Table of Contents

Varicella Vaccine Group Evaluation and Forecasting Rules

General Rules for Varicella

General rules are not series-specific; general rules apply to the entire vaccine group.

For persons born prior to 1/1/1980, if the series is NOT complete, the Recommendation is Conditional and the reason code is HIGH_RISK.

If a patient has immunity (reported as having a positive titer or serology) vaccine is not recommended; Recommendation is Not Recommended and the reason code is PROOF_OF_IMMUNITY.
Any shot administered prior to the date of immunity is evaluated as Valid or Invalid, based on minimum age and minimum interval rules.
Any shot administered on or after the date of immunity is evaluated as Accepted with a reason code of PROOF_OF_IMMUNITY unless the series is COMPLETE.

If a patient has documented history of varicella (clinician verified) vaccine is not recommended; Recommendation is Not Recommended and the reason code is DISEASE_DOCUMENTED.
Any shot administered prior to the disease history date is evaluated as Valid or Invalid, based on minimum age and minimum interval rules.
Any shot administered on or after the disease history date is evaluated as Accepted with a reason code of DISEASE_DOCUMENTED unless the series is COMPLETE.

The Live Vaccine Interval rule (also referred to as the Live Virus rule) applies to all varicella vaccines. For rule details, see the Live Vaccine Interval rule on the General ICE Rules page.

CVX Code	Name
21	Varicella

CVX Code	Vaccine Name	Component CVX Code	Component Vaccine Name
94	MMRV	21	Varicella

CVX 94 (MMRV) is not licensed for patients >= 13 years old. This does not affect evaluation; however, see the rule Vaccine Administered Outside of Licensed Age Range on the General ICE Rules page.

The Varicella series is complete after 2 doses.

Vaccine Dose Parameters - Minimum and Routine Ages

Dose	Series Name	Absolute Minimum Age	Minimum Age	Routine Age	Latest Recommended Age (less than)	Valid CVX Code(s) per Dose for this Series	Invalid CVX Code(s) per Dose for this Series
1	Varicella	1 year - 4 days	1 year	1 year	16 months + 4 weeks	21, 94	N/A
2	Varicella	13 months	15 months	4 years	7 years + 4 weeks	21, 94	N/A

Vaccine Dose Parameters - Minimum and Recommended Intervals

Doses	Series Name	Absolute Minimum Interval	Minimum Interval	Recommended Interval	Latest Recommended Interval (less than)
Dose 1 to 2	Varicella	28 days if < 13 years of age 24 days if >= 13 years of age¹	12 weeks if < 13 years of age 4 weeks if >= 13 years of age	84 days (12 weeks) if < 13 years of age² 28 days (4 weeks) if >= 13 years of age	6 years + 4 weeks

Recommended interval between dose 1 and dose 2 is dependent upon the age of the patient at dose 1 (< or >= 13 years)
- If the shot for target dose 1 is invalid, the recommended interval between the invalid shot and target dose 1 is 28 days.

¹Per the Live Vaccine Interval rule, an absolute minimum interval of 28 days is required for CVX 94 (MMRV). For rule details, see the Live Vaccine Interval rule on the General ICE Rules page.
²The recommended interval for < 13 years of age differs from the CDC CDSi recommended interval of 3 years. While the recommended intervals differ, in practice ICE and CDC CDSi will come up with the same recommended due date. CDC CDSi only uses the recommended interval when the recommended age is not provided. See the CDC CDSi Logic Specification for details on how they calculate their recommended due date.