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  6. 2024 ICD-10-CM Code T78.2XXA

2024 ICD-10-CM Diagnosis Code T78.2XXA

Anaphylactic shock, unspecified, initial encounter

ICD-10-CM Code:
T78.2XXA
ICD-10 Code for:
Anaphylactic shock, unspecified, initial encounter
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Injury, poisoning and certain other consequences of external causes
    (S00–T88)
    • Other and unspecified effects of external causes
      (T66-T78)
      • Adverse effects, not elsewhere classified
        (T78)

T78.2XXA is a billable diagnosis code used to specify a medical diagnosis of anaphylactic shock, unspecified, initial encounter. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

T78.2XXA is an initial encounter code, includes a 7th character and should be used while the patient is receiving active treatment for a condition like anaphylactic shock unspecified. According to ICD-10-CM Guidelines an "initial encounter" doesn't necessarily means "initial visit". The 7th character should be used when the patient is undergoing active treatment regardless if new or different providers saw the patient over the course of a treatment. The appropriate 7th character codes should also be used even if the patient delayed seeking treatment for a condition.

Unspecified diagnosis codes like T78.2XXA are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Allergic reaction caused by Hevea brasiliensis latex protein
  • Allergic reaction caused by hymenoptera venom
  • Allergic reaction caused by hymenoptera venom
  • Allergic reaction caused by hymenoptera venom
  • Allergic reaction caused by insect bite and/or insect sting
  • Allergic reaction caused by insect bite and/or insect sting
  • Allergic reaction to bee sting
  • Allergic reaction to wasp sting
  • Anaphylactic shock
  • Anaphylaxis
  • Anaphylaxis caused by insect bite and/or insect sting
  • Anaphylaxis caused by insect bite and/or insect sting
  • Anaphylaxis caused by insect bite and/or insect sting
  • Anaphylaxis caused by insect venom
  • Anaphylaxis caused by insect venom
  • Anaphylaxis caused by insect venom
  • Anaphylaxis caused by low temperature
  • Anaphylaxis caused by venom
  • Anaphylaxis caused by venom
  • Anaphylaxis caused by venom
  • Anaphylaxis caused by venom
  • Anaphylaxis caused by venom
  • Anaphylaxis due to Hevea brasiliensis latex protein
  • Anaphylaxis due to hymenoptera venom
  • Anaphylaxis due to hymenoptera venom
  • Anaphylaxis due to hymenoptera venom
  • Anaphylaxis due to mast cell disorder
  • Bee sting-induced anaphylaxis
  • Drug-induced anaphylaxis
  • Exercise anaphylaxis
  • Exercise anaphylaxis
  • Food-dependent exercise-induced anaphylaxis
  • Iatrogenic non-allergic anaphylaxis
  • Idiopathic anaphylaxis
  • Insulin adverse reaction
  • Insulin-induced anaphylaxis
  • Late effect of accidental injury
  • Late effect of accidental injury
  • Localized anaphylaxis
  • Non-allergic anaphylaxis
  • Non-allergic anaphylaxis caused by organic phosphorous compound
  • Seminal fluid-induced anaphylaxis
  • Wasp sting-induced anaphylaxis

Clinical Classification

Clinical Information

  • Anaphylaxis

    an acute hypersensitivity reaction due to exposure to a previously encountered antigen. the reaction may include rapidly progressing urticaria, respiratory distress, vascular collapse, systemic shock, and death.

  • Exercise-Induced Allergies

    allergic reactions following a period of exercise. elevated serum histamine and tryptase levels and cutaneous mast cell degranulation are often associated with post-exertional allergic reactions which sometimes are triggered only in combination with prior consumption of a specific food such as wheat. allergic symptoms produced post-exercise range from skin eruption, asthma, bronchospasm, and anaphylaxis.

  • Passive Cutaneous Anaphylaxis

    an evanescent cutaneous reaction occurring when antibody is injected into a local area on the skin and antigen is subsequently injected intravenously along with a dye. the dye makes the rapidly occurring capillary dilatation and increased vascular permeability readily visible by leakage into the reaction site. pca is a sensitive reaction for detecting very small quantities of antibodies and is also a method for studying the mechanisms of immediate hypersensitivity.

  • Venom Hypersensitivity

    allergic reaction to venoms in insect bites and stings that is triggered by the immune system (i.e., histamine release).

  • Histamine Release

    the secretion of histamine from mast cell and basophil granules by exocytosis. this can be initiated by a number of factors, all of which involve binding of ige, cross-linked by antigen, to the mast cell or basophil's fc receptors. once released, histamine binds to a number of different target cell receptors and exerts a wide variety of effects.

  • Anaphylactoid/Anaphylaxis|Anaphylactoid / Anaphylaxis

    acute immune response that occurs from exposure to an allergen. it can be anaphylaxis or like anaphylaxis

  • Anaphylaxis

    an acute hypersensitive immune response that occurs from exposure to an allergen. it results from the release of histamine and histamine-like substances from mast cells, and can present with breathing difficulty due to narrowed airways, dizziness and hypotension, skin rash, weak pulse, nausea and vomiting.

  • Anaphylaxis, CTCAE|Anaphylaxis|Anaphylaxis

    a disorder characterized by an acute inflammatory reaction resulting from the release of histamine and histamine-like substances from mast cells, causing a hypersensitivity immune response. clinically, it presents with breathing difficulty, dizziness, hypotension, cyanosis and loss of consciousness and may lead to death.

  • Grade 3 Anaphylaxis, CTCAE|Grade 3 Anaphylaxis

    symptomatic bronchospasm, with or without urticaria; parenteral intervention indicated; allergy-related edema/angioedema; hypotension

  • Grade 4 Anaphylaxis, CTCAE|Grade 4 Anaphylaxis

    life-threatening consequences; urgent intervention indicated

  • Grade 5 Anaphylaxis, CTCAE|Grade 5 Anaphylaxis

    death

Coding Guidelines

The appropriate 7th character is to be added to each code from block Adverse effects, not elsewhere classified (T78). Use the following options for the aplicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Convert T78.2XXA to ICD-9-CM

  • ICD-9-CM Code: 995.0 - Other anaphylactic react
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education


Anaphylaxis

Anaphylaxis is a serious allergic reaction. It can begin very quickly, and symptoms may be life-threatening. The most common causes are reactions to foods (especially peanuts), medications, and stinging insects. Other causes include exercise and exposure to latex. Sometimes no cause can be found.

It can affect many organs:

  • Skin - itching, hives, redness, swelling
  • Nose - sneezing, stuffy nose, runny nose
  • Mouth - itching, swelling of the lips or tongue
  • Throat - itching, tightness, trouble swallowing, swelling of the back of the throat
  • Chest - shortness of breath, coughing, wheezing, chest pain or tightness
  • Heart - weak pulse, passing out, shock
  • Gastrointestinal tract - vomiting, diarrhea, cramps
  • Nervous system - dizziness or fainting

If someone is having a serious allergic reaction, call 911. If an auto-injector is available, give the person the injection right away.


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.