AL1 segment
The AL1 segment contains patient allergy information of various types. Most of this information will be derived from user-defined tables. Each AL1 segment describes a single patient allergy.
The shape of one line
segmentAL1|AL1-1Set ID - AL1|AL1-2Allergen Type Code|AL1-3Allergen Code/Mnemonic/D…|AL1-4Allergy Severity Code|AL1-5Allergy Reaction Code|AL1-6Identification Date
required optional kept for older systems, still counted
AL1-3 and its value arrives as AL1-2, so the receiver stores Allergen Code/Mnemonic/Description as Allergen Type Code.This page carries the AL1 field table as published and nothing beyond it. The field notes, vendor behaviour, FHIR mapping and parsing guidance that thePID page has are still to be written for AL1.
Every field
| SEQ | LEN | DT | OPT | RP/# | TBL# | ITEM# | Element name | Cardinality |
|---|---|---|---|---|---|---|---|---|
| AL1-1 | 4 | SI | R | 00203 | Set ID - AL1 | 1..1 | ||
| 250 | CE | O | 0127 | 00204 | Allergen Type Code | 0..1 | ||
| ||||||||
| 250 | CE | R | 00205 | Allergen Code/Mnemonic/Description | 1..1 | |||
| ||||||||
| 250 | CE | O | 0128 | 00206 | Allergy Severity Code | 0..1 | ||
| ||||||||
| AL1-5 | 15 | ST | O | Y | 00207 | Allergy Reaction Code | 0..* | |
| AL1-6 | 8 | DT | B | 00208 | Identification Date deprecated | 0..1 | ||
Related
Message types carrying AL1
AL1 appears in 33 message structures, belonging to 23 message types.