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ICD-10-CM 2027 diagnosis code

T84.032AMechanical loosening of internal right knee prosthetic joint, initial encounter

✓ Billable / specificRequires 7th characterCC — complication/comorbidity

T84.032A is a valid, billable ICD-10-CM code for mechanical loosening of internal right knee prosthetic joint, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Mech loosening of internal right knee prosthetic joint, init

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 T84.032A

T84.032A is the ICD-10-CM diagnosis code for mechanical loosening of internal right knee prosthetic joint, initial encounter. 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 "A" means initial encounter: use it while the patient is receiving active treatment for the condition.

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 559 (Aftercare, Musculoskeletal System and Connective Tissue with MCC, relative weight 1.8088), DRG 560 (Aftercare, Musculoskeletal System and Connective Tissue with CC, relative weight 1.1238) and DRG 561 (Aftercare, Musculoskeletal System and Connective Tissue without CC/MCC, relative weight 0.8258), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), 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 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 996.41 (mechanical loosening of prosthetic joint).

7th character

Ainitial encounter

CC/MCC status for this injury by encounter: CC for A; Neither CC nor MCC for D, S.

Other encounter types for T84.032:

Notes that apply from higher levels

Instructions written at a parent level also apply to T84.032A.

› From T84 Complications of internal orthopedic prosthetic devices, implants and grafts
Excludes2
  • failure and rejection of transplanted organs and tissues (T86.-)
  • fracture of bone following insertion of orthopedic implant, joint prosthesis or bone plate (M96.6)

Broader instructions also apply from T80-T88 Complications of surgical and medical care, not elsewhere classified and Chapter 19: Injury, poisoning and certain other consequences of external causes.

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.

ICD-9-CM equivalent

Converter →
  • 996.41Mechanical loosening of prosthetic jointapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about T84.032A

Is T84.032A billable?

Yes. T84.032A is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "A" at the end of T84.032A mean?

It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.

Can T84.032A be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict T84.032A as a principal diagnosis.

Is T84.032A a CC or MCC?

T84.032A is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does T84.032A group to?

T84.032A is used in the MS-DRG v44.0 logic for MS-DRG 559 (Aftercare, Musculoskeletal System and Connective Tissue with MCC), MS-DRG 560 (Aftercare, Musculoskeletal System and Connective Tissue with CC) and MS-DRG 561 (Aftercare, Musculoskeletal System and Connective Tissue without CC/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 T84.032A?

The CMS General Equivalence Mappings map T84.032A to ICD-9-CM 996.41.