{
  "resourceType": "ValueSet",
  "status": "draft",
  "name": "AllHcAignVS",
  "id": "all-hc-aign",
  "title": "DPD active-ingredient group number (AIGN) -- all codes",
  "description": "The Health Canada Drug Product Database active-ingredient group NUMBER (AIGN) -- a ten-digit\nnumber that gathers the drug products sharing an active-ingredient composition and strength across\nmanufacturer and salt form.\n\n**The number has parts, and the parts are the useful thing to know about it.** It decomposes as:\n\n- the first **2 digits** -- how many active ingredients the product has;\n- the next **5 digits** -- WHICH active-ingredient group it is (this portion is itself a code, and\n  it has its own system: see the AIGC set);\n- the last **3 digits** -- which STRENGTH group, with a tolerance of -2% to +10%.\n\nSo the full ten-digit number names a drug **at a strength**. That is what a prescription, a dispense\nand a medication statement mean, which is why the three medication profiles pin this system on their\n`aign` slice. An allergy does not mean a strength, and `AllergyIntolerance` pins the five-digit\nportion instead.\n\n**Matching a medication to an allergen therefore means taking positions 3 through 7 of this number\nand comparing them to the allergen's five-digit code.** The two are different systems and different\nlengths; comparing them as equal strings never matches, and it fails silently.\n\nWhy it matters at all: the group number covers the whole DIN space and is reachable from a DIN, so\nit is the ingredient-level key available for legacy medication lists where a DIN and a line of free\ntext is all that exists and no CCDD code was ever recorded.\n\nPublished by **Health Canada** through the Drug Product Database; the code system identity is\npublished by **HL7 Canada** through HL7 Terminology (THO). Obtain the numbers from the Drug Product\nDatabase: <https://health-products.canada.ca/dpd-bdpp/>, with terminology notes at\n<https://www.canada.ca/en/health-canada/services/drugs-health-products/drug-products/drug-product-database/terminology.html>.\nNothing here is licence-encumbered.\n\nThe canonical URI is `http://terminology.hl7.org/CodeSystem/v3-hc-aign`; the corresponding OID is\n`2.16.840.1.113883.5.1106`.\n\n**The set enumerates no codes of its own.** It includes the whole system, so it means every code in it, and it exists so the system URI resolves to a definition rather than to nothing. The definition itself stays with the publisher at the canonical above: this specification does not redefine the system and does not restrict it. Where this page shows a list of codes, that list is a SAMPLE reproduced under the publisher's own terms and is not the set's content -- the page says how many of how many it is showing.",
  "url": "https://fhir.apps.health/ValueSet/all-hc-aign",
  "experimental": false,
  "date": "2026-08-22",
  "publisher": "WELLSTAR Technologies Corp.",
  "copyright": "The active-ingredient group number is published by Health Canada through the Drug Product Database, under the Open Government Licence -- Canada 2.0. The code system identity is published by HL7 Canada through HL7 Terminology (THO), which is made available under CC0. Contains information licensed under the Open Government Licence -- Canada, obtained from Health Canada's Drug Product Database. This does not imply endorsement by Health Canada. The set itself enumerates no codes; the sample of codes shown on this specification's rendered page is reproduced on that basis.",
  "compose": {
    "include": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/v3-hc-aign"
      }
    ]
  }
}