T78Not billable, use a more specific code below
Adverse effects, not elsewhere classified
In Other and unspecified effects of external causes (T66-T78), chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes
81 billable codes under T78: 15 are a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.
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Instructional notes
Excludes2: not included here, code separately if applicable
- complications of surgical and medical care NEC (T80-T88)
Also applies, from Other and unspecified effects of external causes (T66-T78)
These notes sit on T66-T78 and apply to every code under it, including T78.
Code also: add a code for this too, order depends on the encounter
- 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-)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers 7th character use and coding of injuries, fractures, burns, drug and toxic effects, abuse and neglect, and complications of care (S00-T88).
- Application of 7th Characters in Chapter 19 (page 77)
- Coding of Injuries (page 78)
- Coding of Traumatic Fractures (page 79)
- Coding of Burns and Corrosions (page 80)
- Adverse Effects, Poisoning, Underdosing and Toxic Effects (page 82)
- Adult and child abuse, neglect and other maltreatment (page 85)
- Complications of care (page 85)
All codes under T78
T78 can't be used on a claim. Pick a billable code below; grey headings group them.
- T78.0Anaphylactic reaction due to food
- T78.00Anaphylactic reaction due to unspecified food
- T78.00XAAnaphylactic reaction due to unspecified food, initial encounter
- T78.00XDAnaphylactic reaction due to unspecified food, subsequent encounter
- T78.00XSAnaphylactic reaction due to unspecified food, sequela
- T78.01Anaphylactic reaction due to peanuts
- T78.01XAAnaphylactic reaction due to peanuts, initial encounter
- T78.01XDAnaphylactic reaction due to peanuts, subsequent encounter
- T78.01XSAnaphylactic reaction due to peanuts, sequela
- T78.02Anaphylactic reaction due to shellfish (crustaceans)
- T78.02XAAnaphylactic reaction due to shellfish (crustaceans), initial encounter
- T78.02XDAnaphylactic reaction due to shellfish (crustaceans), subsequent encounter
- T78.02XSAnaphylactic reaction due to shellfish (crustaceans), sequela
- T78.03Anaphylactic reaction due to other fish
- T78.03XAAnaphylactic reaction due to other fish, initial encounter
- T78.03XDAnaphylactic reaction due to other fish, subsequent encounter
- T78.03XSAnaphylactic reaction due to other fish, sequela
- T78.04Anaphylactic reaction due to fruits and vegetables
- T78.04XAAnaphylactic reaction due to fruits and vegetables, initial encounter
- T78.04XDAnaphylactic reaction due to fruits and vegetables, subsequent encounter
- T78.04XSAnaphylactic reaction due to fruits and vegetables, sequela
- T78.05Anaphylactic reaction due to tree nuts and seeds
- T78.05XAAnaphylactic reaction due to tree nuts and seeds, initial encounter
- T78.05XDAnaphylactic reaction due to tree nuts and seeds, subsequent encounter
- T78.05XSAnaphylactic reaction due to tree nuts and seeds, sequela
- T78.06Anaphylactic reaction due to food additives
- T78.06XAAnaphylactic reaction due to food additives, initial encounter
- T78.06XDAnaphylactic reaction due to food additives, subsequent encounter
- T78.06XSAnaphylactic reaction due to food additives, sequela
- T78.07Anaphylactic reaction due to milk and dairy products
- T78.070Anaphylactic reaction due to milk and dairy products with tolerance to baked milk
- T78.070AAnaphylactic reaction due to milk and dairy products with tolerance to baked milk, initial encounter
- T78.070DAnaphylactic reaction due to milk and dairy products with tolerance to baked milk, subsequent encounter
- T78.070SAnaphylactic reaction due to milk and dairy products with tolerance to baked milk, sequela
- T78.071Anaphylactic reaction due to milk and dairy products with reactivity to baked milk
- T78.071AAnaphylactic reaction due to milk and dairy products with reactivity to baked milk, initial encounter
- T78.071DAnaphylactic reaction due to milk and dairy products with reactivity to baked milk, subsequent encounter
- T78.071SAnaphylactic reaction due to milk and dairy products with reactivity to baked milk, sequela
- T78.079Anaphylactic reaction due to milk and dairy products, unspecified
- T78.079AAnaphylactic reaction due to milk and dairy products, unspecified, initial encounter
- T78.079DAnaphylactic reaction due to milk and dairy products, unspecified, subsequent encounter
- T78.079SAnaphylactic reaction due to milk and dairy products, unspecified, sequela
- T78.08Anaphylactic reaction due to eggs
- T78.080Anaphylactic reaction due to egg with tolerance to baked egg
- T78.080AAnaphylactic reaction due to egg with tolerance to baked egg, initial encounter
- T78.080DAnaphylactic reaction due to egg with tolerance to baked egg, subsequent encounter
- T78.080SAnaphylactic reaction due to egg with tolerance to baked egg, sequela
- T78.081Anaphylactic reaction due to egg with reactivity to baked egg
- T78.081AAnaphylactic reaction due to egg with reactivity to baked egg, initial encounter
- T78.081DAnaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter
- T78.081SAnaphylactic reaction due to egg with reactivity to baked egg, sequela
- T78.089Anaphylactic reaction due to eggs, unspecified
