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Y83.4 ICD-10-CM Code: Other reconstructive surgery as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure

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FY 2026 Apr update / External causes of morbidity (V00-Y99) / Surgical and other medical procedures as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure (Y83-Y84)

Y83.4

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Other reconstructive surgery as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure

Reconstructive surgery (such as repair of a defect or restoration of function) caused an unexpected harmful reaction or complication in the patient.

CMS-HCC V28

0

0

RAF 0

CMS-HCC V24

0

0

RAF 0

ACA/HHS

0

0

RAF 0

ESRD/PACE

0

0

RAF 0

RXHCC

0

0

RAF 0

Code Trumping

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Code Book Path

Official
Y83Surgical operation and other surgical procedures as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.4Other reconstructive surgery as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for Y83.4 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for Y83.4 in this effective period.

Related Child Codes

Official
Y83.0Surgical operation with transplant of whole organ as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.1Surgical operation with implant of artificial internal device as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.2Surgical operation with anastomosis, bypass or graft as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.3Surgical operation with formation of external stoma as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.5Amputation of limb(s) as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure

Includes

Official

ICD-10-CM does not list Includes notes for Y83.4 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for Y83.4 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for Y83.4 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for Y83.4 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for Y83.4 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance
Document the specific type of reconstructive surgery performed for clarity
This code covers complications from the reconstruction procedure, excluding transplants, implants, and stoma creation

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is Y83.4 an HCC code?

No. Y83.4 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

Y83.4 is the ICD-10-CM diagnosis code for other reconstructive surgery as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure. Reconstructive surgery (such as repair of a defect or restoration of function) caused an unexpected harmful reaction or complication in the patient. Y83.4 sits in the ICD-10-CM chapter for external causes of morbidity (v00-y99), within the section covering surgical and other medical procedures as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure (y83-y84).

Y83.4 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Document the specific type of reconstructive surgery performed for clarity.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Y83.4 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •Document the specific type of reconstructive surgery performed for clarity
  • •This code covers complications from the reconstruction procedure, excluding transplants, implants, and stoma creation

Child Codes

Y83.0Surgical operation with transplant of whole organ as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.1Surgical operation with implant of artificial internal device as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.2Surgical operation with anastomosis, bypass or graft as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.3Surgical operation with formation of external stoma as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.4Other reconstructive surgery as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.5Amputation of limb(s) as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.6Removal of other organ (partial) (total) as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.8Other surgical procedures as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
Y83.9Surgical procedure, unspecified as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure

Code Hierarchy

└Y83Surgical operation and other surgical procedures as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure└Y83.4Other reconstructive surgery as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
└Y83.4Other reconstructive surgery as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure

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