ICD-10-CM 2027
ICD-10 code for desensitization to allergens admission
From the official ICD-10-CM alphabetic index entry “Admission (for) › desensitization to allergens”. Page updated September 29, 2026.
About coding desensitization to allergens admission
The ICD-10-CM code for desensitization to allergens admission is Z51.6 (Encounter for desensitization to allergens).
Within Z51 (encounter for other aftercare and medical care), Z51.6 is specifically for encounter for desensitization to allergens. Related codes cover antineoplastic radiation therapy (Z51.0), antineoplastic chemotherapy and immunotherapy (Z51.1), palliative care (Z51.5), other specified aftercare (Z51.8) and sepsis aftercare (Z51.A).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about desensitization to allergens admission ICD-10 codes
What is the ICD-10 code for desensitization to allergens admission?
- Z51.6 — Encounter for desensitization to allergens.
Is Z51.6 billable?
- Yes. Z51.6 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z51.6 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z51.6 a CC or MCC?
- No. Z51.6 is neither a CC nor an MCC under MS-DRG v44.0.