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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#	DataElement	Description	Must Implement	Flags	Cardinality	Length	C.LEN	Vocabulary	DataType
AL1
1	00203	Set ID - AL1	SHALL		[1..1]	[1..4]			SI
2	00204	Allergen Type Code			[0..1]			0127 Allergen Type	CWE
3	00205	Allergen Code/Mnemonic/Description			[0..1]				CWE
4	00206	Allergy Severity Code			[0..1]			0128 Allergy Severity	CWE
5	00207	Allergy Reaction Code		=	[0..*]		15		ST
6	00208	Identification Date	SHALL NOT	W	[0..0]

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.

(Definition from AL1.2 in Ch. 3)

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.

(Definition from IAM.2 in Ch. 3)

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.

(Definition from AL1.3 in Ch. 3)

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.

(Definition from IAM.3 in Ch. 3)

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.

If a system maintains allergen codes as its unique identifier for a particular allergy, and two systems have agreed to process the IAM using update mode, then this field can be used as the unique identifier instead of IAM-8 - Allergy Unique Identifier. This does not preclude using allergen codes for unique identifiers for snapshot processing.

(Definition from AL1.4 in Ch. 3)

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.

(Definition from IAM.4 in Ch. 3)

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

(Definition from AL1.5 in Ch. 3)

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.).

(Definition from IAM.5 in Ch. 3)

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.).

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..