoring of symptoms, medication management, and potential referral to a specialist if symptoms do not improve with initial treatment.