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ICD-10-CM Code T78.40XA
Allergy, unspecified, initial encounter

Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
| ICD-10 from 2011 - 2016

T78.40XA is a billable ICD code used to specify a diagnosis of allergy, unspecified, initial encounter. A 'billable code' is detailed enough to be used to specify a medical diagnosis.

The ICD code T784 is used to code Idiosyncratic drug reaction

Idiosyncratic drug reactions, also known as type B reactions, are drug reactions that occur rarely and unpredictably amongst the population. This is not to be mistaken with idiopathic, which implies that the cause is not known. They frequently occur with exposure to new drugs, as they have not been fully tested and the full range of possible side-effects have not been discovered; they may also be listed as an adverse drug reaction with a drug, but are extremely rare.

Specialty: Emergency Medicine
MeSH Codes: , D018777, D018777, D001183, D006967
ICD 9 Codes: 995.3, 300, 995.3, 995.21, 995.3
Source: Wikipedia

MS-DRG Mapping

  • DRG Group #915-916 - Allergic reactions with MCC.
  • DRG Group #915-916 - Allergic reactions without MCC.


Allergy, unspecified, not elsewhere classified (approximate match)

This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code T78.40XA and a single ICD9 code, 995.3 is an approximate match for comparison and conversion purposes.

Parent Code: T78.40 - Allergy, unspecified

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/T7840XA