Ignixa.DeId

Ignixa.DeId

FHIR resource de-identification via FHIRPath-based rules. Supports HIPAA Safe Harbor de-identification standards.

Installation

dotnet add package Ignixa.DeId

Quick Start

using Ignixa.DeId;
using Ignixa.Specification;

// Create de-identification engine from configuration
var schema = FhirVersion.R4.GetSchemaProvider();
var engine = new DeIdEngine("config.json", schema);

// De-identify FHIR JSON
var patientJson = """
{
  "resourceType": "Patient",
  "id": "example",
  "name": [{ "family": "Smith", "given": ["John"] }],
  "birthDate": "2000-01-01"
}
""";

var result = await engine.DeidentifyAsync(patientJson);

Configuration Example

{
  "fhirVersion": "R4",
  "fhirPathRules": [
    {
      "path": "Patient.id",
      "method": "cryptoHash"
    },
    {
      "path": "descendants().ofType(HumanName)",
      "method": "redact"
    },
    {
      "path": "descendants().ofType(date)",
      "method": "dateShift"
    }
  ],
  "parameters": {
    "dateShiftKey": "your-secret-key",
    "cryptoHashKey": "your-hash-key",
    "enablePartialDatesForRedact": true,
    "enablePartialAgesForRedact": true,
    "enablePartialZipCodesForRedact": true
  }
}

De-identification Methods

HIPAA Safe Harbor Support

Partial redaction features for HIPAA compliance:

• Dates: Preserve year only (if age <=89)
• Ages: Truncate ages >89 to "90+"
• Zip Codes: Keep first 3 digits (except restricted areas)

Batch Processing

using Ignixa.Serialization.SourceNodes;

async IAsyncEnumerable<ResourceJsonNode> LoadResourcesAsync()
{
    foreach (var line in File.ReadLines("patients.ndjson"))
    {
        yield return ResourceJsonNode.Parse(line);
    }
}

var resources = LoadResourcesAsync();

await foreach (var result in engine.DeidentifyManyAsync(resources))
{
    if (result.IsSuccess)
    {
        await File.AppendAllTextAsync("de-identified.ndjson", result.Value.DeidentifiedJson + "\n");
    }
    else
    {
        Console.Error.WriteLine($"Failed: {result.Error.Message}");
    }
}

Documentation

Full documentation: https://brendankowitz.github.io/ignixa-fhir/docs/core-sdk/deid

Attribution

This library is based on the FHIR Tools for Anonymization by Microsoft, adapted for the Ignixa ecosystem.

License

MIT License. See LICENSE file in the repository root.