2026 ICD-10-CM Diagnosis Code T50.B93APoisoning by other viral vaccines, assault, initial encounter
T50.B93A is a billable ICD-10-CM diagnosis code for poisoning by other viral vaccines, assault, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 917 through 918. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under External cause codes: intent of injury, assault; External cause codes: poisoning by drug; and Poisoning by drugs, initial encounter.
Code Identity
Code Classification
Coding GuidelinesGuidance
When coding a poisoning or reaction to the improper use of a medication (e.g., overdose, wrong substance given or taken in error, wrong route of administration), first assign the appropriate code from categories T36-T50. The poisoning codes have an associated intent as their 5th or 6th character (accidental, intentional self-harm, assault and undetermined). If the intent of the poisoning is unknown or unspecified, code the intent as accidental intent. The undetermined intent is only for use if the documentation in the record specifies that the intent cannot be determined. Use additional code(s) for all manifestations of poisonings.
The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Rubella Vaccine
a live attenuated virus vaccine of duck embryo or human diploid cell tissue culture origin, used for routine immunization of children and for immunization of nonpregnant adolescent and adult females of childbearing age who are unimmunized and do not have serum antibodies to rubella. children are usually immunized with measles-mumps-rubella combination vaccine. (dorland, 28th ed)
Table of Drugs and ChemicalsClinical
Substances in the Table of Drugs and Chemicals that reference this code family. Always confirm in the Tabular List before coding.
| Substance | Accidental | Self-harm | Assault | Undetermined | Adverse Effect | Underdosing |
|---|---|---|---|---|---|---|
| Diplovax | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Influenza vaccine | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Measles virus vaccine (attenuated) | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Meruvax | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Mumpsvax | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Orimune | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Poliomyelitis vaccine | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Rubella vaccine | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Rubeola vaccine | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Synagis | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Viral vaccine NEC | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Yellow | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Yellow::fever vaccine | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Yellow::jasmine | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
| Yellow::phenolphthalein | T50.B91 | T50.B92 | T50.B93 | T50.B94 | T50.B95 | T50.B96 |
Patient EducationClinical
Poisoning
A poison is any substance that is harmful to your body. You might swallow it, inhale it, inject it, or absorb it through your skin. Any substance can be poisonous if too much is taken. Poisons can include:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T50.B93A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T50.B93AOverview
Is T50.B93A (Poisoning by other viral vaccines, assault) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report poisoning by other viral vaccines, assault, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T50.B93A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for poisoning by other viral vaccines, assault, such as an emergency visit or first evaluation.
What MS-DRG does T50.B93A group to?
When poisoning by other viral vaccines, assault, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 917, 918, with relative weights from 0.8571 to 1.5684 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of T50.B93A?
Under the General Equivalence Mappings, poisoning by other viral vaccines, assault, initial encounter converts to ICD-9-CM 979.6 (pois-viral/rick vacc NEC) and E962.0 (assault-pois w medic agt). The mapping is approximate, so confirm the match fits the documentation.
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.
