Z51.6 Encounter for desensitization to allergens

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applies from Z51 Encounter for other aftercare and medical care

Excludes1 (never code together)

• follow-up examination after treatment (Z08-Z09)

Code also

• condition requiring care

MS-DRG index

Defines the logic of DRG(s) 951 in MDC 23.

Approximate ICD-9-CM (GEMs)

• V07.1 Need for desensitization to allergens

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to Z51.6

Back-references to Z51.6

• Type 1 Excludes: Z29 Encounter for other prophylactic measures ("desensitization to allergens (Z51.6)")

Back-references to Z51

• Type 1 Excludes: Z08 Encounter for follow-up examination after completed treatment for malignant neoplasm ("aftercare following medical care (Z43-Z49, Z51)")
• Type 1 Excludes: Z09 Encounter for follow-up examination after completed treatment for conditions other than malignant neoplasm ("aftercare following medical care (Z43-Z49, Z51)")
• Type 2 Excludes: Z98 Other postprocedural states ("aftercare (Z43-Z49, Z51)")

Diagnosis Index entries for Z51.6

• Admission (for) › desensitization to allergens
• Encounter (with health service) (for) › desensitization to allergens

Nearby codes

• Z51.0 Encounter for antineoplastic radiation therapy
• Z51.1 Encounter for antineoplastic chemotherapy and immunotherapy
• 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 (this code)
• Z51.8 Encounter for other specified aftercare
• Z51.81 Encounter for therapeutic drug level monitoring
• Z51.89 Encounter for other specified aftercare
• Z51.A Encounter for sepsis aftercare