Z91.13 (Patient's unintentional underdosing of medication regimen) is an umbrella ICD-10-CM medical diagnosis code in the Factors influencing health status and contact with health services chapter. It identifies cases of patient's unintentional underdosing of medication regimen for clinical documentation, billing and e

ICD-10-CM · Category

Z91.13 — Patient's unintentional underdosing of medication regimen

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

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Sub-codes under Z91.13

Z91.130Pt unintent undrdose of meds regimen due to age-rel debilityZ91.138Patient's unintent undrdose of meds regimen for oth reason

Related diagnoses

Z91.11Patient's noncompliance with dietary regimenZ91.12Patient's intentional underdosing of medication regimenZ91.14Patient's other noncompliance with medication regimenZ91.15Patient's noncompliance with renal dialysisZ91.19Patient's noncompliance w oth medical treatment and regimen

Common questions about Z91.13 (Patient's unintentional underdosing of medication regimen)

What does ICD-10 code Z91.13 mean?
Z91.13 is the ICD-10-CM 2025 code for Patient's unintentional underdosing of medication regimen. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.
Is Z91.13 a billable diagnosis code?
Z91.13 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under Z91.13. Browse the sub-codes listed on this page.
Which ICD-10 chapter does Z91.13 belong to?
Z91.13 belongs to the chapter "Factors influencing health status and contact with health services" (codes Z00-Z99). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.
Where can I get plain-language information about Patient's unintentional underdosing of medication regimen?
For a plain-language explanation of Patient's unintentional underdosing of medication regimen, ask GoDavaii's Health AI - it explains medical conditions in 22+ Indian languages, free, with no signup. Tap "Ask GoDavaii AI about Patient's unintentional underdosing of medication regimen" above to get a personalised answer.

Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