A healthy patient presents to his annual wellness visit. The medical assistant (MA) notifies the patient his usual physician is out of the office so he will be seen by another provider on staff. The patient seems frustrated, explaining he has been a patient for at least 10 years and has never seen a different physician. The MA takes his blood pressure and it is 178/92. Noting this is abnormal for this particular patient, she takes the BP again after the patient is seen by the doctor. The second reading was 145/78. What ICD-10 code is assigned?