Z91Header code — not billable
Personal risk factors, not elsewhere classified
- Chapter
- 21. Factors influencing health status and contact with health services
- Category
- Z91
- Effective date
- October 1, 2026
Related codes in category Z91
Z91.0Allergy status, oth than to drugs and biological substancesZ91.01Food allergy statusZ91.010Allergy to peanutsYesZ91.011Allergy to milk productsZ91.0110Allergy to milk products, unspecifiedYesZ91.0111Allergy to milk products with tolerance to baked milkYesZ91.0112Allergy to milk products with reactivity to baked milkYesZ91.012Allergy to eggsZ91.0120Allergy to eggs, unspecifiedYesZ91.0121Allergy to eggs with tolerance to baked eggYesZ91.0122Allergy to eggs with reactivity to baked eggYesZ91.013Allergy to seafoodYes
Frequently asked questions
What is ICD-10 code Z91?
Z91 is an ICD-10-CM diagnosis code for Personal risk factors, not elsewhere classified.
Is Z91 a billable code?
No. Z91 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is Z91 in?
Z91 falls under Chapter 21: Factors influencing health status and contact with health services.
When did Z91 become effective?
Z91 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to Z91?
Z91 belongs to category Z91, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.