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Z91.13

⚠ Non-billable (Header)

Patient's unintentional underdosing of medication regimen

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

⚠️ This is a category header code — not billable. Use a more specific child code below.

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📋 Code Instructions

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

⚠️ Excludes2

inherited from Z91.1

Rules from parent category Z91.1: Patient's noncompliance with medical treatment and regimen

  • • caregiver noncompliance with patient's medical treatment and regimen (Z91.A-)

Child Codes (2)

Z91.130Patient's unintentional underdosing of medication regimen due to age-related debilityZ91.138Patient's unintentional underdosing of medication regimen for other reason

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Code Information

CodeZ91.13
BillableNo — Header code
ParentZ91.1
CategoryFactors influencing health status and contact with health services (Z00-Z99)
Excludes10 rule(s)
Excludes21 note(s)
Child codes2

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)