2026 ICD-10-CM Diagnosis Code Z89.511Acquired absence of right leg below knee

ICD-10-CM Codes›Z00–Z99›Z77-Z99›Z89

ICD-10-CM Z89.511
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z89.511 is a billable ICD-10-CM diagnosis code for acquired absence of right leg below knee. 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. Coders also document this condition as amputated below knee. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acquired absence of limb or organ.

Code Identity

ICD-10-CM Code
Z89.511
Billable Status
Yes — Valid for Submission
Code Describes
Acquired absence of right leg below knee
Short Description
Acquired absence of right leg below knee
Same as the full description in the CMS dataset.
Parent Code
Z89.51
Acquired absence of leg below knee

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
CategoryZ89Acquired absence of limb
This CodeZ89.511Acquired absence of right leg below knee

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z89.511.

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

Z89.511 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.

  • Amputated below knee
  • Amputated right lower limb below knee
  • History of amputation of left and right leg through tibia and fibula
  • History of amputation of left leg through tibia and fibula
  • History of amputation of leg through tibia and fibula
  • History of amputation of right leg through tibia and fibula

Clinical ClassificationClinical

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

CCSR FAC022
Acquired absence of limb or organ
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

Limb Loss

People can lose all or part of an arm or leg for many reasons. Common ones include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Z89.511 to ICD-9-CMHistory

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

ICD-9-CM
V49.75 Status amput below knee
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 Z89.511Overview

Is Z89.511 (Acquired absence of leg below knee) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acquired absence of right leg below knee on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can Z89.511 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because acquired absence of right leg below knee describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z89.511 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 acquired absence of right leg below knee on inpatient claims.

What is the ICD-9 equivalent of Z89.511?

Under the General Equivalence Mappings, acquired absence of right leg below knee converts to ICD-9-CM V49.75 (status amput below knee). The mapping is approximate, so confirm the match fits the documentation.