AL1 - Patient Allergy Information 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.

HL7 Attribute Table - AL1 - Patient Allergy Information Segment

Seq#	Data Element Name	DataType	Usage	Vocabulary	Cardinality	Item #	Length	C.LEN	Flags
AL1
1	Set ID - AL1	SI	R		[1..1]	00203	[1..4]
2	Allergen Type Code	CWE	O	0127 Allergen Type	[0..1]	00204
3	Allergen Code/Mnemonic/Description	CWE	O		[0..1]	00205
4	Allergy Severity Code	CWE	O	0128 Allergy Severity	[0..1]	00206
5	Allergy Reaction Code	ST	O		[0..*]	00207		15	#
6	Identification Date		W		[0..1]	00208

AL1-1: Set ID - AL1 (SI) 00203

Definition: This field contains the number that identifies this transaction. For the first occurrence of the segment, the sequence number shall be one, for the second occurrence, the sequence number shall be two, etc.

AL1-2: Allergen Type Code (CWE) 00204

Definition: This field indicates a general allergy category (drug, food, pollen, etc.). Refer to User-defined Table 0127 - Allergen Type in Chapter 2C, Code Tables, for suggested values.

AL1-3: Allergen Code/Mnemonic/Description (CWE) 00205

Definition: This field uniquely identifies a particular allergen. This element may conform to some external, standard coding system (that must be identified), or it may conform to local, largely textual or mnemonic descriptions.

AL1-4: Allergy Severity Code (CWE) 00206

Definition: This field indicates the general severity of the allergy. Refer to User-defined Table 0128 - Allergy Severity in Chapter 2C, Code Tables, for valid values.

AL1-5: Allergy Reaction Code (ST) 00207

Definition: This field identifies the specific allergic reaction that was documented. This element may conform to some external, standard coding system, or it may conform to local, largely textual or mnemonic descriptions (e.g., convulsions, sneeze, rash, etc.).

AL1-6: Identification Date () 00208

Definition: The Al-6 field was retained for backward compatibility only as of v 2.4 and has been withdrawn as of v 2.7. The reader is referred to the IAM-11 – Onset Date or IAM-13 – Inset Date fields for dates when the allergy was identified..