- T78.089AAnaphylactic reaction due to eggs, unspecified, initial encounter
- T78.089DAnaphylactic reaction due to eggs, unspecified, subsequent encounter
- T78.089SAnaphylactic reaction due to eggs, unspecified, sequela
- T78.09Anaphylactic reaction due to other food products
- T78.09XAAnaphylactic reaction due to other food products, initial encounter
- T78.09XDAnaphylactic reaction due to other food products, subsequent encounter
- T78.09XSAnaphylactic reaction due to other food products, sequela
- T78.1Other adverse food reactions, not elsewhere classified
- T78.11Other adverse food reactions due to milk and dairy products
- T78.110Other adverse food reactions due to milk and dairy products with tolerance to baked milk
- T78.110AOther adverse food reactions due to milk and dairy products with tolerance to baked milk, initial encounter
- T78.110DOther adverse food reactions due to milk and dairy products with tolerance to baked milk, subsequent encounter
- T78.110SOther adverse food reactions due to milk and dairy products with tolerance to baked milk, sequela
- T78.111Other adverse food reaction due to milk and dairy products with reactivity to baked milk
- T78.111AOther adverse food reaction due to milk and dairy products with reactivity to baked milk, initial encounter
- T78.111DOther adverse food reaction due to milk and dairy products with reactivity to baked milk, subsequent encounter
- T78.111SOther adverse food reaction due to milk and dairy products with reactivity to baked milk, sequela
- T78.119Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified
- T78.119AOther adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, initial encounter
- T78.119DOther adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, subsequent encounter
- T78.119SOther adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, sequela
- T78.12Other adverse food reaction due to eggs
- T78.120Other adverse food reaction due to egg with tolerance to baked egg
- T78.120AOther adverse food reaction due to egg with tolerance to baked egg, initial encounter
- T78.120DOther adverse food reaction due to egg with tolerance to baked egg, subsequent encounter
- T78.120SOther adverse food reaction due to egg with tolerance to baked egg, sequela
- T78.121Other adverse food reaction due to egg with reactivity to baked egg
- T78.121AOther adverse food reaction due to egg with reactivity to baked egg, initial encounter
- T78.121DOther adverse food reaction due to egg with reactivity to baked egg, subsequent encounter
- T78.121SOther adverse food reaction due to egg with reactivity to baked egg, sequela
- T78.129Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified
- T78.129AOther adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, initial encounter
- T78.129DOther adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, subsequent encounter
- T78.129SOther adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, sequela
- T78.19Other adverse food reactions, not elsewhere classified
- T78.19XAOther adverse food reactions, not elsewhere classified, initial encounter
- T78.19XDOther adverse food reactions, not elsewhere classified, subsequent encounter
- T78.19XSOther adverse food reactions, not elsewhere classified, sequela
- T78.2Anaphylactic shock, unspecified
- T78.2XXAAnaphylactic shock, unspecified, initial encounter
- T78.2XXDAnaphylactic shock, unspecified, subsequent encounter
- T78.2XXSAnaphylactic shock, unspecified, sequela
- T78.3Angioneurotic edema
- T78.3XXAAngioneurotic edema, initial encounter
- T78.3XXDAngioneurotic edema, subsequent encounter
- T78.3XXSAngioneurotic edema, sequela
- T78.4Other and unspecified allergy
- T78.40Allergy, unspecified
- T78.40XAAllergy, unspecified, initial encounter
- T78.40XDAllergy, unspecified, subsequent encounter
- T78.40XSAllergy, unspecified, sequela
- T78.41Arthus phenomenon
- T78.41XAArthus phenomenon, initial encounter
- T78.41XDArthus phenomenon, subsequent encounter
- T78.41XSArthus phenomenon, sequela
- T78.49Other allergy
- T78.49XAOther allergy, initial encounter
- T78.49XDOther allergy, subsequent encounter
- T78.49XSOther allergy, sequela
- T78.8Other adverse effects, not elsewhere classified
- T78.8XXAOther adverse effects, not elsewhere classified, initial encounter
- T78.8XXDOther adverse effects, not elsewhere classified, subsequent encounter
- T78.8XXSOther adverse effects, not elsewhere classified, sequela
T78 MS-DRGs
As the principal diagnosis, the billable codes under T78 group to these 10 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 922 Other Injury, Poisoning and Toxic Effect Diagnoses with MCC (35 of 81 codes)
- DRG 923 Other Injury, Poisoning and Toxic Effect Diagnoses without MCC (35 of 81 codes)
- DRG 949 Aftercare with CC/MCC (27 of 81 codes)
- DRG 950 Aftercare without CC/MCC (27 of 81 codes)
- DRG 915 Allergic Reactions with MCC (18 of 81 codes)
- DRG 916 Allergic Reactions without MCC (18 of 81 codes)
- DRG 791 Prematurity with Major Problems (1 of 81 codes)
- DRG 793 Full Term Neonate with Major Problems (1 of 81 codes)
- DRG 917 Poisoning and Toxic Effects of Drugs with MCC (1 of 81 codes)
- DRG 918 Poisoning and Toxic Effects of Drugs without MCC (1 of 81 codes)
Other codes that refer to T78
Notes on these codes point to T78.
- T75 Excludes1: adverse effects NEC (T78.-)
Code history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.