Anesthesia Coding Alert

Reader Questions:

Incorporate These Codes to Track COVID-19 Vaccine Status

Question: Some of our patients are fully vaccinated against COVID-19, some are unvaccinated, and others are somewhere in between. Is there a way to officially document someone’s vaccination status?

Maryland Subscriber

Answer: Yes, you can document a patient’s COVID-19 vaccination status with new ICD-10 code options that went into effect April 1, 2022.

The offerings include the subcategory code Z28.31- (Underimmunization for COVID-19 status) and three additional diagnosis options:

  • Z28.310 (Unvaccinated for COVID-19)
  • Z28.311 (Partially vaccinated for COVID-19)
  • Z29.39 (Other underimmunization status)

Note: The Centers for Disease Control and Prevention (CDC) adds a note to the codes in Chapter 21 of the ICD-10-CM tabular list and addendum: “These codes should not be used for individuals who are not eligible for the COVID-19 vaccines, as determined by the healthcare provider.” Find more details at https://ftp.cdc.gov/pub/Health_Statistics/NCHS/Publications/ICD10CM/2022/icd10cm-tabular-addenda-2022-April-1.pdf.

Additionally, the ICD-10 guidelines also offer more clarity. “Underimmunization for COVID-19 Status Code Z28.310, Unvaccinated for COVID-19, may be assigned when the patient has not received at least one dose of any COVID-19 vaccine. Code Z28.311, Partially vaccinated for COVID-19, may be assigned when the patient has received at least one dose of a multi-dose COVID-19 vaccine regimen, but has not received the full set of doses necessary to meet the Centers for Disease Control and Prevention (CDC) definition of ‘fully vaccinated’ in place at the time of the encounter.”


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