2027 ICD-10-CM Diagnosis Code Z18.10Retained metal fragments, unspecified

ICD-10-CM Codes›Z00–Z99›Z18›Z18

ICD-10-CM Z18.10
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Z18.10 is a billable ICD-10-CM diagnosis code for retained metal fragments, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 951. The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified status.

Code Identity

ICD-10-CM Code
Z18.10
Billable Status
Yes — Valid for Submission
Code Describes
Retained metal fragments, unspecified
Short Description
Retained metal fragments, unspecified
Same as the full description in the CMS dataset.
Parent Code
Z18.1
Retained metal fragments

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ18Retained foreign body fragments
CategoryZ18Retained foreign body fragments
This CodeZ18.10Retained metal fragments, unspecified

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z18.10.

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.

Present on Admission (POA)Billing

Z18.10 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Retained foreign body fragments (Z18).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Ear ring embedded in ear lobe
  • Fishing hook foreign body
  • Fishing hook in abdomen
  • Fishing hook in ankle
  • Fishing hook in anterior region of neck
  • Fishing hook in axilla
  • Fishing hook in back
  • Fishing hook in buttock
  • Fishing hook in calf
  • Fishing hook in cheek
  • Fishing hook in chest
  • Fishing hook in dorsum of foot
  • Fishing hook in dorsum of hand
  • Fishing hook in ear region
  • Fishing hook in eye region
  • Fishing hook in face
  • Fishing hook in foot
  • Fishing hook in forehead
  • Fishing hook in genitalia
  • Fishing hook in great toe
  • Fishing hook in groin
  • Fishing hook in hand
  • Fishing hook in head
  • Fishing hook in head and neck
  • Fishing hook in heel
  • Fishing hook in hip
  • Fishing hook in knee
  • Fishing hook in lip
  • Fishing hook in lower leg
  • Fishing hook in mouth
  • Fishing hook in neck
  • Fishing hook in palm of hand
  • Fishing hook in perineum
  • Fishing hook in pharynx
  • Fishing hook in scalp
  • Fishing hook in shin
  • Fishing hook in shoulder
  • Fishing hook in sole of foot
  • Fishing hook in thigh
  • Fishing hook in thumb
  • Fishing hook in toe
  • Fishing hook in trunk
  • Fishing hook in wrist
  • Foreign body dermatosis
  • Foreign body in auricle
  • Foreign body in heel
  • Foreign body in lip
  • Foreign body of cheek
  • Foreign body of dorsum of foot
  • Foreign body of forehead
  • Foreign body of palm of hand
  • Metal foreign body in abdomen
  • Metal foreign body in ankle
  • Metal foreign body in anterior region of neck
  • Metal foreign body in axilla
  • Metal foreign body in back
  • Metal foreign body in breast
  • Metal foreign body in buttock
  • Metal foreign body in calf
  • Metal foreign body in cheek
  • Metal foreign body in chest
  • Metal foreign body in dorsum of foot
  • Metal foreign body in dorsum of hand
  • Metal foreign body in ear region
  • Metal foreign body in elbow
  • Metal foreign body in eye region
  • Metal foreign body in foot
  • Metal foreign body in forehead
  • Metal foreign body in genitalia
  • Metal foreign body in great toe
  • Metal foreign body in groin
  • Metal foreign body in hand
  • Metal foreign body in head
  • Metal foreign body in head and neck
  • Metal foreign body in head and/or neck
  • Metal foreign body in heel
  • Metal foreign body in hip
  • Metal foreign body in knee
  • Metal foreign body in lip
  • Metal foreign body in lower leg
  • Metal foreign body in mouth
  • Metal foreign body in neck
  • Metal foreign body in palm of hand
  • Metal foreign body in perineum
  • Metal foreign body in pharynx
  • Metal foreign body in scalp
  • Metal foreign body in shin
  • Metal foreign body in shoulder
  • Metal foreign body in sole of foot
  • Metal foreign body in thigh
  • Metal foreign body in thumb
  • Metal foreign body in toe
  • Metal foreign body in trunk
  • Metal foreign body in wrist
  • Reaction to metallic ring, stud and/or infibulata in skin
  • Retained metal fragment foreign body
  • Separated endodontic instrument in root canal of tooth
  • Superficial metal foreign body
  • Zirconium granuloma of skin

