Szablon danych ścieżki pacjenta

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Patient Registered'
    , EventEndDateTime = FORMAT(E.REG_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = P.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = 'N/A'
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1) /* Days */
    , IsReadmission = '0' /* Calculate in Tool */
    , DiagnosisCode = 'N/A'
FROM
    ENCOUNTER E
    , PERSON P
    , PRSNL PR
WHERE
    E.REG_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND E.PERSON_ID = P.PERSON_ID
    AND E.REG_PRSNL_ID = PR.PERSON_ID
    AND E.ACTIVE_IND = 1

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Triage Assessment Completed'
    , EventEndDateTime = FORMAT(CE.EVENT_END_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = CE.EVENT_TAG
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    CLINICAL_EVENT CE
    , ENCOUNTER E
    , PRSNL PR
WHERE
    CE.EVENT_END_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND CE.EVENT_CD IN ([REPLACE_WITH_TRIAGE_EVENT_CD]) /* e.g., Triage Acuity */
    AND CE.VALID_UNTIL_DT_TM > CNVTDATETIME(CURDATE, CURTIME3)
    AND CE.ENCNTR_ID = E.ENCNTR_ID
    AND CE.PERFORMED_PRSNL_ID = PR.PERSON_ID

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Diagnostic Order Placed'
    , EventEndDateTime = FORMAT(O.ORIG_ORDER_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = O.ORDER_MNEMONIC
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    ORDERS O
    , ENCOUNTER E
    , PRSNL PR
WHERE
    O.ORIG_ORDER_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND O.CATALOG_TYPE_CD IN ([REPLACE_WITH_LAB_RAD_CODES]) /* General Lab, Radiology */
    AND O.ENCNTR_ID = E.ENCNTR_ID
    AND O.ORDER_STATUS_CD != [REPLACE_WITH_CANCELED_CODE]
    AND O.STATUS_PRSNL_ID = PR.PERSON_ID

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Procedure Scheduled'
    , EventEndDateTime = FORMAT(SCT.UPDT_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = 'Surgical Case'
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    SURG_CASE_TBL SCT
    , ENCOUNTER E
    , PRSNL PR
WHERE
    SCT.UPDT_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND SCT.ENCNTR_ID = E.ENCNTR_ID
    AND SCT.UPDT_ID = PR.PERSON_ID

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Diagnosis Documented'
    , EventEndDateTime = FORMAT(D.DIAG_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = D.DIAGNOSIS_DISPLAY
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = D.DIAGNOSIS_DISPLAY
FROM
    DIAGNOSIS D
    , ENCOUNTER E
    , PRSNL PR
WHERE
    D.DIAG_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND D.ENCNTR_ID = E.ENCNTR_ID
    AND D.ACTIVE_IND = 1
    AND D.DIAG_PRSNL_ID = PR.PERSON_ID

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Care Plan Activated'
    , EventEndDateTime = FORMAT(PWC.START_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = PWC.DESCRIPTION
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    ACT_PW_COMP PWC
    , ENCOUNTER E
    , PRSNL PR
WHERE
    PWC.START_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND PWC.ENCNTR_ID = E.ENCNTR_ID
    AND PWC.ACTIVE_IND = 1
    AND PWC.START_PRSNL_ID = PR.PERSON_ID

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Medication Administered'
    , EventEndDateTime = FORMAT(CE.EVENT_END_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = CE.EVENT_TAG
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    CLINICAL_EVENT CE
    , ENCOUNTER E
    , PRSNL PR
WHERE
    CE.EVENT_END_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND CE.EVENT_CLASS_CD = [REPLACE_WITH_MED_ADMIN_CLASS] /* e.g., 232 (MED) */
    AND CE.ENCNTR_ID = E.ENCNTR_ID
    AND CE.VALID_UNTIL_DT_TM > CNVTDATETIME(CURDATE, CURTIME3)
    AND CE.PERFORMED_PRSNL_ID = PR.PERSON_ID

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Diagnostic Result Verified'
    , EventEndDateTime = FORMAT(CE.VERIFIED_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = CE.EVENT_TAG
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    CLINICAL_EVENT CE
    , ENCOUNTER E
    , PRSNL PR
WHERE
    CE.VERIFIED_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND CE.EVENT_CLASS_CD IN ([REPLACE_WITH_LAB_RAD_CLASS_CODES])
    AND CE.RESULT_STATUS_CD = [REPLACE_WITH_AUTH_STATUS_CD]
    AND CE.ENCNTR_ID = E.ENCNTR_ID
    AND CE.VERIFIED_PRSNL_ID = PR.PERSON_ID

