ACOInformation March 2022

10 • American College of Osteopathic Internists

ACOI Info • March 2022


New ICD-10 Clinical Modification (CM) Codes

Jill M. Young, CPC, CEDC, CIMC

Diagnosis codes are traditionally released once a year in the fall with an effective date of January 1 of the following year. The Centers for Disease Control and Prevention’s (CDC) National Center for Health Statistics (NCHS), due to the ongoing national COVID-19 emergency, recently released three new diagnosis codes that you should know. The codes are listed in a new sub-section titled “Under-immunization for COVID-19 Status.” The new codes are effective April 1, 2022. ICD-10-CM Guidelines indicate that when a patient has not received at least one dose of any COVID-19 vaccine, code Z28.310 —Under-immunization for COVID-19 Status, should be assigned.

When a patient has received at least one dose of a multi-dose COVID-19 vaccine regimen but has not received the full set of vaccinations to meet the CDC’s definition of “fully vaccinated” at the time of the encounter, code Z28.311 —Partially vaccinated for COVID-19, should be assigned. The last of the three new codes is Z28.39 —Other under-immunization Status, is for use when the information in the medical record provides detail for which a specific code does not exist. It is the opposite of a code that reads “unspecified.” If you have additional information about the under- immunized status of the patient that is not reflected in a specific code, use the Z28.39 code.

A detailed description of the codes is available here.

These codes are not primary codes and should not be listed first in a patient’s diagnostic list. A note within the new codes additionally indicates that “These codes should not be used for individuals who are not eligible for the COVID-19 vaccines, as determined by the healthcare provider.” O


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