2026 ICD-10-CM Diagnosis Code T84.039SMechanical loosening of unspecified internal prosthetic joint, sequela
T84.039S is a billable ICD-10-CM diagnosis code for mechanical loosening of unspecified internal prosthetic joint, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 922 through 923. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
T84.039S 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.
- Loosening of acetabular cup of total hip replacement
- Loosening of femoral component of total knee replacement
- Loosening of femoral stem of total hip replacement
- Loosening of hip joint hemiarthroplasty
- Loosening of hip joint prosthesis
- Loosening of knee joint prosthesis
- Loosening of tibial component of total knee replacement
- Loosening of total hip replacement
- Loosening of total knee replacement
- Loosening of unicondylar knee replacement
- Prosthetic joint loosening
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Complications of internal orthopedic prosthetic devices, implants and grafts (T84). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Joint Disorders
Your joints are places where two or more bones come together. Your shoulders, elbows, hips, knees, and knuckles are all joints. Your spine has joints, too.
The full article covers:
- What are joints?
- What are joint disorders?
- What diseases can affect the joints?
- What types of joint disorders happen from sudden injuries?
- What types of joint disorders happen from overuse?
- How can I keep my joints healthy?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T84.039S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T84.039SOverview
Is T84.039S a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report mechanical loosening of unspecified internal prosthetic joint, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in T84.039S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the mechanical loosening of unspecified internal prosthetic joint itself has resolved, not the original event.
What MS-DRG does T84.039S group to?
When mechanical loosening of unspecified internal prosthetic joint, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, with relative weights from 1.0177 to 1.7494 depending on complications. Higher weights mean higher Medicare reimbursement.
Is T84.039S 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 mechanical loosening of unspecified internal prosthetic joint, sequela on inpatient claims.
What is the ICD-9 equivalent of T84.039S?
Under the General Equivalence Mappings, mechanical loosening of unspecified internal prosthetic joint, sequela converts to ICD-9-CM 909.3 (late eff surg/med compl). The mapping is approximate, so confirm the match fits the documentation.
