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Every code uses real reference datasets — ICD-10, LOINC, NDC, SNOMED CT, CVX, RxNorm, HCPCS — so generated messages pass downstream validation the same way production data would.

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Supported Standards

HL7 v2 and FHIR R4 generation are free. NCPDP SCRIPT generation is closed by default: it requires confirming NCPDP membership and installing the licensed standards package (pidgeon data install ncpdp-script --accept-license). Until then the CLI and apps report NCPDP as license-required rather than emitting a message.

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HL7 v2 Coverage

Post’s HL7 v2 parsing and generation is structurally broad, but the number that matters is what’s proven end-to-end: generate → validate → round-trip against the published spec. That verified set is 279 HL7 message-type × version combinations — 38 message types, each across some or all of HL7 v2.3 through v2.8 — from the engine’s own runtime capability matrix, not a hand-maintained table:
ADT^A01 Admission, ADT^A02 Transfer, ADT^A03 Discharge, ADT^A04 Registration, ADT^A05 Pre-admit, ADT^A08 Update patient info, ADT^A11 Cancel admit, ADT^A12 Cancel transfer, ADT^A13 Cancel discharge
ORM^O01 General order, ORU^R01 Observation result, OML^O21 Lab order (multi-order), RSP^K11/K21/K22 Query responses, QBP^Q11/Q21/Q22 Query by parameter
RDE^O11 Pharmacy/treatment encoded order, RDE^O25 Pharmacy/treatment refill authorization, RGV^O15 Pharmacy/treatment give, RAS^O17 Pharmacy/treatment administration
SIU^S12 New appointment, SIU^S13 Request rescheduling, SIU^S14 Modification notification, SIU^S15 Cancellation notification, SIU^S17 Deletion notification
MDM^T02 Original with content, MDM^T04/T06/T08/T10 document addenda, status changes, and replacements
BAR^P01 Add patient account, BAR^P02 Purge patient account, BAR^P05 Update account, DFT^P03 Post detail financial transaction
VXU^V04 Unsolicited vaccination update
ACK general acknowledgment
Shell-safe syntax is supported: ADT-A01, ADT_A01, and ADT.A01 all work as alternatives to ADT^A01.
This list is the current spec-validated set, not a ceiling — Post’s parser handles a broader range of HL7 v2 structurally. Run pidgeon capabilities for the live matrix rather than trusting this page to stay current.

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FHIR R4 Resources

24 resource types at spec-validated level, spanning clinical, administrative, and financial domains:
Patient, RelatedPerson
Observation, DiagnosticReport, Condition, AllergyIntolerance, Immunization
Medication, MedicationRequest, MedicationAdministration, MedicationDispense, Procedure, ServiceRequest
Encounter, CareTeam, CarePlan
Organization, Location, Practitioner, PractitionerRole
Bundle, DocumentReference
Coverage, Claim

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NCPDP SCRIPT 2017071

NCPDP SCRIPT generation is closed by default and license-gated. NCPDP’s SCRIPT XSDs are member-only, so the standards material is not shipped: confirm your NCPDP membership, then run pidgeon data install ncpdp-script --accept-license to enable generation. Until the package is installed, NCPDP is reported as license-required.
Once enabled, the SCRIPT transaction set spans the prescription workflow with XML serialization and structural validation:
NewRx, RxChangeRequest, RxChangeResponse, RefillRequest, RefillResponse, CancelRx, CancelRxResponse
RxFill, RxHistoryRequest, RxHistoryResponse, ResupplyRequest, ResupplyResponse
PriorAuth, PriorAuthResponse, Predetermination, Eligibility, BenefitsCoordination
Formulary, DUR, DrugAlert, Interaction, Allergy, ClinicalInfo, Verify, Status, Error, Acknowledgment, and more
Run pidgeon --output-format json capabilities --standard ncpdp for the exact enabled set on your machine — it reports the license-required state until the ncpdp-script package is installed.

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Generation Modes

Deterministic generation using reference datasets (ICD-10, LOINC, NDC, SNOMED). Fast and reproducible. Available to all users.
Uses a local AI model for enhanced clinical narratives and realistic note text.
Cloud AI provider for highest quality clinical narratives. Requires BYOK configuration.

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Reproducibility

Use --seed for deterministic output. The same seed always produces the same message, making tests repeatable across machines and CI runs:

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Vendor-Specific Generation

See Vendor Profiles for creating and managing vendor configurations.

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Output Options