The situational rule for the 837P loop ID 2300 DTP segment for Admission Date reads: “Required on all ambulance claims when the patient was known to be admitted to the hospital. OR Required on all claims involving inpatient medical visits. If not required by this implementation guide, do not send.” For the second portion of this rule, two factors must both be true: The patient must be a hospital inpatient meaning that the patient has been formally admitted as such pursuant to an order for inpatient hospital admission by a physician. and, The patient had a face-to-face session with a professional health care provider, known as a medical visit. Thus, whether or not the hospital admission date must be included in a professional claim depends on factors that cannot be gleaned from other data solely within that claim, such as POS Place of Service. The only definitive way to test compliance would require examining/matching the 837I hospital inpatient claim with the 837P professional claim.