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Procedure Performed'
    , EventEndDateTime = FORMAT(SCT.SURG_START_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = 'N/A'
    , OrderMnemonic = 'Surgical Case'
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    SURG_CASE_TBL SCT
    , ENCOUNTER E
WHERE
    SCT.SURG_START_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND SCT.ENCNTR_ID = E.ENCNTR_ID

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Department Transfer Occurred'
    , EventEndDateTime = FORMAT(ELH.BEG_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(ELH.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = 'Transfer'
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    ENCNTR_LOC_HIST ELH
    , ENCOUNTER E
    , PRSNL PR
WHERE
    ELH.BEG_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND ELH.ENCNTR_ID = E.ENCNTR_ID
    AND ELH.UPDT_ID = PR.PERSON_ID
    AND ELH.ACTIVE_IND = 1

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Consultation Completed'
    , EventEndDateTime = FORMAT(CE.EVENT_END_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = CE.EVENT_TAG
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    CLINICAL_EVENT CE
    , ENCOUNTER E
    , PRSNL PR
WHERE
    CE.EVENT_END_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND CE.EVENT_CD IN ([REPLACE_WITH_CONSULT_NOTE_CODES])
    AND CE.ENCNTR_ID = E.ENCNTR_ID
    AND CE.PERFORMED_PRSNL_ID = PR.PERSON_ID

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Discharge Order Signed'
    , EventEndDateTime = FORMAT(O.ORIG_ORDER_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = O.ORDER_MNEMONIC
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    ORDERS O
    , ENCOUNTER E
    , PRSNL PR
WHERE
    O.ORIG_ORDER_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND O.ORDER_MNEMONIC = '*Discharge*'
    AND O.ENCNTR_ID = E.ENCNTR_ID
    AND O.STATUS_PRSNL_ID = PR.PERSON_ID

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Patient Discharged'
    , EventEndDateTime = FORMAT(E.DISCH_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = E.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = 'N/A'
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    ENCOUNTER E
    , PERSON P
    , PRSNL PR
WHERE
    E.DISCH_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND E.PERSON_ID = P.PERSON_ID
    AND E.ACTIVE_IND = 1
    AND E.UPDT_ID = PR.PERSON_ID

UNION ALL

SELECT
    EncounterId = E.ENCNTR_ID
    , ClinicalEventTag = 'Follow-up Appointment Scheduled'
    , EventEndDateTime = FORMAT(SA.UPDT_DT_TM, 'YYYY-MM-DD HH:MM:SS')
    , SourceSystem = 'Cerner'
    , LastDataUpdate = FORMAT(CNVTDATETIME(CURDATE, CURTIME3), 'YYYY-MM-DD HH:MM:SS')
    , PersonId = SA.PERSON_ID
    , EncounterType = UAR_GET_CODE_DISPLAY(E.ENCNTR_TYPE_CD)
    , NurseUnit = UAR_GET_CODE_DISPLAY(E.LOC_NURSE_UNIT_CD)
    , PerformingPrsnlId = PR.NAME_FULL_FORMATTED
    , OrderMnemonic = 'Follow-up'
    , DischargeDisposition = UAR_GET_CODE_DISPLAY(E.DISCH_DISPOSITION_CD)
    , LengthOfStay = DATETIFF(E.DISCH_DT_TM, E.REG_DT_TM, 1)
    , IsReadmission = '0'
    , DiagnosisCode = 'N/A'
FROM
    SCH_APPOINTMENT SA
    , ENCOUNTER E
    , PRSNL PR
WHERE
    SA.UPDT_DT_TM BETWEEN CNVTDATETIME($start_date) AND CNVTDATETIME($end_date)
    AND SA.ENCNTR_ID = E.ENCNTR_ID
    AND SA.BEG_DT_TM > E.DISCH_DT_TM
    AND SA.SCH_STATE_CD != [REPLACE_WITH_CANCELED_STATE_CD]
    AND SA.UPDT_ID = PR.PERSON_ID

import requests
import pandas as pd
import time
from datetime import datetime, timedelta

