ICD-10-CM · Z23
ICD-10 Z23: Encounter for immunization
Vaccine administration. Z23 is the encounter code; CPT vaccine product + admin codes report the vaccine itself.
Code
Z23
Category
Factors influencing health status (Z00-Z99)
Clinical context
Vaccine administration. Z23 is the encounter code; CPT vaccine product + admin codes report the vaccine itself.
Documentation requirements
- Vaccines administered
- VIS distribution
- VAERS reporting awareness
Common related procedures
- 90471-90474 admin codes
- Specific vaccine CPT (90686 flu, 90707 MMR, etc.)
Common payer denial patterns
- Wrong POS for vaccines (e.g., POS 11 vs Mass Immunization POS 60)
- Adult vaccines may need preventive E&M paired
Frequently asked questions
What does ICD-10 Z23 mean?
Encounter for immunization
When is this code documented?
Vaccine administration. Z23 is the encounter code; CPT vaccine product + admin codes report the vaccine itself.
What documentation supports this code?
Vaccines administered; VIS distribution; VAERS reporting awareness.
What are common denials associated with this diagnosis?
Wrong POS for vaccines (e.g., POS 11 vs Mass Immunization POS 60); Adult vaccines may need preventive E&M paired.
Related diagnoses
- Z00.00 — Encounter for general adult medical examination without abnormal findings
- Z00.121 — Encounter for routine child health examination with abnormal findings
- Z00.129 — Encounter for routine child health examination without abnormal findings
- Z01.419 — Encounter for gynecological examination without abnormal findings
- Z11.51 — Encounter for screening for human papillomavirus (HPV)
- Z12.11 — Encounter for screening for malignant neoplasm of colon
Sources
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