Z28.311 is the authoritative medical code for Partially vaccinated for COVID-19. This classification is used in medical billing and clinical recording to specify the clinical criteria for partially vaccinated for covid-19 (ICD-10-CM Z28.311), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Partially vaccinated for COVID-19 is a billable ICD-10-CM diagnosis code Z28.311. Includes: vaccination not carried out. Use additional code: code, if applicable, to identify:; immunization not carried out because of contraindication Z28.0-; immunization not carried out because of patient decision for other and unspecified reason Z28.2-; immunization not carried out because of patient decision for reasons of belief or group pressure Z28.1; immunization not carried out for other reason Z28.8-. Code also: , if applicable, encounter for immunization safety counseling Z71.85.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for Z28.311 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- vaccination not carried out
Code Also
Additional codes that may be required to fully describe the encounter.
- , if applicable, encounter for immunization safety counseling Z71.85
Use Additional Code
Supplementary codes the tabular list directs you to add.
- code, if applicable, to identify:
- immunization not carried out because of contraindication Z28.0-
- immunization not carried out because of patient decision for other and unspecified reason Z28.2-
- immunization not carried out because of patient decision for reasons of belief or group pressure Z28.1
- immunization not carried out for other reason Z28.8-
Frequently Asked Questions (FAQ) & Clinical Guidance
Is an additional code needed with Z28.311?
Use additional code(s) to specify: code, if applicable, to identify:; immunization not carried out because of contraindication (Z28.0-); immunization not carried out because of patient decision for other and unspecified reason (Z28.2-); immunization not carried out because of patient decision for reasons of belief or group pressure (Z28.1).
Codes in This Family (22)
Official ICD-10-CM classifications in the same code family as Z28.311, with their registry titles.
- Z28 — Immunization not carried out and underimmunization status
- Z28.0 — Immunization not carried out because of contraindication
- Z28.01 — Immunization not carried out because of acute illness of patient
- Z28.02 — Immunization not carried out because of chronic illness or condition of patient
- Z28.03 — Immunization not carried out because of immune compromised state of patient
- Z28.04 — Immunization not carried out because of patient allergy to vaccine or component
- Z28.09 — Immunization not carried out because of other contraindication
- Z28.1 — Immunization not carried out because of patient decision for reasons of belief or group pressure
- Z28.2 — Immunization not carried out because of patient decision for other and unspecified reason
- Z28.20 — Immunization not carried out because of patient decision for unspecified reason
- Z28.21 — Immunization not carried out because of patient refusal
- Z28.29 — Immunization not carried out because of patient decision for other reason
- Z28.3 — Underimmunization status
- Z28.31 — Underimmunization for COVID-19 status
- Z28.310 — Unvaccinated for COVID-19
- Z28.39 — Other underimmunization status
- Z28.8 — Immunization not carried out for other reason
- Z28.81 — Immunization not carried out due to patient having had the disease
- Z28.82 — Immunization not carried out because of caregiver refusal
- Z28.83 — Immunization not carried out due to unavailability of vaccine
- Z28.89 — Immunization not carried out for other reason
- Z28.9 — Immunization not carried out for unspecified reason
Indexed Clinical Terms (5)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- COVID-19, partially vaccinated (for)
- Immunization, partial, for COVID-19
- Status (post), underimmunization, COVID-19, partially vaccinated (for)
- Underimmunization status, COVID-19, partially vaccinated (for)
- Vaccination (prophylactic), partial, for COVID-19
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: