ICD-10-CM 2027 diagnosis code
T84.033SMechanical loosening of internal left knee prosthetic joint, sequela
T84.033S is a valid, billable ICD-10-CM code for mechanical loosening of internal left knee prosthetic joint, sequela. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Mech loosening of internal left knee prosth joint, sequela
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About T84.033S
T84.033S is the ICD-10-CM diagnosis code for mechanical loosening of internal left knee prosthetic joint, sequela. It belongs to category T84 (complications of internal orthopedic prosthetic devices, implants and grafts), block T80-T88 (complications of surgical and medical care, not elsewhere classified) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
The 7th character "S" means sequela: use it for complications or conditions that arise as a direct result of the original condition.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 922 (Other Injury, Poisoning and Toxic Effect Diagnoses with MCC, relative weight 1.6238) and DRG 923 (Other Injury, Poisoning and Toxic Effect Diagnoses without MCC, relative weight 0.9973), in MDC 21 (Injuries, Poisonings and Toxic Effects of Drugs), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 909.3 (late effect of complications of surgical and medical care).
7th character
Ssequela
CC/MCC status for this injury by encounter: CC for A; Neither CC nor MCC for D, S.
Other encounter types for T84.033:
Notes that apply from higher levels
Instructions written at a parent level also apply to T84.033S.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 21 · Injuries, Poisonings and Toxic Effects of Drugs
ICD-9-CM equivalent
Converter →- 909.3Late effect of complications of surgical and medical careapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about T84.033S
Is T84.033S billable?
- Yes. T84.033S is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "S" at the end of T84.033S mean?
- It is the 7th character for sequela. Per the official guidelines, use it for complications or conditions that arise as a direct result of the original condition.
Can T84.033S be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict T84.033S as a principal diagnosis.
Is T84.033S a CC or MCC?
- No. T84.033S is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does T84.033S group to?
- T84.033S is used in the MS-DRG v44.0 logic for MS-DRG 922 (Other Injury, Poisoning and Toxic Effect Diagnoses with MCC) and MS-DRG 923 (Other Injury, Poisoning and Toxic Effect Diagnoses without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for T84.033S?
- The CMS General Equivalence Mappings map T84.033S to ICD-9-CM 909.3.