2026 ICD-10-CM Diagnosis Code T84.021SDislocation of internal left hip prosthesis, sequela
T84.021S is a billable ICD-10-CM diagnosis code for dislocation of internal left hip prosthesis, 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
T84.021S 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.
- Dislocation of hip joint prosthesis
- Dislocation of left hip joint prosthesis
- Instability of left hip joint
- Instability of prosthesis of joint of hip
- Instability of prosthetic left hip joint
- Left hip prosthetic joint malposition
- Left hip subluxation
- Malposition of prosthetic joint of hip
- Recurrent dislocation of hip
- Recurrent dislocation of hip joint prosthesis
- Recurrent dislocation of left hip
- Recurrent dislocation of left hip joint prosthesis
- Subluxation of prosthesis of hip joint
- Subluxation of prosthesis of left hip joint
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
Hip Replacement
Hip replacement is surgery for people with severe hip damage. The most common cause of damage is osteoarthritis. Osteoarthritis causes pain, swelling, and reduced motion in your joints. It can interfere with your daily activities.
Read the full article at MedlinePlus
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Convert T84.021S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T84.021SOverview
Is T84.021S (Dislocation of internal left hip prosthesis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report dislocation of internal left hip prosthesis, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in T84.021S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the dislocation of internal left hip prosthesis itself has resolved, not the original event.
What MS-DRG does T84.021S group to?
When dislocation of internal left hip prosthesis, 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 T84.021S 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 dislocation of internal left hip prosthesis, sequela on inpatient claims.
What is the ICD-9 equivalent of T84.021S?
Under the General Equivalence Mappings, dislocation of internal left hip prosthesis, sequela converts to ICD-9-CM 909.3 (late eff surg/med compl). The mapping is approximate, so confirm the match fits the documentation.
