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Z91.13

Non-billable

Patient's unintentional underdosing of medication regimen

Z91.13 is the ICD-10-CM code for Patient's unintentional underdosing of medication regimen. It is a non-billable category code — use a more specific child code such as Z91.130 for billing.

Status
Header (non-billable)
Chapter
Z00-Z99
Parent
Z91.1
Subcodes
2
Edition
FY2026

Z00-Z99 Factors influencing health status and contact with health services

Code first

  • •underdosing of medication (T36-T50) with fifth or sixth character 6

Frequently asked questions

What is ICD-10 code Z91.13?
Z91.13 is the ICD-10-CM code for "Patient's unintentional underdosing of medication regimen". It falls under Z00-Z99 Factors influencing health status and contact with health services.
Is Z91.13 a billable code?
No — Z91.13 is a non-billable header code. Use a more specific child code (such as Z91.130) for billing.
What are the subcodes of Z91.13?
Z91.13 has 2 more specific child codes, including Z91.130, Z91.138.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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