2026 ICD-10-CM Diagnosis Code Z98.1Arthrodesis status

ICD-10-CM Codes›Z00–Z99›Z77-Z99›Z98

ICD-10-CM Z98.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z98.1 is a billable ICD-10-CM diagnosis code for arthrodesis status. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Implant, device or graft related encounter.

Code Identity

ICD-10-CM Code
Z98.1
Billable Status
Yes — Valid for Submission
Code Describes
Arthrodesis status
Short Description
Arthrodesis status
Same as the full description in the CMS dataset.
Parent Code
Z98
Other postprocedural states

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ77-Z99Persons with potential health hazards related to family and personal history and certain conditions influencing health status
CategoryZ98Other postprocedural states
This CodeZ98.1Arthrodesis status

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z98.1.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

Z98.1 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • H/O: arthrodesis
  • History of ankle surgery
  • History of arthrodesis of ankle
  • History of arthrodesis of interphalangeal joint of toe
  • History of cervical spine fusion
  • History of fusion of thoracic spine
  • History of fusion of thoracolumbar spine
  • History of lumbar fusion
  • History of operative procedure on lumbar spinal structure
  • History of operative procedure on thoracic spinal structure
  • History of spinal fusion
  • History of spinal fusion for kyphosis
  • History of spinal fusion for scoliosis
  • History of surgical procedure on cervical spine
  • History of tibiotalocalcaneal arthrodesis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Ankylosis(fibrous) (osseous) (joint)
      • arthrodesis status
    • Ankylosis(fibrous) (osseous) (joint)
      • postoperative (status)
    • Ankylosis(fibrous) (osseous) (joint)
      • produced by surgical fusion, status
    • Ankylosis(fibrous) (osseous) (joint)
      • surgical
    • Arthrodesis status
    • Fusion, fused(congenital)
      • lumbosacral (acquired)
        • arthrodesis status
    • Fusion, fused(congenital)
      • lumbosacral (acquired)
        • postprocedural status
    • Fusion, fused(congenital)
      • sacroiliac (joint) (acquired)
        • arthrodesis status
    • Fusion, fused(congenital)
      • sacroiliac (joint) (acquired)
        • postprocedural status
    • Fusion, fused(congenital)
      • spine (acquired) NEC
        • arthrodesis status
    • Fusion, fused(congenital)
      • spine (acquired) NEC
        • postoperative status
    • Status(post)
      • arthrodesis

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC009
Implant, device or graft related encounter
Default principal diagnosis: inpatient No · outpatient Yes

Convert Z98.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V45.4 Arthrodesis status
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z98.1Overview

Is Z98.1 (Other postprocedural states) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report arthrodesis status on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can Z98.1 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because arthrodesis status describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z98.1 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for arthrodesis status on inpatient claims.

What is the ICD-9 equivalent of Z98.1?

Under the General Equivalence Mappings, arthrodesis status converts to ICD-9-CM V45.4 (arthrodesis status). The mapping is approximate, so confirm the match fits the documentation.