2027 ICD-10-CM Diagnosis Code Z57.9Occupational exposure to unspecified risk factor
Z57.9 is a billable ICD-10-CM diagnosis code for occupational exposure to unspecified risk factor. 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 Socioeconomic/psychosocial factors.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for Z57.9.
Present on Admission (POA)Billing
Z57.9 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Persons with potential health hazards related to socioeconomic and psychosocial circumstances (Z55-Z65).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Allergic contact sensitization of skin and skin-associated mucous membrane
- Allergic contact urticaria
- Allergic sensitization
- Cheese-makers' asthma
- Condition caused by work
- Condition made worse by work
- Contact urticaria
- Disorder due to work-related activity accident
- Exacerbation of constitutional dermatitis due to occupation
- Exacerbation of constitutional dermatitis due to occupational exposure to contact allergen
- Non-melanin pigmentation caused by exogenous substance
- Occupational abrasion of tooth
- Occupational allergic contact sensitization
- Occupational allergic contact urticaria
- Occupational asthma
- Occupational bronchitis
- Occupational cancer of skin
- Occupational contact dermatitis
- Occupational contact dermatitis of hand
- Occupational contact urticaria
- Occupational cutaneous vascular disorder
- Occupational deafness
- Occupational disorder of upper limb
- Occupational dystonia
- Occupational exposure to risk factor
- Occupational injury
- Occupational lung disease
- Occupational non-allergic contact urticaria
- Occupational non-melanin pigmentation due to exogenous substance
- Occupational pleuroparenchymal fibroelastosis
- Occupational protein contact dermatitis
- Occupational tattoo
- Occupationally-acquired disorder of skin pigmentation
- Pleuroparenchymal fibroelastosis
- Protein contact dermatitis
- Secondary pleuroparenchymal fibroelastosis
- Tattoo of skin
- Traumatic deafness
- Traumatic deafness, occupational
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Z57.9: its own notes plus those printed at Chapter 21. A note printed at a category, block or chapter applies to every code under it.
Notes
General instructions on how these codes are used.
- 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 Z57.9, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming Z57.9: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 4
These codes carry an Excludes2 note naming Z57.9: its condition is not part of those codes, and both may be reported when the patient has both.
- Z56 Problems related to employment and unemploymentoccupational exposure to risk factors (Z57.-) names Z57.-, which includes this code
- Z58 Problems related to physical environmentoccupational exposure (Z57.-) names Z57.-, which includes this code
- Z77 Other contact with and (suspected) exposures hazardous to healthoccupational exposure to risk factors (Z57.-) names Z57.-, which includes this code
- Z91 Personal risk factors, not elsewhere classifiedoccupational exposure to risk factors (Z57.-) names Z57.-, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Exposure (to) See Also: Contact, with; T75.89
risk factors Z57.9
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index; each main term links to its index entry.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Occupational Health
Occupational health problems occur at work or because of the kind of work you do. These problems can include:
Read the full article at MedlinePlus
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Convert Z57.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z57.9Overview
What is the ICD-10 code for occupational exposure to unspecified risk factor?
The ICD-10-CM code for occupational exposure to unspecified risk factor is Z57.9 (sometimes written as Z579). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Z57.9 (Occupational exposure to risk factors) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report occupational exposure to unspecified risk factor on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Z57.9 group to?
On inpatient claims, occupational exposure to unspecified risk factor 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 Z57.9 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because occupational exposure to unspecified risk factor describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Is Z57.9 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 occupational exposure to unspecified risk factor on inpatient claims. The code appears in the Persons with potential health hazards related to socioeconomic and psychosocial circumstances (Z55-Z65) range of the CMS exempt list.
