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Z18.33

✓ Billable

Retained wood fragments

Factors influencing health status and contact with health services (Z00-Z99)

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❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

Z18
  • • artificial joint prosthesis status (Z96.6-)
  • • foreign body accidentally left during a procedure (T81.5-)
  • • foreign body entering through orifice (T15-T19)
  • • in situ cardiac device (Z95.-)
  • • organ or tissue replaced by means other than transplant (Z96.-, Z97.-)
  • • organ or tissue replaced by transplant (Z94.-)
  • • personal history of retained foreign body fully removed Z87.821
  • • superficial foreign body (non-embedded splinter) - code to superficial foreign body, by site

Clinical Description

ICD-10-CM code Z18.33 represents retained wood fragments. This code falls under the Factors influencing health status and contact with health services (Z00-Z99) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.

This is a 6-character code at the 5th level of specificity. This is the most specific code available in this subcategory. Coders should note that Z18.33 has 8 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code Z18.33?

ICD-10-CM code Z18.33 is "Retained wood fragments". It belongs to the category: Factors influencing health status and contact with health services (Z00-Z99).

Is Z18.33 a billable ICD-10 code?

Yes, Z18.33 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

What codes are excluded with Z18.33?

Z18.33 has 8 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Related Codes in Z18.3

Other codes in the same category that may be relevant for differential coding:

Z18.31Retained animal quills or spinesZ18.32Retained toothZ18.39Other retained organic fragments

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Code Information

CodeZ18.33
BillableYes
ParentZ18.3
CategoryFactors influencing health status and contact with health services (Z00-Z99)
Excludes18 rule(s)
Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)