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T78.49XABillableSave

T78.49XA - Other allergy, initial encounter

ICD-10-CM Chapter 19: Injury, poisoning and certain other consequences of external causes · T66-T78 Other and unspecified effects of external causes (T66-T78) · Subcategory of T78.49 · FY2027

7th character A: initial encounter

Coding Guidance

7th character A: initial encounter.

Includes, Excludes and Coding Notes

Excludes 1 — Not Coded HereFrom T78.4

Mutually exclusive: these conditions are never reported together with 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)
Excludes 2 — Not Included HereFrom T78

Not part of this code; report both codes when the patient has both conditions.

  • complications of surgical and medical care NEC (T80-T88)
Code AlsoFrom T66-T78 Other and unspecified effects of external causes (T66-T78)

Report an additional code when both conditions apply.

  • , if applicable, place of occurrence, such as:
  • highway rest stop (Y92.523)
  • school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
  • service areas as the place of occurrence of the external cause (Y92.52-)
  • single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
  • transport vehicle as the place of occurrence of the external cause (Y92.81-)
Excludes 2 — Not Included HereFrom Chapter S00-T88

Not part of this code; report both codes when the patient has both conditions.

  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)
Use Additional CodeFrom Chapter S00-T88

Add a secondary code to identify the associated condition or cause when it is documented.

  • code to identify any retained foreign body, if applicable (Z18.-)
NotesFrom Chapter S00-T88

Instructional notes from the ICD-10-CM tabular list.

  • 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
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with T78.49XA.