Interface: BuildCcdaAllergy

An Allergy Concern for the Allergies section. Either an allergen (RxNorm at ingredient level by default, or UNII / SNOMED CT) or noKnownAllergy: true (the negationInd "No Known Allergies" assertion) is required, the two are never conflated. reaction, severity, and criticality are optional; severity (of a reaction) and criticality (of the propensity) are distinct axes.

Example

import type { BuildCcdaAllergy } from "@cosyte/ccda";
const penicillin: BuildCcdaAllergy = {
  allergen: { code: "7980", displayName: "Penicillin G" },
  reaction: { code: "247472004", displayName: "Hives" },
  criticality: { code: "CRITH", displayName: "High criticality" },
};
const nka: BuildCcdaAllergy = { noKnownAllergy: true };

Properties

allergen?

readonly optional allergen?: BuildCode

The offending substance (RxNorm ingredient default, or UNII / SNOMED CT).

---

criticality?

readonly optional criticality?: BuildCode

The propensity criticality (HL7 ObservationValue by default), optional.

---

noKnownAllergy?

readonly optional noKnownAllergy?: boolean

Assert "No Known Allergies" (negationInd="true"), mutually exclusive with allergen.

---

onset?

readonly optional onset?: string

Onset date as an HL7 date string, the Allergy Concern Act effectiveTime/low (when the allergy became a tracked concern), optional. When omitted the SHALL low is emitted as nullFlavor="UNK", never a fabricated date.

---

reaction?

readonly optional reaction?: BuildCode

The reaction manifestation (SNOMED CT by default), optional.

---

resolution?

readonly optional resolution?: string

Resolution date as an HL7 date string, the concern effectiveTime/high (when the concern was completed). Requires status: "resolved", exactly as a BuildCcdaProblem resolution does; buildCcda rejects a resolution date on a non-resolved allergy. A resolved allergy whose date is unknown still emits a nullFlavor="UNK" high.

---

severity?

readonly optional severity?: BuildCode

The reaction's severity (SNOMED CT by default), optional.

---

status?

readonly optional status?: "active" | "resolved" | "inactive"

Active / resolved / inactive; defaults to "active".

---

type?

readonly optional type?: BuildCode

The propensity type, the Allergy-Intolerance Observation value (SNOMED CT by default), from the C-CDA Allergy/Intolerance Type value set: e.g. drug allergy 416098002, food allergy 414285001, environmental 426232007. Defaults to the neutral 419199007 "Allergy to substance", the builder does not guess "Drug allergy" for a non-drug allergen.