ICD-10-CM Code Z18.33

Retained wood fragments

Version 2020 Billable Code Unacceptable Principal Diagnosis POA Exempt

Valid for Submission

Z18.33 is a billable code used to specify a medical diagnosis of retained wood fragments. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code Z18.33 might also be used to specify conditions or terms like foreign body in heel, foreign body in lip, o/e - foreign body in skin, o/e - splinter in skin, splinter in face, splinter in neck, etc The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

The code Z18.33 describes a circumstance which influences the patient's health status but not a current illness or injury. The code is unacceptable as a principal diagnosis.

Short Description:Retained wood fragments
Long Description:Retained wood fragments

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code Z18.33 are found in the index:

Code Edits

The Medicare Code Editor (MCE) detects and reports errors in the coding of claims data. The following ICD-10 Code Edits are applicable to this code:

  • Unacceptable principal diagnosis - There are selected codes that describe a circumstance which influences an individual’s health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Foreign body in heel
  • Foreign body in lip
  • O/E - foreign body in skin
  • O/E - splinter in skin
  • Splinter in face
  • Splinter in neck
  • Splinter in skin
  • Wood splinter in abdomen
  • Wood splinter in ankle
  • Wood splinter in anterior region of neck
  • Wood splinter in axilla
  • Wood splinter in back
  • Wood splinter in breast
  • Wood splinter in buttock
  • Wood splinter in calf
  • Wood splinter in cheek
  • Wood splinter in chest
  • Wood splinter in dorsum of foot
  • Wood splinter in ear region
  • Wood splinter in elbow
  • Wood splinter in eye region
  • Wood splinter in face
  • Wood splinter in foot
  • Wood splinter in forearm
  • Wood splinter in forehead
  • Wood splinter in genitalia
  • Wood splinter in great toe
  • Wood splinter in groin
  • Wood splinter in head
  • Wood splinter in head and neck
  • Wood splinter in heel
  • Wood splinter in hip
  • Wood splinter in knee
  • Wood splinter in lip
  • Wood splinter in lower leg
  • Wood splinter in mouth
  • Wood splinter in neck
  • Wood splinter in perineum
  • Wood splinter in pharynx
  • Wood splinter in shin
  • Wood splinter in shoulder
  • Wood splinter in sole of foot
  • Wood splinter in thigh
  • Wood splinter in toe
  • Wood splinter in trunk
  • Wood splinter in upper arm
  • Wood splinter in wrist

Present on Admission (POA)

Z18.33 is exempt from POA reporting - The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement. Review other POA exempt codes here .

CMS POA Indicator Options and Definitions
POA Indicator CodePOA Reason for CodeCMS will pay the CC/MCC DRG?
YDiagnosis was present at time of inpatient admission.YES
NDiagnosis was not present at time of inpatient admission.NO
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.NO
WClinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.YES
1Unreported/Not used - Exempt from POA reporting. NO

Convert Z18.33 to ICD-9

  • V90.33 - Retained wood fragments

Code Classification

  • Factors influencing health status and contact with health services (Z00–Z99)
    • Retained foreign body fragments (Z18)
      • Retained foreign body fragments (Z18)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients

Foreign Bodies

If you've ever gotten a splinter or had sand in your eye, you've had experience with a foreign body. A foreign body is something that is stuck inside you but isn't supposed to be there. You may inhale or swallow a foreign body, or you may get one from an injury to almost any part of your body. Foreign bodies are more common in small children, who sometimes stick things in their mouths, ears, and noses.

Some foreign bodies, like a small splinter, do not cause serious harm. Inhaled or swallowed foreign bodies may cause choking or bowel obstruction and may require medical care.

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