Y63.6 Underdosing and nonadministration of necessary drug, medicament or biological substance

ICD-10-CM Code Y63.6: Underdosing and Nonadministration of Necessary Drug, Medicament or Biological Substance

ICD-10-CM code Y63.6 identifies the underdosing and nonadministration of a necessary drug, medicament, or biological substance. It is classified within Chapter 20, External causes of morbidity, under the category Y63 for failure in dosage during surgical and medical care. The code is presented as a billable, specific code without child codes or sequencing instructions. 2 4

Plain-language overview

Code Y63.6 is described as underdosing and nonadministration of necessary drug, medicament or biological substance. It is listed in Chapter 20, External causes of morbidity, according to the referenced coding data. 2 4

What this code represents

In the April 2026 reference data, Y63.6 has no child codes and is presented as a billable and specific code. It is categorized under Y63, Failure in dosage during surgical and medical care, within the Y62-Y84 range for complications of medical and surgical care. 2

Coding details

The reference record for Y63.6 lists no inclusion terms. Additionally, no "code first" instruction and no "use additional code" instruction are listed for Y63.6. 2

Documentation considerations

The supplied excerpts do not contain clinical documentation elements or charting criteria for Y63.6. The available reference data only provides the code description, chapter placement, and the absence of specific coding instructions. 2

Coverage and utilization context

Code Y63.6 is referenced in a CMS billing and coding article for drugs and biologicals alongside code Y63.8. The CMS article text does not explicitly establish payer-specific coverage criteria for this code. 1

What the sources add

The CMS article references Y63.6 in the context of billing and coding for drugs and biologicals, while the Vero source provides the code's hierarchical placement and billable status. These sources provide different operational and structural details for the same code. 1 2

The Belgium ICD-10 reference and the Codigo reference both list Y63.6 with the official description of underdosing and nonadministration of necessary drug, medicament or biological substance. Both sources independently confirm the code's existence and its assigned label. 3 4

Sources

1. Article - Billing and Coding: Drugs and Biologicals (A52855) — cms.gov; accessed 2026-07-25.
2. ICD-10-CM Code Y63.6 | Vero — veroscribe.com; accessed 2026-07-25.
3. ICD10BE — icd10be.health.belgium.be; accessed 2026-07-25.
4. Codigo. The #1 Billing Agency for Medical Practices — codigo.care; accessed 2026-07-25.