Z79.64 – Long term (current) use of myelosuppressive agent

ICD-10-CM 2027 diagnosis code · Persons with potential health hazards related to family and personal history and certain conditions influencing health status

Billable code

ICD-10-CM code Z79.64
Code
Z79.64 (claims format: Z7964)
Description
Long term (current) use of myelosuppressive agent
Billable
Yes – valid for HIPAA-covered transactions
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
21. Factors influencing health status and contact with health services (Z00-Z99)
Block
Z77-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status
Parent codes
Z79 › Z79.6

Notes for Z79.64

Applicable to:
  • Long term (current) use of hydroxyurea

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Z79 – Long term (current) drug therapy

Includes:
  • long term (current) drug use for prophylactic purposes
Excludes2 (not included here):
  • drug abuse and dependence (F11-F19)
  • drug use complicating pregnancy, childbirth, and the puerperium (O99.32-)
Code also:
  • any therapeutic drug level monitoring (Z51.81)

Z79.6 – Long term (current) use of immunomodulators and immunosuppressants

Excludes2 (not included here):
  • long term (current) use of steroids (Z79.5-)
  • long term (current) use of agents affecting estrogen receptors and estrogen levels (Z79.81-)

Block Z77-Z99

Code also:
  • any follow-up examination (Z08-Z09)

Index terms for Z79.64

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in Z79.6

Frequently asked questions

What is ICD-10 code Z79.64?

Z79.64 is the ICD-10-CM code for long term (current) use of myelosuppressive agent, in the block Z77-Z99 (Persons with potential health hazards related to family and personal history and certain conditions influencing health status).

Is Z79.64 a billable code?

Yes. Z79.64 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does Z79.64 belong to?

It belongs to category Z79 – Long term (current) drug therapy.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.