ICD-10-CM-2023: Z51.6 Encounter for desensitization to allergens

Z40-Z53	Encounters for other specific health care
	Info:	Categories Z40-Z53 are intended for use to indicate a reason for care. They may be used for patients who have already been treated for a disease or injury, but who are receiving aftercare or prophylactic care, or care to consolidate the treatment, or to deal with a residual state
	Excl2.:	follow-up examination for medical surveillance after treatment (Z08-Z09)
Z51	Encounter for other aftercare and medical care
	Use add'l	condition requiring care
	Excl1.:	follow-up examination after treatment (Z08-Z09)
Z51.0	Encounter for antineoplastic radiation therapy
Z51.1	Encounter for antineoplastic chemotherapy and immunotherapy
	Excl2.:	encounter for chemotherapy and immunotherapy for nonneoplastic condition - code to condition
Z51.11	Encounter for antineoplastic chemotherapy
Z51.12	Encounter for antineoplastic immunotherapy
Z51.5	Encounter for palliative care
Z51.6	Encounter for desensitization to allergens
Z51.8	Encounter for other specified aftercare
	Excl1.:	holiday relief care (Z75.5)
Z51.81	Encounter for therapeutic drug level monitoring
	Use add'l	any long-term (current) drug therapy (Z79.-)
	Excl1.:	encounter for blood-drug test for administrative or medicolegal reasons (Z02.83)
Z51.89	Encounter for other specified aftercare

and

Encounter for other aftercare and medical care