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Healthcare/HL7 v2/GP2
Segment

Grouping/reimbursement - procedure line item

Carries procedure-line-item-level grouping and reimbursement data for CMS APC processing, including revenue code linked to procedure codes, modifier codes, payment adjustment code, and packaging status. It complements GP1 by providing line-item detail for each procedure within a visit, used in the same U.S. outpatient reimbursement billing workflows and messages.

14fields
0required
v2.9HL7 version
gp2.py
from zato.hl7v2.v2_9 import GP2
from zato.hl7v2.v2_9 import CWE, CP

gp2 = GP2()
gp2.revenue_code = CWE(
    identifier='0942',
    text='Wellness Program'
)
gp2.number_of_service_units = '1'
gp2.charge = CP(price='75.00')
Python examples

Build GP2 segments in Python

How to construct and work with real-world GP2 segments.

1

Fitness assessment line item

Billing for wellness fitness evaluation

from zato.hl7v2.v2_9 import GP2
from zato.hl7v2.v2_9 import CWE, CP

gp2 = GP2()
gp2.revenue_code = CWE(
    identifier='0942',
    text='Wellness Program'
)
gp2.number_of_service_units = '1'
gp2.charge = CP(price='75.00')
gp2.procedure_code = CWE(
    identifier='S5000',
    text='Fitness Assessment',
    name_of_coding_system='CPT'
)
2

Nutrition consultation line item

Billing for dietary counseling session

from zato.hl7v2.v2_9 import GP2
from zato.hl7v2.v2_9 import CWE, CP

gp2 = GP2()
gp2.revenue_code = CWE(
    identifier='0943',
    text='Nutrition Services'
)
gp2.number_of_service_units = '1'
gp2.charge = CP(price='95.00')
gp2.procedure_code = CWE(
    identifier='97802',
    text='Medical Nutrition Therapy',
    name_of_coding_system='CPT'
)
3

Preventive screening line item

Billing for annual wellness screening

from zato.hl7v2.v2_9 import GP2
from zato.hl7v2.v2_9 import CWE, CP

gp2 = GP2()
gp2.revenue_code = CWE(
    identifier='0770',
    text='Preventive Care'
)
gp2.number_of_service_units = '1'
gp2.charge = CP(price='150.00')
gp2.procedure_code = CWE(
    identifier='99395',
    text='Preventive Visit',
    name_of_coding_system='CPT'
)
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 GP2

GP1 Grouping/reimbursement - visit PRC Pricing FT1 Financial transaction PR1 Procedures
FAQ

Frequently asked questions

GP2 contains grouping and reimbursement information for procedure line items including revenue codes, procedure codes, and charges for wellness service billing.

Use CPT or HCPCS codes in the procedure_code field:

gp2.procedure_code = CWE(
    identifier='97802',
    text='Medical Nutrition Therapy',
    name_of_coding_system='CPT'
)

GP1 contains visit-level grouping information while GP2 contains individual procedure line item details. Multiple GP2 segments can follow a single GP1 for complex wellness visits.

Use modifier_code field for CPT modifiers like 25 (significant separate service) or 59 (distinct procedural service) when billing multiple wellness services.

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

GP2 field reference

Complete list of fields in the GP2 segment, HL7 v2.9.

#Python nameDatatypeUsageRepeatableTable
1▶revenue_codeCWEOptionalNoHL70456
2number_of_service_unitsNMOptionalNo-
3▶chargeCPOptionalNo-
4▶reimbursement_action_codeCWEOptionalNoHL70459
5▶denial_or_rejection_codeCWEOptionalNoHL70460
6▶oce_edit_codeCWEOptionalYesHL70458
7▶ambulatory_payment_classification_codeCWEOptionalNoHL70466
8▶modifier_edit_codeCWEOptionalYesHL70467
9▶payment_adjustment_codeCWEOptionalNoHL70468
10▶packaging_status_codeCWEOptionalNoHL70469
11▶expected_cms_payment_amountCPOptionalNo-
12▶reimbursement_type_codeCWEOptionalNoHL70470
13▶co_pay_amountCPOptionalNo-
14pay_rate_per_service_unitNMOptionalNo-

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