2027 ICD-10-CM Diagnosis Code T84.50XSInfection and inflammatory reaction due to unspecified internal joint prosthesis, sequela

ICD-10-CM Codes›S00–T88›T80-T88›T84

ICD-10-CM T84.50XS
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

T84.50XS is a billable ICD-10-CM diagnosis code for infection and inflammatory reaction due to unspecified internal joint 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 922 through 923. The code is exempt from POA reporting. Coders also document this condition as prosthetic joint infection. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication, sequela.

Code Identity

ICD-10-CM Code
T84.50XS
Billable Status
Yes — Valid for Submission
Code Describes
Infection and inflammatory reaction due to unspecified internal joint prosthesis, sequela
Short Description
Infect/inflm reaction due to unsp int joint prosth, sequela
Parent Code
T84.50
Infection and inflammatory reaction due to unspecified internal joint prosthesis

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT80-T88Complications of surgical and medical care, not elsewhere classified
CategoryT84Complications of internal orthopedic prosthetic devices, implants and grafts
This CodeT84.50XSInfection and inflammatory reaction due to unspecified internal joint prosthesis, sequela

Present on Admission (POA)Billing

T84.50XS is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Complications of surgical and medical care, not elsewhere classified (T80-T88).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Prosthetic joint infection

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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to T84.50XS: its own notes plus those printed at T84.5, T84, block T80-T88, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From T84 Complications of internal orthopedic prosthetic devices, implants and grafts applies to 357 codes
  • failure and rejection of transplanted organs and tissues (T86.-)
  • fracture of bone following insertion of orthopedic implant, joint prosthesis or bone plate (M96.6)
From Block T80-T88 Complications of surgical and medical care, not elsewhere classified applies to 1,683 codes
  • any encounters with medical care for postprocedural conditions in which no complications are present, such as:
  • artificial opening status (Z93.-)
  • closure of external stoma (Z43.-)
  • fitting and adjustment of external prosthetic device (Z44.-)
  • burns and corrosions from local applications and irradiation (T20-T32)
  • complications of surgical procedures during pregnancy, childbirth and the puerperium (O00-O9A)
  • mechanical complication of respirator [ventilator] (J95.850)
  • poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4 or 6)
  • postprocedural fever (R50.82)
  • specified complications classified elsewhere, such as:
  • cerebrospinal fluid leak from spinal puncture (G97.0)
  • colostomy malfunction (K94.0-)
  • disorders of fluid and electrolyte imbalance (E86-E87)
  • functional disturbances following cardiac surgery (I97.0-I97.1)
  • intraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-)
  • ostomy complications (J95.0-, K94.-, N99.5-)
  • postgastric surgery syndromes (K91.1)
  • postlaminectomy syndrome NEC (M96.1)
  • postmastectomy lymphedema syndrome (I97.2)
  • postsurgical blind-loop syndrome (K91.2)
  • ventilator associated pneumonia (J95.851)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From T84.5 Infection and inflammatory reaction due to internal joint prosthesis applies to 18 codes
  • code to identify infection
From Block T80-T88 Complications of surgical and medical care, not elsewhere classified applies to 1,683 codes
  • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
  • code(s) to identify the specified condition resulting from the complication
  • code to identify devices involved and details of circumstances (Y62-Y82)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From T84 Complications of internal orthopedic prosthetic devices, implants and grafts applies to 357 codes
  • The appropriate 7th character is to be added to each code from category T84
Values for category T84 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela this code

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name T84.50XS, its category, or a range that includes it.

Excludes2 5

These codes carry an Excludes2 note naming T84.50XS: its condition is not part of those codes, and both may be reported when the patient has both.

  • M00 Pyogenic arthritis
    infection and inflammatory reaction due to internal joint prosthesis (T84.5-) names T84.5-, which includes this code
  • M96 Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified
    complications of internal orthopedic prosthetic devices, implants and grafts (T84.-) names T84.-, which includes this code
  • M96.6 Fracture of bone following insertion of orthopedic implant, joint prosthesis, or bone plate
    complication of internal orthopedic devices, implants or grafts (T84.-) names T84.-, which includes this code
  • T80.2 Infections following infusion, transfusion and therapeutic injection
    infections specified as due to prosthetic devices, implants and grafts (T82.6-T82.7, T83.5-T83.6, T84.5-T84.7, T85.7) names T84.5-T84.7, which includes this code
  • T81.4 Infection following a procedure
    infection due to prosthetic devices, implants and grafts (T82.6-T82.7, T83.5-T83.6, T84.5-T84.7, T85.7) names T84.5-T84.7, which includes this code

Clinical ClassificationClinical

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

CCSR INJ076
Complication, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

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 T84.50XS to ICD-9-CMHistory

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

ICD-9-CM
909.3 Late eff surg/med compl
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About T84.50XSOverview

Is T84.50XS a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report infection and inflammatory reaction due to unspecified internal joint prosthesis, sequela on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character S in T84.50XS mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the infection and inflammatory reaction due to unspecified internal joint prosthesis itself has resolved, not the original event.

What MS-DRG does T84.50XS group to?

When infection and inflammatory reaction due to unspecified internal joint prosthesis, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 923, 922, with relative weights from 0.9980 to 1.6248 depending on complications. Higher weights mean higher Medicare reimbursement.

Is T84.50XS 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 infection and inflammatory reaction due to unspecified internal joint prosthesis, sequela on inpatient claims. The code appears in the Complications of surgical and medical care, not elsewhere classified (T80-T88) range of the CMS exempt list.

Does T84.50XS need an additional code?

When the condition applies, yes. The Use Additional Code note at T84.5, which applies to T84.50XS, reads: code to identify infection. The additional code is reported after T84.50XS.