Z23 is the ICD-10 code that identifies an encounter for immunization(s).
Code Z23, which is used to identify encounters for inoculations and vaccinations, indicates that a patient is being seen to receive a prophylactic inoculation against a disease. If the immunization is given during a routine preventive health care examination, Code Z23 would be a secondary code.
CMS will continue to maintain the ICD-9 code website with the posted files. These are the codes providers (physicians, hospitals, etc.) and suppliers must use when submitting claims to Medicare for payment.
The procedure code for prophylactic vaccination and inoculation against viral hepatitis is unknown. Suggest the use of ICD-10 code z23. 9955 or z23. 9959).
The Z23 code includes the following note: “Code first any routine childhood examination.” Therefore, when you provide immunizations in conjunction with a well-child visit, a code for routine child health examination should be reported first, followed by Z23 for any immunizations. This is similar to ICD-9 rules.
ICD-10 requires only one code (Z23) per vaccination, regardless if single or combination. Report Z23 for all vaccination diagnoses.
Therefore, CMS is to eliminating the 90-day grace period for billing discontinued ICD-9- CM diagnosis codes, effective October 1, 2004.
ICD-9 uses mostly numeric codes with only occasional E and V alphanumeric codes. Plus, only three-, four- and five-digit codes are valid. ICD-10 uses entirely alphanumeric codes and has valid codes of up to seven digits.
The Department of Health and Human Services mandated the use of ICD-10-CM beginning in October 2015. The Medicare claims include an indicator for each ICD code to identify if the reported procedure or diagnosis code uses ICD-9 or ICD-10.
CPT CodeCPT CodeCPT DescriptionCPT Code Status90645Haemophilus influenza b vaccine (Hib), HbOC conjugate (4 dose schedule), for intramuscular useActive90646Haemophilus influenza b vaccine (Hib), PRP-D conjugate, for booster use only, intramuscular useActive76 more rows
According to ICD-10-CM guidelines, clinicians may assign code Z28. 310, “Unvaccinated for COVID-19,” when the patient has not received a dose of any COVID-19 vaccine. Clinicians may assign code Z28.
7) along with the appropriate CPT code (90746 for hepatitis B vaccine or 90632 for hepatitis A vaccine) plus the appropriate CPT administration code (90471 for immunization administration).