This code system http://terminology.hl7.org/CodeSystem/ex-diagnosistype defines the following codes:
| Code | Display | Definition |
| admitting | Admitting Diagnosis | The diagnosis given as the reason why the patient was admitted to the hospital. |
| clinical | Clinical Diagnosis | A diagnosis made on the basis of medical signs and patient-reported symptoms, rather than diagnostic tests. |
| differential | Differential Diagnosis | One of a set of the possible diagnoses that could be connected to the signs, symptoms, and lab findings. |
| discharge | Discharge Diagnosis | The diagnosis given when the patient is discharged from the hospital. |
| laboratory | Laboratory Diagnosis | A diagnosis based significantly on laboratory reports or test results, rather than the physical examination of the patient. |
| nursing | Nursing Diagnosis | A diagnosis which identifies people's responses to situations in their lives, such as a readiness to change or a willingness to accept assistance. |
| prenatal | Prenatal Diagnosis | A diagnosis determined prior to birth. |
| principal | Principal Diagnosis | The single medical diagnosis that is most relevant to the patient's chief complaint or need for treatment. |
| radiology | Radiology Diagnosis | A diagnosis based primarily on the results from medical imaging studies. |
| remote | Remote Diagnosis | A diagnosis determined using telemedicine techniques. |
| retrospective | Retrospective Diagnosis | The labeling of an illness in a specific historical event using modern knowledge, methods and disease classifications. |
| self | Self Diagnosis | A diagnosis determined by the patient. |