Patient presents with subungual hematoma, characterized by blood trapped under the nail plate.  Onset of pain and discoloration, described as [color; e.g., dark red, purplish, black], beneath the affected nail [finger or toe; e.g., right index fingernail] was [onset timing; e.g., two days ago] after [mechanism of injury; e.g., striking finger with a hammer].  Patient reports [pain level; e.g., mild, moderate, severe] throbbing pain exacerbated by pressure.  Physical exam reveals [size and location of hematoma; e.g., 5mm x 3mm subungual hematoma beneath the distal half of the nail plate].  The overlying nail plate is intact with no visible fractures.  Capillary refill is brisk.  Peripheral pulses are palpable and strong.  Diagnosis of subungual hematoma confirmed based on clinical presentation and history.  Treatment options, including trephination for pain relief if indicated due to pressure and hematoma size, were discussed.  Patient education provided regarding pain management with [analgesic; e.g., over-the-counter ibuprofen], elevation, and signs of infection.  Follow-up recommended if symptoms worsen or do not improve within [ timeframe; e.g., two weeks].  ICD-10 code S60.111A (Contusion of right index finger with subungual hematoma, initial encounter) assigned.