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Z18.10: its own notes plus those printed at Z18.1, Z18, and Chapter 21. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Z18 Retained foreign body fragments applies to 14 codes
  • embedded fragment (status)
  • embedded splinter (status)
  • retained foreign body status

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Retained metal fragment NOS

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Z18.1 Retained metal fragments applies to 3 codes
From Z18 Retained foreign body fragments applies to 14 codes
  • 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

Notes

General instructions on how these codes are used.

From Chapter 21 (Z00-Z99) Factors influencing health status and contact with health services applies to 1,425 codes
  • Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
  • (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
  • (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name Z18.10, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming Z18.10: they are not reported together with it, unless the two conditions are unrelated.

  • Z03.82 Encounter for observation for suspected foreign body ruled out
    retained foreign body (Z18.-) names Z18.-, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming Z18.10: its condition is not part of those codes, and both may be reported when the patient has both.

  • Z77 Other contact with and (suspected) exposures hazardous to health
    retained foreign body (Z18.-) names Z18.-, which includes this code

Use Additional Code 10

These codes say to use an additional code from the note, and Z18.10 is one of the codes named.

  • H02.81 Retained foreign body in eyelid
    code to identify the type of retained foreign body (Z18.-) names Z18.-, which includes this code
  • H05.5 Retained (old) foreign body following penetrating wound of orbit
    code to identify the type of retained foreign body (Z18.-) names Z18.-, which includes this code
  • L92.3 Foreign body granuloma of the skin and subcutaneous tissue
    code to identify the type of retained foreign body (Z18.-) names Z18.-, which includes this code
  • M60.2 Foreign body granuloma of soft tissue, not elsewhere classified
    code to identify the type of retained foreign body (Z18.-) names Z18.-, which includes this code
  • R78 Findings of drugs and other substances, not normally found in blood
    code to identify any retained foreign body, if applicable (Z18.-) names Z18.-, which includes this code
  • R79 Other abnormal findings of blood chemistry
    code to identify any retained foreign body, if applicable (Z18.-) names Z18.-, which includes this code
  • R82 Other and unspecified abnormal findings in urine
    code to identify any retained foreign body, if applicable (Z18.-) names Z18.-, which includes this code
  • Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes
    code to identify any retained foreign body, if applicable (Z18.-) names Z18.-, which includes this code
  • Block T51-T65 Toxic effects of substances chiefly nonmedicinal as to source
    to identify any retained foreign body, if applicable (Z18.-) names Z18.-, which includes this code
  • H44.7 Retained (old) intraocular foreign body, nonmagnetic
    code to identify nonmagnetic foreign body (Z18.01-Z18.10, Z18.12, Z18.2-Z18.9) names Z18.01-Z18.10, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR FAC025
Other specified status
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Z18.10 to ICD-9-CMHistory

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

ICD-9-CM
V90.10 Retained metal frag NOS
Exact Match The mapping is direct, with no qualifiers.

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 Z18.10Overview

What is the ICD-10 code for retained metal fragments, unspecified?

The ICD-10-CM code for retained metal fragments, unspecified is Z18.10 (sometimes written as Z1810). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Z18.10 (Retained metal fragments) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report retained metal fragments, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Z18.10 group to?

On inpatient claims, retained metal fragments, unspecified maps to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.5574. Higher weights mean higher Medicare reimbursement.

Can Z18.10 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because retained metal fragments, unspecified describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z18.10 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 retained metal fragments, unspecified on inpatient claims. The code appears in the Retained foreign body fragments (Z18) range of the CMS exempt list.