class=class="hl-string">"hl-comment"># === CONFIGURATION ===
FHIR_BASE_URL = class="hl-string">"https://fhir-ehr.cerner.com/r4/ec2458f2-1e24-41c8-b71b-0e701af7583d"  class=class="hl-string">"hl-comment"># Placeholder
CLIENT_ID = class="hl-string">"[YOUR_CLIENT_ID]"
CLIENT_SECRET = class="hl-string">"[YOUR_CLIENT_SECRET]"
TOKEN_URL = class="hl-string">"https://authorization.cerner.com/tenants/ec2458f2-1e24-41c8-b71b-0e701af7583d/protocols/oauth2/profiles/smart-v1/token"

class=class="hl-string">"hl-comment"># Standard headers
HEADERS = {
    class="hl-string">"Accept": class="hl-string">"application/fhir+json",
    class="hl-string">"Content-Type": class="hl-string">"application/json"
}

class=class="hl-string">"hl-comment"># === AUTHENTICATION ===
def get_access_token():
    class=class="hl-string">"hl-comment"># Basic OAuth2 Client Credentials implementation
    class=class="hl-string">"hl-comment"># Adjust for specific SMART on FHIR flows if needed
    payload = {
        class="hl-string">"grant_type": class="hl-string">"client_credentials",
        class="hl-string">"client_id": CLIENT_ID,
        class="hl-string">"client_secret": CLIENT_SECRET,
        class="hl-string">"scope": class="hl-string">"system/Encounter.read system/Patient.read system/Observation.read system/Procedure.read system/Condition.read system/MedicationAdministration.read system/ServiceRequest.read"
    }
    try:
        response = requests.post(TOKEN_URL, data=payload, auth=(CLIENT_ID, CLIENT_SECRET))
        response.raise_for_status()
        return response.json()[class="hl-string">"access_token"]
    except Exception as e:
        print(fclass="hl-string">"Auth failed: {e}")
        return None

class=class="hl-string">"hl-comment"># === API HELPER ===
def fetch_resource(url, token):
    resources = []
    headers = HEADERS.copy()
    headers[class="hl-string">"Authorization"] = fclass="hl-string">"Bearer {token}"
    
    while url:
        try:
            resp = requests.get(url, headers=headers)
            if resp.status_code == 429:
                time.sleep(2)
                continue
            resp.raise_for_status()
            data = resp.json()
            
            if class="hl-string">'entry' in data:
                resources.extend([item[class="hl-string">'resource'] for item in data[class="hl-string">'entry']])
            
            class=class="hl-string">"hl-comment"># Handle Pagination
            url = None
            for link in data.get(class="hl-string">'link', []):
                if link[class="hl-string">'relation'] == class="hl-string">'next':
                    url = link[class="hl-string">'url']
                    break
        except Exception as e:
            print(fclass="hl-string">"Error fetching {url}: {e}")
            break
    return resources

class=class="hl-string">"hl-comment"># === MAIN EXTRACTION ===
def extract_patient_journey(start_date, end_date):
    token = get_access_token()
    if not token:
        return

    class=class="hl-string">"hl-comment"># 1. Fetch Encounters (Episodes)
    print(class="hl-string">"Fetching Encounters...")
    enc_url = fclass="hl-string">"{FHIR_BASE_URL}/Encounter?date=ge{start_date}&date=le{end_date}"
    encounters = fetch_resource(enc_url, token)
    
    event_log = []

    print(fclass="hl-string">"Processing {len(encounters)} encounters...")
    
    for enc in encounters:
        enc_id = enc.get(class="hl-string">'id')
        patient_id = enc.get(class="hl-string">'subject', {}).get(class="hl-string">'reference', class="hl-string">'').replace(class="hl-string">'Patient/', class="hl-string">'')
        enc_type = enc.get(class="hl-string">'class', {}).get(class="hl-string">'code', class="hl-string">'Unknown')
        
        class=class="hl-string">"hl-comment"># Helper to append event
        def add_event(tag, timestamp, order_item=None, location=None):
            if timestamp:
                event_log.append({
                    class="hl-string">"EncounterId": enc_id,
                    class="hl-string">"PersonId": patient_id,
                    class="hl-string">"ClinicalEventTag": tag,
                    class="hl-string">"EventEndDateTime": timestamp,
                    class="hl-string">"SourceSystem": class="hl-string">"OracleHealth_Cerner",
                    class="hl-string">"EncounterType": enc_type,
                    class="hl-string">"NurseUnit": location,
                    class="hl-string">"OrderMnemonic": order_item,
                    class="hl-string">"LastDataUpdate": datetime.now().isoformat()
                })

