Subchorionic hematoma diagnosed at gestational age of [Number] weeks and [Number] days in a patient presenting with [Symptom, e.g., vaginal bleeding, abdominal pain, or asymptomatic found incidentally on ultrasound].  The patient reports [Severity and Character of Symptoms, e.g., mild, moderate, or severe; bright red or brown spotting; intermittent or constant cramping].  On pelvic examination, [Findings, e.g., cervical os closed, uterus non-tender, or uterine tenderness present].  Transvaginal ultrasound reveals a subchorionic hemorrhage measuring [Dimensions] located [Location relative to gestational sac or placenta].  Fetal heart rate is [Number] beats per minute and [Characterization of fetal activity, e.g., active fetal movement noted or no fetal movement visualized at this time].  Differential diagnoses considered include threatened abortion, placental abruption, and other causes of first-trimester bleeding.  Given the ultrasound findings and current clinical presentation, the diagnosis of subchorionic hemorrhage is most likely.  Plan includes pelvic rest, repeat ultrasound in [Timeframe, e.g., 1-2 weeks],  monitoring for resolution of the hematoma, and patient education regarding signs and symptoms of pregnancy complications, such as increased bleeding or severe abdominal pain.  Patient advised to contact the office immediately if symptoms worsen.  ICD-10 code O45.0 and CPT codes for the ultrasound, such as 76817 or 76801, are appropriate for this encounter.  The patient understands the diagnosis, plan, and potential complications.  Follow-up scheduled for [Date].