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ICD-10 T78.4 - Other and unspecified allergy
Chapter 19 Section T66-T78

T78.4

ICD-10 Not billable

Other and unspecified allergy

Use additional code: code to identify any retained foreign body, if applicable (Z18.-) (per Chapter 19)
Specifically for this code:
  • 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)
From Chapter 19:
  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)
From Chapter 19:
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
T78.4 is a "category code," which means it's non-billable. Billable codes require more specificity. Use the list below to navigate to codes that are more specific:
10
T78.40
Allergy, unspecified
Billable
10
T78.40XA
Allergy, unspecified, initial encounter
Billable
10
T78.40XD
Allergy, unspecified, subsequent encounter
Billable
10
T78.40XS
Allergy, unspecified, sequela
Billable
10
T78.41
Arthus phenomenon
Billable
10
T78.41XA
Arthus phenomenon, initial encounter
Billable
10
T78.41XD
Arthus phenomenon, subsequent encounter
Billable
10
T78.41XS
Arthus phenomenon, sequela
Billable
10
T78.49
Other allergy
Billable
10
T78.49XA
Other allergy, initial encounter
Billable
10
T78.49XD
Other allergy, subsequent encounter
Billable
10
T78.49XS
Other allergy, sequela
Billable
      
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