        class=class="hl-string">"hl-comment"># --- Activity 1: Patient Registered ---
        start_time = enc.get(class="hl-string">'period', {}).get(class="hl-string">'start')
        add_event(class="hl-string">"Patient Registered", start_time)

        class=class="hl-string">"hl-comment"># --- Activity 13: Patient Discharged ---
        end_time = enc.get(class="hl-string">'period', {}).get(class="hl-string">'end')
        class=class="hl-string">"hl-comment"># Activity 12: Discharge Order Signed (Inferred from status or specific request)
        class=class="hl-string">"hl-comment"># For simplicity, if end_time exists, we assume discharge order preceded it slightly or check ServiceRequest
        add_event(class="hl-string">"Patient Discharged", end_time)

        class=class="hl-string">"hl-comment"># --- Activity 10: Department Transfer Occurred ---
        locations = enc.get(class="hl-string">'location', [])
        for i, loc in enumerate(locations):
            loc_name = loc.get(class="hl-string">'location', {}).get(class="hl-string">'display', class="hl-string">'Unknown Unit')
            loc_start = loc.get(class="hl-string">'period', {}).get(class="hl-string">'start')
            class=class="hl-string">"hl-comment"># Skip the first location as it's usually registration
            if i > 0 and loc_start:
                add_event(class="hl-string">"Department Transfer Occurred", loc_start, location=loc_name)

        class=class="hl-string">"hl-comment"># === FETCH SUB-RESOURCES ===
        class=class="hl-string">"hl-comment"># Note: In production, consider batch requests or bulk export if available to avoid N+1 queries
        
        class=class="hl-string">"hl-comment"># --- Activity 5: Diagnosis Documented ---
        cond_url = fclass="hl-string">"{FHIR_BASE_URL}/Condition?patient={patient_id}&encounter={enc_id}"
        conditions = fetch_resource(cond_url, token)
        for cond in conditions:
            dx_name = cond.get(class="hl-string">'code', {}).get(class="hl-string">'text', class="hl-string">'Unknown Diagnosis')
            dx_time = cond.get(class="hl-string">'recordedDate') or cond.get(class="hl-string">'onsetDateTime')
            add_event(class="hl-string">"Diagnosis Documented", dx_time, order_item=dx_name)

        class=class="hl-string">"hl-comment"># --- Activity 9: Procedure Performed ---
        proc_url = fclass="hl-string">"{FHIR_BASE_URL}/Procedure?patient={patient_id}&encounter={enc_id}"
        procedures = fetch_resource(proc_url, token)
        for proc in procedures:
            if proc.get(class="hl-string">'status') == class="hl-string">'completed':
                proc_name = proc.get(class="hl-string">'code', {}).get(class="hl-string">'text', class="hl-string">'Unknown Procedure')
                proc_time = proc.get(class="hl-string">'performedDateTime')
                add_event(class="hl-string">"Procedure Performed", proc_time, order_item=proc_name)

        class=class="hl-string">"hl-comment"># --- Activity 7: Medication Administered ---
        med_url = fclass="hl-string">"{FHIR_BASE_URL}/MedicationAdministration?patient={patient_id}&encounter={enc_id}"
        meds = fetch_resource(med_url, token)
        for med in meds:
            if med.get(class="hl-string">'status') == class="hl-string">'completed':
                med_name = med.get(class="hl-string">'medicationCodeableConcept', {}).get(class="hl-string">'text', class="hl-string">'Unknown Med')
                med_time = med.get(class="hl-string">'effectiveDateTime')
                add_event(class="hl-string">"Medication Administered", med_time, order_item=med_name)

        class=class="hl-string">"hl-comment"># --- Activity 2, 8: Observations (Triage & Labs) ---
        obs_url = fclass="hl-string">"{FHIR_BASE_URL}/Observation?patient={patient_id}&encounter={enc_id}"
        observations = fetch_resource(obs_url, token)
        for obs in observations:
            obs_code = obs.get(class="hl-string">'code', {}).get(class="hl-string">'text', class="hl-string">'')
            obs_time = obs.get(class="hl-string">'effectiveDateTime') or obs.get(class="hl-string">'issued')
            categories = [c.get(class="hl-string">'code') for cat in obs.get(class="hl-string">'category', []) for c in cat.get(class="hl-string">'coding', [])]
            
