Z23
Z23: Encounter for immunization
Billable / specific codeICD-10-CMPOA exempt
Z23 is a billable, specific ICD-10-CM code for encounter for immunization. It is valid for submission on a claim.
Check Z23 with the rest of the claim: free scrubberCode first
The underlying condition must be sequenced before this code.
- any routine childhood examination
Code also
Both codes may be needed to describe the encounter fully. Sequencing depends on the reason for the visit.
- , if applicable, encounter for immunization safety counseling (Z71.85)
Notes
Additional guidance from the ICD-10-CM tabular list.
- procedure codes are required to identify the types of immunizations given
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
Z23 is named in 1 Medicare coverage policy: 1 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A54767Billing and Coding: Medicare Preventive Coverage for Certain Vaccines
Alphabetic index entries that lead here
- Immunization›encounter for
- Prophylactic›vaccination
- Vaccination›encounter for
- Admission›prophylactic›vaccination
Code history
Unchanged in every release from FY2024 to FY2027.