Is ICD-10-CM code Z99 billable?

No, Z99 (Dependence on enabling machines and devices, not elsewhere classified) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code Z99 belong to?

Z99 belongs to Chapter 21 of the ICD-10-CM tabular list: Z00–Z99 (Factors Influencing Health Status and Contact with Health Services).

Z99Not billable, use a more specific code below

Dependence on enabling machines and devices, not elsewhere classified

In Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99), chapter 21: Factors Influencing Health Status and Contact with Health Services

7 billable codes under Z99: 2 are a CC; 2 map to HCC 211 (Respirator Dependence/Tracheostomy Status/Complications).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

Instructional notes

Also applies, from Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)

These notes sit on Z77-Z99 and apply to every code under it, including Z99.

Code also: add a code for this too, order depends on the encounter

any follow-up examination (Z08-Z09)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers when and how to use Z codes (Z00-Z99) for encounters and supplementary information, including contact, status, history, screening, aftercare, exams, and social determinants of health.

Use of Z Codes in Any Healthcare Setting (page 92)
Z Codes Indicate a Reason for an Encounter or Provide Additional Information about a Patient Encounter (page 93)
Categories of Z Codes (page 93)

Read Section I.C.21 (page 92)

All codes under Z99

Z99 can't be used on a claim. Pick a billable code below; grey headings group them.

Z99 MS-DRG

As the principal diagnosis, all 7 billable codes under Z99 group to MS-DRG 951 (v44.0).

DRG 951 Other Factors Influencing Health Status

Other codes that refer to Z99

Notes on these codes point to Z99.

Z74 Excludes2: dependence on enabling machines or devices NEC (Z99.-)
Z78 Excludes2: postprocedural status (Z93-Z99)

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.