T78.40XA
Billable

Allergy, unspecified (initial encounter)

Chapter 19: Injury, poisoning and certain other consequences of external causes

Inclusion Terms

2 items

•
Allergic reaction NOS
•
Hypersensitivity NOS

Billable Code

T78.40XA is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

Referenced in Diagnoses

Conditions that use this ICD-10 code in their documentation

allergic reaction unspecified

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Allergic Reaction, Unspecified

allergies unspecified

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Allergy, unspecified

allergy

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Allergic Disorder

allergy rash

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Allergic Contact Dermatitis

allergy testing

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Encounter for Allergy Testing

allergy unspecified

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Unspecified Allergy

elevated histamines

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Histamine Intolerance

mosquito allergy

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Allergic Reaction to Mosquito Bites

uvula swelling

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Uvulitis

Additional Information from Parent Codes

The following information may apply to this code from its parent codes in the ICD-10 hierarchy. This information is important for proper coding and classification.

Parent Codes Referenced:

S00-T88(Chapter 19)T78(Adverse effects, not elsewhere classified)T78.4(Other and unspecified allergy)T78.40(Allergy, unspecified)

Inclusion Terms

2 items

From T78.40:

•
Allergic reaction NOS
•
Hypersensitivity NOS

Excludes1

9 items

From S00-T88:

•
birth trauma (P10-P15)
•
obstetric trauma (O70-O71)

From T78.4:

•
specified types of allergic reaction such as:
•
allergic diarrhea (K52.29)
•
allergic gastroenteritis and colitis (K52.29)
•
dermatitis (L23-L25, L27.-)
•
food protein-induced enterocolitis syndrome (K52.21)
•
food protein-induced enteropathy (K52.22)
•
hay fever (J30.1)

Excludes2

1 item

From T78:

•
complications of surgical and medical care NEC (T80-T88)

Use Additional Code

1 item

From S00-T88:

•
code to identify any retained foreign body, if applicable (Z18.-)

7th Character Notes

4 items

From T78:

•
The appropriate 7th character is to be added to each code from category T78
•
A: initial encounter
•
D: subsequent encounter
•
S: sequela

T78.40XA
Billable

Allergy, unspecified (initial encounter)

Inclusion Terms

Billable Code

Referenced in Diagnoses

Additional Information from Parent Codes

Parent Codes Referenced:

Inclusion Terms

From T78.40:

Excludes1

From S00-T88:

From T78.4:

Excludes2

From T78:

Use Additional Code

From S00-T88:

7th Character Notes

From T78:

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T78.40XABillable

Allergy, unspecified (initial encounter)

Inclusion Terms

Billable Code

Referenced in Diagnoses

Additional Information from Parent Codes

Parent Codes Referenced:

Inclusion Terms

From T78.40:

Excludes1

From S00-T88:

From T78.4:

Excludes2

From T78:

Use Additional Code

From S00-T88:

7th Character Notes

From T78:

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Built by Freed

Helpful Links

T78.40XA
Billable

We build tools for
clinician happiness.