            if class="hl-string">'triage' in str(categories).lower() or class="hl-string">'acuity' in obs_code.lower():
                add_event(class="hl-string">"Triage Assessment Completed", obs_time, order_item=obs_code)
            elif class="hl-string">'laboratory' in str(categories).lower() and obs.get(class="hl-string">'status') == class="hl-string">'final':
                add_event(class="hl-string">"Diagnostic Result Verified", obs_time, order_item=obs_code)

        class=class="hl-string">"hl-comment"># --- Activity 3, 4, 12: Service Requests (Orders) ---
        req_url = fclass="hl-string">"{FHIR_BASE_URL}/ServiceRequest?patient={patient_id}&encounter={enc_id}"
        requests_list = fetch_resource(req_url, token)
        for req in requests_list:
            req_name = req.get(class="hl-string">'code', {}).get(class="hl-string">'text', class="hl-string">'Unknown Order')
            req_time = req.get(class="hl-string">'authoredOn')
            intent = req.get(class="hl-string">'intent')
            
            if intent == class="hl-string">'order':
                class=class="hl-string">"hl-comment"># Simple logic to distinguish Labs vs other orders based on code or category
                add_event(class="hl-string">"Diagnostic Order Placed", req_time, order_item=req_name)
            elif intent == class="hl-string">'plan':
                 add_event(class="hl-string">"Procedure Scheduled", req_time, order_item=req_name)
            
            class=class="hl-string">"hl-comment"># Discharge Order Logic (Placeholder: Check for specific discharge code)
            if class="hl-string">"discharge" in req_name.lower():
                add_event(class="hl-string">"Discharge Order Signed", req_time)

        class=class="hl-string">"hl-comment"># --- Activity 6: Care Plan Activated ---
        cp_url = fclass="hl-string">"{FHIR_BASE_URL}/CarePlan?patient={patient_id}&encounter={enc_id}"
        careplans = fetch_resource(cp_url, token)
        for cp in careplans:
            cp_start = cp.get(class="hl-string">'period', {}).get(class="hl-string">'start')
            add_event(class="hl-string">"Care Plan Activated", cp_start)

        class=class="hl-string">"hl-comment"># --- Activity 11: Consultation Completed ---
        class=class="hl-string">"hl-comment"># Often DocumentReference
        doc_url = fclass="hl-string">"{FHIR_BASE_URL}/DocumentReference?patient={patient_id}&encounter={enc_id}"
        docs = fetch_resource(doc_url, token)
        for doc in docs:
            type_text = doc.get(class="hl-string">'type', {}).get(class="hl-string">'text', class="hl-string">'').lower()
            if class="hl-string">'consult' in type_text or class="hl-string">'note' in type_text:
                doc_date = doc.get(class="hl-string">'date') class=class="hl-string">"hl-comment"># When document was created/signed
                add_event(class="hl-string">"Consultation Completed", doc_date, order_item=type_text)
        
        class=class="hl-string">"hl-comment"># --- Activity 14: Follow-up Appointment Scheduled ---
        class=class="hl-string">"hl-comment"># Check for appointments created strictly after encounter start, linked to patient
        apt_url = fclass="hl-string">"{FHIR_BASE_URL}/Appointment?patient={patient_id}&date=ge{start_time}"
        appointments = fetch_resource(apt_url, token)
        for apt in appointments:
            created_date = apt.get(class="hl-string">'created') class=class="hl-string">"hl-comment"># When the booking happened
            if created_date and start_time and created_date >= start_time:
                 add_event(class="hl-string">"Follow-up Appointment Scheduled", created_date)

    class=class="hl-string">"hl-comment"># === EXPORT ===
    df = pd.DataFrame(event_log)
    class=class="hl-string">"hl-comment"># Basic cleaning
    df.drop_duplicates(inplace=True)
    df.fillna(class="hl-string">'', inplace=True)
    
    output_file = class="hl-string">"cerner_extraction.csv"
    df.to_csv(output_file, index=False)
    print(fclass="hl-string">"Extraction complete. Saved to {output_file}")

class=class="hl-string">"hl-comment"># Run extraction for a specific window
extract_patient_journey(class="hl-string">"2023-01-01", class="hl-string">"2023-01-07")