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Healthcare/HL7 v2/LDP
Segment

Location department

Identifies how a specific department uses a location defined in the preceding LOC, carrying the department code, hospital service, specialty type, and active or inactive status. Multiple LDP segments can follow one LOC, one per department using that location. It is used in MFN location master file messages for location and department synchronization.

12fields
2required
v2.9HL7 version
ldp.py
from zato.hl7v2.v2_9 import LDP
from zato.hl7v2.v2_9 import CWE, PL

ldp = LDP()
ldp.primary_key_value_ldp = PL(
    point_of_care='WELL',
    room='PCW',
)
ldp.location_department = CWE(
    identifier='PREV',
    text='Preventive wing',
    name_of_coding_system='HL70264',
)
Python examples

Build LDP segments in Python

How to construct and work with real-world LDP segments.

1

Preventive wing routing

Full row with services, classes, hours, phone, and cost center

from zato.hl7v2.v2_9 import LDP
from zato.hl7v2.v2_9 import CWE, PL, VH, XTN

ldp = LDP()
ldp.primary_key_value_ldp = PL(
    point_of_care='WELL',
    room='PCW-101',
    facility='WELLMAIN',
    location_status='A',
    building='B2',
    floor='3',
)
ldp.location_department = CWE(
    identifier='PREV',
    text='Preventive wing',
    name_of_coding_system='HL70264',
)
ldp.location_service = [
    CWE(
        identifier='FIT',
        text='Fitness coaching',
        name_of_coding_system='HL70069',
    ),
    CWE(
        identifier='NUT',
        text='Nutrition visit',
        name_of_coding_system='HL70069',
    ),
]
ldp.specialty_type = CWE(
    identifier='GEN',
    text='General wellness',
    name_of_coding_system='HL70265'
)
ldp.valid_patient_classes = CWE(
    identifier='AMB',
    text='Ambulatory',
    name_of_coding_system='HL70004'
)
ldp.active_inactive_flag = 'A'
ldp.activation_date_ldp = '20260401080000'
ldp.visiting_hours = [
    VH(
        start_day_range='1',
        end_day_range='5',
        start_hour_range='0800',
        end_hour_range='1700',
    ),
]
ldp.contact_phone = XTN(
    telephone_number='5551234',
    telecommunication_use_code='PRN',
    telecommunication_equipment_type='PH',
)
ldp.location_cost_center = CWE(
    identifier='CCWELL',
    text='Wellness center',
    name_of_coding_system='HL70462',
)
2

Nutrition counseling suite

Department code with screening-friendly patient class

from zato.hl7v2.v2_9 import LDP
from zato.hl7v2.v2_9 import CWE, PL

ldp = LDP()
ldp.primary_key_value_ldp = PL(
    point_of_care='WELL',
    room='NUT-2A',
    facility='WELLMAIN',
)
ldp.location_department = CWE(
    identifier='NCDEPT',
    text='Nutrition counseling',
    name_of_coding_system='HL70264',
)
ldp.valid_patient_classes = CWE(
    identifier='AMB',
    text='Ambulatory',
    name_of_coding_system='HL70004'
)
3

Fitness center seasonal pause

Inactive flag with end date and neutral closure note

from zato.hl7v2.v2_9 import LDP
from zato.hl7v2.v2_9 import PL, VH

ldp = LDP()
ldp.primary_key_value_ldp = PL(
    point_of_care='WELL',
    room='GYM-1',
    facility='WELLMAIN',
)
ldp.active_inactive_flag = 'I'
ldp.activation_date_ldp = '20260401080000'
ldp.inactivation_date_ldp = '20260901170000'
ldp.inactivated_reason = 'Seasonal layout refresh'
ldp.visiting_hours = [
    VH(
        start_day_range='1',
        end_day_range='7',
        start_hour_range='0600',
        end_hour_range='2100',
    ),
]
Tutorials

Learn by building

Step-by-step guides for working with HL7 v2 in Zato.

MLLP
Receive and parse HL7 v2 messages
Set up an MLLP channel, parse incoming messages, and respond with acknowledgments.
Start tutorial Build
Build and send HL7 v2 messages
Construct HL7 v2 messages from scratch using typed segment classes and send them over MLLP.
Start tutorial
Related segments

Commonly used with LDP

MFI Master file identification MFE Master file entry LOC Location identification LCH Location characteristic LCC Location charge code LRL Location relationship
FAQ

Frequently asked questions

LOC names the site while LDP binds a PL primary key to a department CWE, optional services, and visiting hours so wellness flows know which wing handles fitness coaching versus nutrition counseling.

Add a VH for each public window, for example weekday morning coaching versus weekend open gym blocks, each with day range and hour range components.

Use CWE with table HL70264 so receivers align the row to a department concept:

from zato.hl7v2.v2_9 import LDP
from zato.hl7v2.v2_9 import CWE

ldp = LDP()
ldp.location_department = CWE(
    identifier='PREV',
    text='Preventive wing',
    name_of_coding_system='HL70264',
)

Repeat CWE values from HL70004 to show which visit types may book the location, such as ambulatory wellness visits for a screening desk.

Field 12 ties the department row to a finance code so fitness passes, nutrition packages, and screening bundles roll up to the right wellness budget line.

Zato connects to any system that speaks HL7v2 over MLLP or FHIR over REST. This includes Epic, Cerner, Meditech, Allscripts, and other EHR platforms.

Yes, Zato has built-in MLLP support for sending and receiving HL7v2 messages. MLLP channels handle the framing protocol automatically.

Zato supports HL7 v2.9, which is backward compatible with earlier versions including v2.3, v2.5, and v2.7. Standard segments and datatypes are available as typed Python classes.

Yes. Zato handles both HL7v2 and FHIR natively, so you can parse v2 messages and build FHIR resources with IG-specific extensions in the same service. Typed Python classes are available for both protocols, including extensions from US Core, UK Core, Da Vinci, and other Implementation Guides.

Reference

LDP field reference

Complete list of fields in the LDP segment, HL7 v2.9.

#Python nameDatatypeUsageRepeatableTable
1▶primary_key_value_ldpPLRequiredNo-
2▶location_departmentCWERequiredNoHL70264
3▶location_serviceCWEOptionalYesHL70069
4▶specialty_typeCWEOptionalYesHL70265
5▶valid_patient_classesCWEOptionalYesHL70004
6active_inactive_flagIDOptionalNoHL70183
7activation_date_ldpDTMOptionalNo-
8inactivation_date_ldpDTMOptionalNo-
9inactivated_reasonSTOptionalNo-
10▶visiting_hoursVHOptionalYesHL70267
11▶contact_phoneXTNOptionalNo-
12▶location_cost_centerCWEOptionalNoHL70462

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