2026 ICD-10-CM Diagnosis Code S83.143DLateral subluxation of proximal end of tibia, unspecified knee, subsequent encounter
S83.143D is a billable ICD-10-CM diagnosis code for lateral subluxation of proximal end of tibia, unspecified knee, subsequent encounter. The 7th character D marks it as a subsequent encounter code, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Dislocations, subsequent encounter.
Code Identity
Code Classification
Present on Admission (POA)Billing
S83.143D is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Dislocation and sprain of joints and ligaments of knee (S83). 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
Dislocations
Dislocations are joint injuries that force the ends of your bones out of position. The cause is often a fall or a blow, sometimes from playing a contact sport. You can dislocate your ankles, knees, shoulders, hips, elbows and jaw. You can also dislocate your finger and toe joints.
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Convert S83.143D to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S83.143DOverview
Is S83.143D a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report lateral subluxation of proximal end of tibia, unspecified knee, subsequent encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character D in S83.143D mean?
The final character D marks a subsequent encounter: use it for routine care while the lateral subluxation of proximal end of tibia, unspecified knee is healing, after active treatment has ended.
What MS-DRG does S83.143D group to?
When lateral subluxation of proximal end of tibia, unspecified knee, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 949, 950, with relative weights from 0.6277 to 1.1897 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S83.143D 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 lateral subluxation of proximal end of tibia, unspecified knee, subsequent encounter on inpatient claims.
What is the ICD-9 equivalent of S83.143D?
Under the General Equivalence Mappings, lateral subluxation of proximal end of tibia, unspecified knee, subsequent encounter converts to ICD-9-CM V58.89 (other specfied aftercare). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
