Z23 Encounter for immunization

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Code first

• any routine childhood examination

Code also

• , if applicable, encounter for immunization safety counseling (Z71.85)

Notes

• procedure codes are required to identify the types of immunizations given

Applies from Z23 Encounter for immunization

Code first

• any routine childhood examination

Code also

• , if applicable, encounter for immunization safety counseling (Z71.85)

Notes

• procedure codes are required to identify the types of immunizations given

MS-DRG index

Defines the logic of DRG(s) 795 in MDC 15.

Approximate ICD-9-CM (GEMs)

• V05.9 Need for prophylactic vaccination and inoculation against unspecified single disease (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to Z23

Back-references to Z23

• Code Also: Z71.84 Encounter for health counseling related to travel (", if applicable, encounter for immunization (Z23)")
• Code Also: Z71.85 Encounter for immunization safety counseling (", if applicable, encounter for immunization (Z23)")

Back-references to Z23

• Code Also: Z71.84 Encounter for health counseling related to travel (", if applicable, encounter for immunization (Z23)")
• Code Also: Z71.85 Encounter for immunization safety counseling (", if applicable, encounter for immunization (Z23)")

Diagnosis Index entries for Z23

• Admission (for) › prophylactic (measure) › vaccination
• Immunization › encounter for
• Prophylactic › vaccination
• Vaccination (prophylactic) › encounter for

Nearby codes

• Z23 Encounter for immunization (this code)